merge(W3): product clarity and coherence

End the AI dead-end — onboarding gains a skippable provider card and the
Coach/Insights/Briefing surfaces explain what the AI does and why a
provider is needed instead of a bare error. Extract buildDashboardBands
so band/target math is one server-side source the page fallback reuses.
Surface Rest Mode on the score card, restore the module-hub intro, link
the glucose panel to Labs, and route the remaining day-key copies through
the canonical helper.

messages/de.json

@@ -414,7 +414,7 @@
   },
   "measurements": {
     "title": "Messungen",
-    "subtitle": "Gewicht, Blutdruck, Puls und mehr",
+    "subtitle": "Werte erfassen und die vollständige Historie einsehen. Trends und Auswertungen findest du unter Auswertungen.",
     "addMeasurement": "Hinzufügen",
     "editMeasurement": "Messwert bearbeiten",
     "type": "Typ",
@@ -1892,7 +1892,8 @@
     "bmiEmptyAction": "Account-Einstellungen öffnen",
     "noAnalysisYet": "Noch keine Einschätzung vorhanden.",
     "assessmentPreparing": "Einschätzung wird vorbereitet…",
-    "noProviderConfigured": "Einschätzung nicht verfügbar.",
+    "noProviderConfigured": "Verbinde einen KI-Anbieter, um hier eine Einschätzung zu deinen Werten zu sehen.",
+    "noProviderAction": "Zu den KI-Einstellungen",
     "startAnalysis": "Einschätzung starten",
     "refreshAnalysis": "Einschätzung aktualisieren",
     "keyTakeaway": "Das Wichtigste",
@@ -1965,6 +1966,7 @@
       "progressAria": "Gesundheitsscore-Fortschritt",
       "deltaVsLastWeek": "{delta} im Vergleich zur Vorwoche",
       "deltaUnavailable": "Noch keine Historie — schau nächste Woche wieder vorbei.",
+      "restModePaused": "Während einer Krankheitsphase pausiert — dein Score wird heute nicht bewertet.",
       "componentBp": "Blutdruck",
       "componentWeight": "Gewicht",
       "componentMood": "Stimmung",
@@ -2007,7 +2009,7 @@
       "emptyAction": "Briefing erstellen",
       "loadingLabel": "Briefing wird zusammengestellt",
       "noProviderTitle": "Kein KI-Anbieter verbunden",
-      "noProviderDescription": "Verbinde einen KI-Anbieter in den Einstellungen, um tägliche Briefings zu erhalten.",
+      "noProviderDescription": "Das Tagesbriefing fasst deine Werte in Klartext zusammen. Dafür braucht HealthLog einen KI-Anbieter — nutze deinen eigenen Schlüssel (OpenAI, Anthropic) oder ein lokales Modell. Deine Daten bleiben dabei bei dir.",
       "noProviderAction": "Zu den KI-Einstellungen"
     },
     "trendsRow": {
@@ -2072,6 +2074,8 @@
       "refusalInjection": "In deiner Nachricht stehen Anweisungen, die meine Vorgaben überschreiben sollen. Ich bin der HealthLog-Coach und fasse ausschließlich deine eigenen Gesundheitsdaten zusammen — formuliere deine Frage bitte in diesem Rahmen neu.",
       "errorBudget": "Du hast das heutige Coach-Limit erreicht. Das Budget setzt sich um Mitternacht (UTC) zurück.",
       "errorProvider": "Der Coach konnte gerade keinen Auswertungs-Anbieter erreichen. Bitte versuche es in einem Moment erneut.",
+      "errorNoProvider": "Der Coach liest deine erfassten Gesundheitsdaten und beantwortet Fragen dazu (keine medizinische Beratung). Dafür braucht HealthLog einen KI-Anbieter — verbinde deinen eigenen Schlüssel oder ein lokales Modell.",
+      "errorNoProviderAction": "KI-Anbieter verbinden",
       "errorNetwork": "Keine Internetverbindung — versuche es erneut, sobald du online bist.",
       "prefsSaveError": "Coach-Einstellungen konnten nicht gespeichert werden. Bitte versuche es erneut.",
       "errorCredentialExpired": "Deine Verbindung zum KI-Anbieter ist abgelaufen. Stelle sie in den Einstellungen wieder her, damit der Coach weiterläuft.",
@@ -2709,6 +2713,7 @@
         "title": "Glukose-Überblick",
         "subtitle": "Ein Blick auf deine letzten {days} Tage, aus {count} Messungen.",
         "spotCaveat": "Das sind Schätzungen aus einzelnen Stichproben-Messungen, kein Profil eines kontinuierlichen Sensors – lies sie als Richtung, nicht als klinisches Urteil.",
+        "labsLink": "Laborergebnisse? HbA1c und Nüchternglukose aus einer Blutabnahme trägst du unter Labor ein.",
         "learningTitle": "Lerne deine Glukose noch kennen",
         "learningBody": "Bisher sind das {count} über {days}. Mit etwas mehr Verlauf wird das Bild klarer – mess weiter oder lass es ein verbundenes Gerät ergänzen.",
         "learningBodyEmpty": "Sobald ein paar Messungen vorliegen – von dir erfasst oder von einem Gerät synchronisiert – nehmen Zeit-im-Zielbereich, Durchschnitt und Schwankung hier Gestalt an.",
@@ -3623,7 +3628,10 @@
       "learning": "Manche Einblicke – Glukose, Schlafrhythmus, Blutdrucktrends, Zyklus – schärfen sich in den ersten ein bis zwei Wochen, sobald sich deine Daten ansammeln. Leere Kacheln heißen jetzt nur, dass wir deine Basislinie noch lernen.",
       "connectCta": "Gerät verbinden",
       "logCta": "Ersten Wert eintragen",
-      "importCta": "Bestehende Daten importieren"
+      "importCta": "Bestehende Daten importieren",
+      "aiTitle": "KI-Einblicke aktivieren (optional)",
+      "aiBody": "Coach, Tagesbriefing und Einschätzungen fassen deine Werte in Klartext zusammen. Dafür verbindest du deinen eigenen KI-Schlüssel (OpenAI, Anthropic) oder ein lokales Modell — deine Daten bleiben bei dir.",
+      "aiCta": "KI-Anbieter verbinden"
     },
     "welcomeBack": {
       "title": "Willkommen zurück",

messages/en.json

@@ -414,7 +414,7 @@
   },
   "measurements": {
     "title": "Measurements",
-    "subtitle": "Weight, blood pressure, pulse and more",
+    "subtitle": "Log readings and browse the full history. Trends and analysis live under Insights.",
     "addMeasurement": "Add",
     "editMeasurement": "Edit measurement",
     "type": "Type",
@@ -1892,7 +1892,8 @@
     "bmiEmptyTitle": "Set your height to see BMI",
     "bmiEmptyDescription": "BMI needs your height. Add it under Settings → Account.",
     "bmiEmptyAction": "Open account settings",
-    "noProviderConfigured": "Assessment unavailable.",
+    "noProviderConfigured": "Connect an AI provider to see an assessment of your readings here.",
+    "noProviderAction": "Open AI settings",
     "startAnalysis": "Start assessment",
     "refreshAnalysis": "Refresh assessment",
     "keyTakeaway": "Key Takeaway",
@@ -1965,6 +1966,7 @@
       "progressAria": "Health Score progress",
       "deltaVsLastWeek": "{delta} vs last week",
       "deltaUnavailable": "No history yet — check back next week.",
+      "restModePaused": "Paused during illness — your score isn't being judged today.",
       "componentBp": "BP",
       "componentWeight": "Weight",
       "componentMood": "Mood",
@@ -2007,7 +2009,7 @@
       "emptyAction": "Generate briefing",
       "loadingLabel": "Synthesising today's briefing",
       "noProviderTitle": "No AI provider connected",
-      "noProviderDescription": "Connect an AI provider in settings to receive daily briefings.",
+      "noProviderDescription": "The daily briefing turns your readings into plain-language summary. HealthLog needs an AI provider for that — use your own key (OpenAI, Anthropic) or a local model. Your data stays with you.",
       "noProviderAction": "Open AI settings"
     },
     "trendsRow": {
@@ -2072,6 +2074,8 @@
       "refusalInjection": "I noticed wording that tries to override my instructions. I am the HealthLog Coach and only summarise your own health data — please rephrase your question in those terms.",
       "errorBudget": "You've reached today's Coach usage limit. The budget refreshes at midnight UTC.",
       "errorProvider": "The Coach could not reach an Insights provider just now. Please try again in a moment.",
+      "errorNoProvider": "The Coach reads your logged health data and answers questions about it (not medical advice). HealthLog needs an AI provider for that — connect your own key or a local model.",
+      "errorNoProviderAction": "Connect an AI provider",
       "errorNetwork": "No internet connection — try again once you're back online.",
       "prefsSaveError": "Couldn't save your Coach preferences. Please try again.",
       "errorCredentialExpired": "Your AI provider connection has expired. Reconnect it in Settings to keep the Coach running.",
@@ -2709,6 +2713,7 @@
         "title": "Glucose overview",
         "subtitle": "A read on your last {days} days, from {count} readings.",
         "spotCaveat": "These are spot-reading estimates from individual measurements, not a continuous-monitor profile — read them as a direction of travel rather than a clinical verdict.",
+        "labsLink": "Lab results? Log a blood-draw HbA1c or fasting glucose under Labs.",
         "learningTitle": "Still learning your glucose",
         "learningBody": "So far that's {count} over {days}. A little more history and a fuller picture comes into focus — keep logging, or let a connected device fill it in.",
         "learningBodyEmpty": "Once a handful of readings come in — logged by you or synced from a device — your time-in-range, average, and variability take shape here.",
@@ -3623,7 +3628,10 @@
       "learning": "Some insights — glucose, sleep rhythm, blood-pressure trends, cycle — sharpen over the first week or two as your data builds up. Empty tiles now just mean we're still learning your baseline.",
       "connectCta": "Connect a device",
       "logCta": "Log your first measurement",
-      "importCta": "Import existing history"
+      "importCta": "Import existing history",
+      "aiTitle": "Turn on AI Insights (optional)",
+      "aiBody": "Coach, the daily briefing and assessments turn your readings into plain language. For that you connect your own AI key (OpenAI, Anthropic) or a local model — your data stays with you.",
+      "aiCta": "Connect an AI provider"
     },
     "welcomeBack": {
       "title": "Welcome back",

messages/es.json

@@ -414,7 +414,7 @@
   },
   "measurements": {
     "title": "Mediciones",
-    "subtitle": "Peso, tensión arterial, pulso y más",
+    "subtitle": "Registra lecturas y consulta el historial completo. Las tendencias y los análisis están en Análisis.",
     "addMeasurement": "Añadir",
     "editMeasurement": "Editar medición",
     "type": "Tipo",
@@ -1892,7 +1892,8 @@
     "bmiEmptyTitle": "Añade tu altura para calcular el IMC",
     "bmiEmptyDescription": "El IMC necesita tu altura. Guárdala en Ajustes → Cuenta.",
     "bmiEmptyAction": "Abrir ajustes de cuenta",
-    "noProviderConfigured": "Valoración no disponible.",
+    "noProviderConfigured": "Conecta un proveedor de IA para ver aquí una valoración de tus lecturas.",
+    "noProviderAction": "Abrir ajustes de IA",
     "startAnalysis": "Iniciar valoración",
     "refreshAnalysis": "Actualizar valoración",
     "keyTakeaway": "Lo más importante",
@@ -1965,6 +1966,7 @@
       "progressAria": "Progreso de la puntuación de salud",
       "deltaVsLastWeek": "{delta} respecto a la semana anterior",
       "deltaUnavailable": "Aún no hay historial — vuelve la semana que viene.",
+      "restModePaused": "En pausa durante la enfermedad — hoy tu puntuación no se evalúa.",
       "componentBp": "PA",
       "componentWeight": "Peso",
       "componentMood": "Estado de ánimo",
@@ -2007,7 +2009,7 @@
       "emptyAction": "Generar resumen",
       "loadingLabel": "Preparando el resumen",
       "noProviderTitle": "Ningún proveedor de IA conectado",
-      "noProviderDescription": "Conecta un proveedor de IA en los ajustes para recibir resúmenes diarios.",
+      "noProviderDescription": "El briefing diario resume tus lecturas en lenguaje claro. HealthLog necesita un proveedor de IA para ello: usa tu propia clave (OpenAI, Anthropic) o un modelo local. Tus datos siguen siendo tuyos.",
       "noProviderAction": "Abrir ajustes de IA"
     },
     "trendsRow": {
@@ -2072,6 +2074,8 @@
       "refusalInjection": "Tu mensaje contiene instrucciones que pretenden sobrescribir mis indicaciones. Soy el coach de HealthLog y solo resumo tus propios datos de salud — reformula tu pregunta dentro de ese marco.",
       "errorBudget": "Has alcanzado el límite diario del coach. El cupo se reinicia a medianoche (UTC).",
       "errorProvider": "El coach no ha podido contactar con un proveedor de análisis ahora mismo. Inténtalo en un momento.",
+      "errorNoProvider": "El coach lee tus datos de salud registrados y responde preguntas sobre ellos (no es consejo médico). HealthLog necesita un proveedor de IA para ello: conecta tu propia clave o un modelo local.",
+      "errorNoProviderAction": "Conectar un proveedor de IA",
       "errorNetwork": "Sin conexión a Internet — inténtalo de nuevo cuando vuelvas a estar en línea.",
       "prefsSaveError": "No se pudieron guardar tus preferencias del Coach. Inténtalo de nuevo.",
       "errorCredentialExpired": "Tu conexión con el proveedor de IA ha caducado. Vuelve a conectarla en Ajustes para que el Coach siga funcionando.",
@@ -2709,6 +2713,7 @@
         "title": "Resumen de glucosa",
         "subtitle": "Una lectura de tus últimos {days} días, a partir de {count} mediciones.",
         "spotCaveat": "Son estimaciones a partir de mediciones puntuales, no un perfil de un sensor continuo: léelas como una tendencia, no como un veredicto clínico.",
+        "labsLink": "¿Resultados de laboratorio? Registra una HbA1c o glucosa en ayunas de una analítica en Laboratorio.",
         "learningTitle": "Aún conociendo tu glucosa",
         "learningBody": "De momento son {count} en {days}. Con algo más de historial el panorama se aclara: sigue registrando o deja que lo complete un dispositivo conectado.",
         "learningBodyEmpty": "En cuanto lleguen unas cuantas mediciones —registradas por ti o sincronizadas desde un dispositivo— tu tiempo en rango, promedio y variabilidad tomarán forma aquí.",
@@ -3623,7 +3628,10 @@
       "learning": "Algunas conclusiones —glucosa, ritmo de sueño, tendencias de presión arterial, ciclo— se afinan durante la primera semana o dos a medida que se acumulan tus datos. Las casillas vacías ahora solo significan que aún estamos aprendiendo tu línea base.",
       "connectCta": "Conectar un dispositivo",
       "logCta": "Registra tu primera medición",
-      "importCta": "Importar historial existente"
+      "importCta": "Importar historial existente",
+      "aiTitle": "Activar Insights con IA (opcional)",
+      "aiBody": "El coach, el briefing diario y las valoraciones convierten tus lecturas en lenguaje claro. Para ello conectas tu propia clave de IA (OpenAI, Anthropic) o un modelo local: tus datos siguen siendo tuyos.",
+      "aiCta": "Conectar un proveedor de IA"
     },
     "welcomeBack": {
       "title": "Bienvenido de nuevo",

messages/fr.json

@@ -414,7 +414,7 @@
   },
   "measurements": {
     "title": "Mesures",
-    "subtitle": "Poids, tension artérielle, pouls et plus",
+    "subtitle": "Saisis tes mesures et consulte l'historique complet. Les tendances et analyses sont dans Analyses.",
     "addMeasurement": "Ajouter",
     "editMeasurement": "Modifier la mesure",
     "type": "Type",
@@ -1892,7 +1892,8 @@
     "bmiEmptyTitle": "Ajoute ta taille pour l’IMC",
     "bmiEmptyDescription": "L’IMC nécessite ta taille. Renseigne-la dans Paramètres → Compte.",
     "bmiEmptyAction": "Ouvrir les paramètres du compte",
-    "noProviderConfigured": "Évaluation indisponible.",
+    "noProviderConfigured": "Connecte un fournisseur d'IA pour voir ici une évaluation de tes mesures.",
+    "noProviderAction": "Ouvrir les réglages IA",
     "startAnalysis": "Lancer l’évaluation",
     "refreshAnalysis": "Actualiser l’évaluation",
     "keyTakeaway": "L’essentiel",
@@ -1965,6 +1966,7 @@
       "progressAria": "Progression du score de santé",
       "deltaVsLastWeek": "{delta} par rapport à la semaine précédente",
       "deltaUnavailable": "Pas encore d’historique — reviens la semaine prochaine.",
+      "restModePaused": "En pause pendant la maladie — ton score n'est pas évalué aujourd'hui.",
       "componentBp": "TA",
       "componentWeight": "Poids",
       "componentMood": "Humeur",
@@ -2007,7 +2009,7 @@
       "emptyAction": "Générer le briefing",
       "loadingLabel": "Préparation du briefing",
       "noProviderTitle": "Aucun fournisseur d'IA connecté",
-      "noProviderDescription": "Connecte un fournisseur d'IA dans les réglages pour recevoir des briefings quotidiens.",
+      "noProviderDescription": "Le briefing quotidien résume tes mesures en langage clair. HealthLog a besoin d'un fournisseur d'IA pour cela : utilise ta propre clé (OpenAI, Anthropic) ou un modèle local. Tes données restent chez toi.",
       "noProviderAction": "Ouvrir les réglages IA"
     },
     "trendsRow": {
@@ -2072,6 +2074,8 @@
       "refusalInjection": "Ton message contient des instructions qui cherchent à remplacer mes consignes. Je suis le coach HealthLog et je ne résume que tes propres données de santé — reformule ta question dans ce cadre.",
       "errorBudget": "Tu as atteint la limite quotidienne du coach. Le quota se réinitialise à minuit (UTC).",
       "errorProvider": "Le coach n’a pas pu joindre un fournisseur d’analyse maintenant. Réessaie dans un instant.",
+      "errorNoProvider": "Le coach lit tes données de santé enregistrées et répond aux questions à leur sujet (pas un avis médical). HealthLog a besoin d'un fournisseur d'IA pour cela : connecte ta propre clé ou un modèle local.",
+      "errorNoProviderAction": "Connecter un fournisseur d'IA",
       "errorNetwork": "Pas de connexion Internet — réessaie une fois reconnecté.",
       "prefsSaveError": "Impossible d’enregistrer vos préférences du Coach. Réessayez.",
       "errorCredentialExpired": "Ta connexion au fournisseur d'IA a expiré. Reconnecte-la dans les Réglages pour que le Coach continue de fonctionner.",
@@ -2709,6 +2713,7 @@
         "title": "Aperçu du glucose",
         "subtitle": "Un point sur vos {days} derniers jours, à partir de {count} mesures.",
         "spotCaveat": "Ce sont des estimations issues de mesures ponctuelles, pas le profil d’un capteur continu : lisez-les comme une tendance, non comme un verdict clinique.",
+        "labsLink": "Résultats de laboratoire ? Saisis une HbA1c ou une glycémie à jeun issue d'une prise de sang dans Laboratoire.",
         "learningTitle": "Votre glucose se découvre encore",
         "learningBody": "Pour l’instant, cela fait {count} sur {days}. Avec un peu plus d’historique, le tableau se précise : continuez à enregistrer ou laissez un appareil connecté compléter.",
         "learningBodyEmpty": "Dès que quelques mesures arrivent — saisies par vous ou synchronisées depuis un appareil — votre temps dans la cible, votre moyenne et votre variabilité prennent forme ici.",
@@ -3623,7 +3628,10 @@
       "learning": "Certaines analyses — glycémie, rythme de sommeil, tendances de tension, cycle — s'affinent au cours de la première semaine ou deux à mesure que vos données s'accumulent. Des tuiles vides signifient simplement que nous apprenons encore votre référence.",
       "connectCta": "Connecter un appareil",
       "logCta": "Enregistrez votre première mesure",
-      "importCta": "Importer un historique existant"
+      "importCta": "Importer un historique existant",
+      "aiTitle": "Activer les Insights IA (facultatif)",
+      "aiBody": "Le coach, le briefing quotidien et les évaluations traduisent tes mesures en langage clair. Pour cela, connecte ta propre clé IA (OpenAI, Anthropic) ou un modèle local — tes données restent chez toi.",
+      "aiCta": "Connecter un fournisseur d'IA"
     },
     "welcomeBack": {
       "title": "Bon retour",

messages/it.json

@@ -414,7 +414,7 @@
   },
   "measurements": {
     "title": "Misurazioni",
-    "subtitle": "Peso, pressione arteriosa, pulsazioni e altro",
+    "subtitle": "Registra le misurazioni e consulta lo storico completo. Tendenze e analisi sono in Analisi.",
     "addMeasurement": "Aggiungi",
     "editMeasurement": "Modifica misurazione",
     "type": "Tipo",
@@ -1892,7 +1892,8 @@
     "bmiEmptyTitle": "Aggiungi l’altezza per il BMI",
     "bmiEmptyDescription": "Per il BMI serve la tua altezza. Salvala in Impostazioni → Account.",
     "bmiEmptyAction": "Apri impostazioni account",
-    "noProviderConfigured": "Valutazione non disponibile.",
+    "noProviderConfigured": "Collega un provider IA per vedere qui una valutazione delle tue misurazioni.",
+    "noProviderAction": "Apri impostazioni IA",
     "startAnalysis": "Avvia valutazione",
     "refreshAnalysis": "Aggiorna valutazione",
     "keyTakeaway": "Ciò che conta",
@@ -1965,6 +1966,7 @@
       "progressAria": "Avanzamento del punteggio di salute",
       "deltaVsLastWeek": "{delta} rispetto alla settimana scorsa",
       "deltaUnavailable": "Ancora nessuno storico — ripassa la prossima settimana.",
+      "restModePaused": "In pausa durante la malattia — oggi il tuo punteggio non viene valutato.",
       "componentBp": "PA",
       "componentWeight": "Peso",
       "componentMood": "Umore",
@@ -2007,7 +2009,7 @@
       "emptyAction": "Genera briefing",
       "loadingLabel": "Preparazione del briefing",
       "noProviderTitle": "Nessun provider IA collegato",
-      "noProviderDescription": "Collega un provider IA nelle impostazioni per ricevere briefing giornalieri.",
+      "noProviderDescription": "Il briefing giornaliero riassume le tue misurazioni in linguaggio chiaro. HealthLog ha bisogno di un provider IA per questo: usa la tua chiave (OpenAI, Anthropic) o un modello locale. I tuoi dati restano tuoi.",
       "noProviderAction": "Apri impostazioni IA"
     },
     "trendsRow": {
@@ -2072,6 +2074,8 @@
       "refusalInjection": "Nel tuo messaggio ci sono istruzioni che cercano di sovrascrivere le mie indicazioni. Sono il coach di HealthLog e riassumo solo i tuoi dati di salute — riformula la domanda in questo perimetro.",
       "errorBudget": "Hai raggiunto il limite giornaliero del coach. Il budget si reimposta a mezzanotte (UTC).",
       "errorProvider": "Il coach non è riuscito a contattare un provider di analisi ora. Riprova fra poco.",
+      "errorNoProvider": "Il coach legge i tuoi dati di salute registrati e risponde a domande su di essi (non è consulenza medica). HealthLog ha bisogno di un provider IA per questo: collega la tua chiave o un modello locale.",
+      "errorNoProviderAction": "Collega un provider IA",
       "errorNetwork": "Nessuna connessione Internet — riprova quando sei di nuovo online.",
       "prefsSaveError": "Impossibile salvare le preferenze del Coach. Riprova.",
       "errorCredentialExpired": "La connessione al provider di IA è scaduta. Riconnettila nelle Impostazioni per mantenere attivo il Coach.",
@@ -2709,6 +2713,7 @@
         "title": "Panoramica della glicemia",
         "subtitle": "Una lettura dei tuoi ultimi {days} giorni, da {count} misurazioni.",
         "spotCaveat": "Sono stime da singole misurazioni puntuali, non il profilo di un sensore continuo: leggile come una tendenza, non come un verdetto clinico.",
+        "labsLink": "Risultati di laboratorio? Registra una HbA1c o la glicemia a digiuno da un prelievo in Laboratorio.",
         "learningTitle": "Stiamo ancora imparando la tua glicemia",
         "learningBody": "Per ora sono {count} su {days}. Con un po’ più di storico il quadro si chiarisce: continua a registrare o lascia che lo completi un dispositivo connesso.",
         "learningBodyEmpty": "Appena arrivano alcune misurazioni — registrate da te o sincronizzate da un dispositivo — il tempo nel range, la media e la variabilità prendono forma qui.",
@@ -3623,7 +3628,10 @@
       "learning": "Alcune analisi — glicemia, ritmo del sonno, tendenze della pressione, ciclo — si affinano nella prima settimana o due man mano che i tuoi dati si accumulano. Le caselle vuote ora indicano solo che stiamo ancora imparando il tuo riferimento.",
       "connectCta": "Collega un dispositivo",
       "logCta": "Registra la tua prima misurazione",
-      "importCta": "Importa la cronologia esistente"
+      "importCta": "Importa la cronologia esistente",
+      "aiTitle": "Attiva gli Insight IA (facoltativo)",
+      "aiBody": "Il coach, il briefing giornaliero e le valutazioni trasformano le tue misurazioni in linguaggio chiaro. Per farlo colleghi la tua chiave IA (OpenAI, Anthropic) o un modello locale: i tuoi dati restano tuoi.",
+      "aiCta": "Collega un provider IA"
     },
     "welcomeBack": {
       "title": "Bentornato",

messages/pl.json

@@ -414,7 +414,7 @@
   },
   "measurements": {
     "title": "Pomiary",
-    "subtitle": "Waga, ciśnienie tętnicze, tętno i więcej",
+    "subtitle": "Zapisuj pomiary i przeglądaj pełną historię. Trendy i analizy znajdziesz w Analizach.",
     "addMeasurement": "Dodaj",
     "editMeasurement": "Edytuj pomiar",
     "type": "Typ",
@@ -1892,7 +1892,8 @@
     "bmiEmptyTitle": "Dodaj wzrost, aby obliczyć BMI",
     "bmiEmptyDescription": "BMI wymaga twojego wzrostu. Zapisz go w Ustawieniach → Konto.",
     "bmiEmptyAction": "Otwórz ustawienia konta",
-    "noProviderConfigured": "Ocena niedostępna.",
+    "noProviderConfigured": "Połącz dostawcę AI, aby zobaczyć tutaj ocenę swoich pomiarów.",
+    "noProviderAction": "Otwórz ustawienia AI",
     "startAnalysis": "Uruchom ocenę",
     "refreshAnalysis": "Odśwież ocenę",
     "keyTakeaway": "Najważniejsze",
@@ -1965,6 +1966,7 @@
       "progressAria": "Postęp wyniku zdrowia",
       "deltaVsLastWeek": "{delta} w porównaniu z ubiegłym tygodniem",
       "deltaUnavailable": "Brak historii — zajrzyj w przyszłym tygodniu.",
+      "restModePaused": "Wstrzymane podczas choroby — Twój wynik nie jest dziś oceniany.",
       "componentBp": "RR",
       "componentWeight": "Waga",
       "componentMood": "Nastrój",
@@ -2007,7 +2009,7 @@
       "emptyAction": "Wygeneruj briefing",
       "loadingLabel": "Przygotowanie briefingu",
       "noProviderTitle": "Brak połączonego dostawcy AI",
-      "noProviderDescription": "Połącz dostawcę AI w ustawieniach, aby otrzymywać codzienne briefingi.",
+      "noProviderDescription": "Codzienny briefing podsumowuje Twoje pomiary prostym językiem. HealthLog potrzebuje do tego dostawcy AI — użyj własnego klucza (OpenAI, Anthropic) lub modelu lokalnego. Twoje dane pozostają u Ciebie.",
       "noProviderAction": "Otwórz ustawienia AI"
     },
     "trendsRow": {
@@ -2072,6 +2074,8 @@
       "refusalInjection": "Twoja wiadomość zawiera instrukcje, które próbują nadpisać moje wytyczne. Jestem coachem HealthLog i podsumowuję wyłącznie twoje własne dane zdrowotne — przeformułuj pytanie w tych ramach.",
       "errorBudget": "Osiągnięto dzienny limit coacha. Limit resetuje się o północy (UTC).",
       "errorProvider": "Coach nie mógł teraz skontaktować się z dostawcą analizy. Spróbuj za chwilę.",
+      "errorNoProvider": "Coach czyta Twoje zapisane dane zdrowotne i odpowiada na pytania o nie (to nie porada medyczna). HealthLog potrzebuje do tego dostawcy AI — połącz własny klucz lub model lokalny.",
+      "errorNoProviderAction": "Połącz dostawcę AI",
       "errorNetwork": "Brak połączenia z Internetem — spróbuj ponownie, gdy wrócisz online.",
       "prefsSaveError": "Nie udało się zapisać ustawień Coacha. Spróbuj ponownie.",
       "errorCredentialExpired": "Połączenie z dostawcą AI wygasło. Połącz je ponownie w Ustawieniach, aby Coach działał dalej.",
@@ -2709,6 +2713,7 @@
         "title": "Przegląd glukozy",
         "subtitle": "Spojrzenie na ostatnie {days} dni, na podstawie {count} pomiarów.",
         "spotCaveat": "To szacunki z pojedynczych pomiarów punktowych, a nie profil z czujnika ciągłego — traktuj je jako kierunek, nie jako diagnozę.",
+        "labsLink": "Wyniki laboratoryjne? HbA1c lub glukozę na czczo z pobrania krwi zapisz w sekcji Laboratorium.",
         "learningTitle": "Wciąż poznajemy Twoją glukozę",
         "learningBody": "Na razie to {count} w ciągu {days}. Przy nieco dłuższej historii obraz się wyostrza — rejestruj dalej lub pozwól uzupełnić to podłączonemu urządzeniu.",
         "learningBodyEmpty": "Gdy pojawi się kilka pomiarów — wpisanych przez Ciebie lub zsynchronizowanych z urządzenia — czas w zakresie, średnia i zmienność nabiorą tu kształtu.",
@@ -3623,7 +3628,10 @@
       "learning": "Niektóre wnioski — glukoza, rytm snu, trendy ciśnienia, cykl — wyostrzają się w ciągu pierwszego tygodnia lub dwóch, w miarę gromadzenia danych. Puste kafelki oznaczają teraz tylko, że wciąż poznajemy Twój punkt odniesienia.",
       "connectCta": "Połącz urządzenie",
       "logCta": "Zapisz pierwszy pomiar",
-      "importCta": "Importuj istniejącą historię"
+      "importCta": "Importuj istniejącą historię",
+      "aiTitle": "Włącz Insighty AI (opcjonalnie)",
+      "aiBody": "Coach, codzienny briefing i oceny zamieniają Twoje pomiary w prosty język. W tym celu łączysz własny klucz AI (OpenAI, Anthropic) lub model lokalny — Twoje dane pozostają u Ciebie.",
+      "aiCta": "Połącz dostawcę AI"
     },
     "welcomeBack": {
       "title": "Witaj ponownie",

src/app/page.tsx

@@ -106,18 +106,7 @@ import { isDashboardSnapshotEnabled } from "@/lib/dashboard/snapshot-flag";
 import type { DataSummary } from "@/lib/analytics/trends";
 import { mergeSlimAndThickAnalytics } from "@/lib/analytics/merge-slim-thick";
 import { isWindowSufficient } from "@/lib/analytics/window-confidence";
-import { getBpTargets } from "@/lib/analytics/bp-targets";
-import {
-  buildTrafficLightBands,
-  buildTrafficRange,
-  buildWeightBandsFromHeight,
-  buildWeightRangeFromHeight,
-  getBodyFatTargetRange,
-} from "@/lib/analytics/value-bands";
-import {
-  getAgeFromDateOfBirth,
-  getPersonalizedPulseTarget,
-} from "@/lib/analytics/pulse-targets";
+import { buildDashboardBands } from "@/lib/dashboard/bands";
 import { apiGet } from "@/lib/api/api-fetch";
 
 // v1.18.6 — the pure first-paint / skeleton-reservation gates moved to
@@ -537,34 +526,22 @@ export default function DashboardPage() {
   const serverBands = snapshotEnabled
     ? snapshotQuery.data?.targetBands
     : undefined;
-  const bpTargets = snapshotEnabled
-    ? (serverBands?.bpTargets ?? null)
-    : user?.dateOfBirth != null
-      ? getBpTargets(new Date(user.dateOfBirth))
-      : null;
-  const bodyFatRange = snapshotEnabled
-    ? (serverBands?.bodyFatRange ?? getBodyFatTargetRange(user?.gender))
-    : getBodyFatTargetRange(user?.gender);
-  const weightRange = snapshotEnabled
-    ? (serverBands?.weightRange ?? null)
-    : user?.heightCm
-      ? buildWeightRangeFromHeight(user.heightCm)
-      : null;
-  const weightBands = snapshotEnabled
-    ? (serverBands?.weightBands ?? undefined)
-    : user?.heightCm
-      ? buildWeightBandsFromHeight(user.heightCm, {
-          lowerBound: 30,
-          upperBound: 250,
-        })
-      : undefined;
-  // The pulse target range / bands carry no i18n — read them server-side
-  // under snapshot mode; recompute from the profile otherwise.
-  const pulseAge = getAgeFromDateOfBirth(user?.dateOfBirth ?? null);
-  const pulseTarget = getPersonalizedPulseTarget(
-    pulseAge,
-    (user?.gender as "MALE" | "FEMALE" | null | undefined) ?? null,
-  );
+  // Resolve the bands through the SAME `buildDashboardBands` helper the
+  // server snapshot uses, so the snapshot path and the client fallback
+  // are byte-identical by construction (no second inline copy of the
+  // band math to drift). Always compute the client copy from the profile
+  // — it is pure + cheap — so a still-loading snapshot frame keeps real
+  // bands rather than blank charts; `serverBands ?? clientBands` then
+  // prefers the authoritative server numbers the moment they arrive.
+  const clientBands = buildDashboardBands({
+    dateOfBirth: user?.dateOfBirth ? new Date(user.dateOfBirth) : null,
+    gender: (user?.gender as "MALE" | "FEMALE" | null | undefined) ?? null,
+    heightCm: user?.heightCm ?? null,
+  });
+  const bands = serverBands ?? clientBands;
+  const bpTargets = bands.bpTargets;
+  const weightRange = bands.weightRange;
+  const weightBands = bands.weightBands ?? undefined;
   const bpTargetZones = bpTargets
     ? [
         {
@@ -587,50 +564,11 @@ export default function DashboardPage() {
         },
       ]
     : undefined;
-  const bpSysRange = snapshotEnabled
-    ? (serverBands?.bpSysRange ?? null)
-    : bpTargets
-      ? buildTrafficRange(bpTargets.sysLow, bpTargets.sysHigh)
-      : null;
-  const bpDiaRange = snapshotEnabled
-    ? (serverBands?.bpDiaRange ?? null)
-    : bpTargets
-      ? buildTrafficRange(bpTargets.diaLow, bpTargets.diaHigh)
-      : null;
-  const pulseDisplayRange = serverBands?.pulseDisplayRange ?? {
-    greenMin: pulseTarget.greenMin,
-    greenMax: pulseTarget.greenMax,
-    orangeMin: pulseTarget.orangeMin,
-    orangeMax: pulseTarget.orangeMax,
-  };
-  const pulseBands = serverBands?.pulseBands ?? [
-    { min: 30, max: pulseTarget.orangeMin, color: "#ff5555", opacity: 0.16 },
-    {
-      min: pulseTarget.orangeMin,
-      max: pulseTarget.greenMin,
-      color: "#ffb86c",
-      opacity: 0.18,
-    },
-    {
-      min: pulseTarget.greenMin,
-      max: pulseTarget.greenMax,
-      color: "#50fa7b",
-      opacity: 0.2,
-    },
-    {
-      min: pulseTarget.greenMax,
-      max: pulseTarget.orangeMax,
-      color: "#ffb86c",
-      opacity: 0.18,
-    },
-    { min: pulseTarget.orangeMax, max: 220, color: "#ff5555", opacity: 0.16 },
-  ].filter((band) => band.max > band.min);
-  const bodyFatBands =
-    serverBands?.bodyFatBands ??
-    buildTrafficLightBands(bodyFatRange.min, bodyFatRange.max, {
-      lowerBound: 2,
-      upperBound: 55,
-    });
+  const bpSysRange = bands.bpSysRange;
+  const bpDiaRange = bands.bpDiaRange;
+  const pulseDisplayRange = bands.pulseDisplayRange;
+  const pulseBands = bands.pulseBands;
+  const bodyFatBands = bands.bodyFatBands;
 
   // v1.18.6 — ONE batched fetch for every visible non-sleep chart series
   // (audit finding #2). Pre-fix, each `<HealthChart>` fired its own

src/components/insights/__tests__/insight-status-card.test.tsx

@@ -80,7 +80,11 @@ describe("<InsightStatusCard>", () => {
         text="ignored when hasProvider is false"
       />,
     );
-    expect(html).toContain("Assessment unavailable.");
+    // v1.18.6 — the no-provider tile is a guided-setup explainer + a
+    // Settings link, not a bare "unavailable" line.
+    expect(html).toContain("Connect an AI provider");
+    expect(html).toContain("Open AI settings");
+    expect(html).toContain("/settings/ai");
     expect(html).not.toContain("ignored when hasProvider is false");
   });
 

src/components/insights/coach-panel/__tests__/message-thread.test.tsx

@@ -662,13 +662,20 @@ describe("errorCodeToI18nKey", () => {
     for (const code of [
       "coach.provider.unavailable",
       "coach.provider.empty",
-      "coach.provider.none",
       "coach.stream",
     ]) {
       expect(errorCodeToI18nKey(code)).toBe("insights.coach.errorProvider");
     }
   });
 
+  // v1.18.6 — a "no provider configured anywhere" turn is a setup gap,
+  // not a transient failure, so it carries its own guided-setup copy.
+  it("maps the no-provider case to its dedicated guided-setup copy", () => {
+    expect(errorCodeToI18nKey("coach.provider.none")).toBe(
+      "insights.coach.errorNoProvider",
+    );
+  });
+
   // v1.4.43 QoL (M6) — `coach.network` no longer collapses to the
   // generic provider copy; the user needs the actionable offline hint.
   it("maps coach.network to the dedicated offline key", () => {

src/components/insights/coach-panel/message-thread.tsx

@@ -1,6 +1,7 @@
 "use client";
 
 import { Fragment, useEffect, useId, useMemo, useRef, useState } from "react";
+import Link from "next/link";
 import { useMutation } from "@tanstack/react-query";
 import { toast } from "sonner";
 import {
@@ -168,9 +169,14 @@ export function errorCodeToI18nKey(code: string): string {
       // (auth-class failure). The next action is "reconnect", not "try
       // again later", so it carries its own copy pointing at Settings.
       return "insights.coach.errorCredentialExpired";
+    case "coach.provider.none":
+      // v1.18.6 — no AI provider is configured anywhere, so "try again
+      // in a moment" is the wrong instruction (it will 422 forever). Send
+      // the user to guided setup with a one-line explainer + a Settings
+      // link rendered alongside the bubble copy.
+      return "insights.coach.errorNoProvider";
     case "coach.provider.unavailable":
     case "coach.provider.empty":
-    case "coach.provider.none":
     case "coach.stream":
       return "insights.coach.errorProvider";
     default:
@@ -613,6 +619,19 @@ function ChatBubble({
         {safeError && content && (
           <p className="text-warning/90 text-xs">{safeError}</p>
         )}
+        {/* v1.18.6 — a "no provider configured anywhere" turn is a
+            setup gap, not a transient failure: surface a direct link to
+            Settings → AI so the Coach guides the user into BYOK / local
+            setup instead of inviting an endless retry. */}
+        {errorCode === "coach.provider.none" && (
+          <Link
+            href="/settings/ai"
+            data-slot="coach-no-provider-cta"
+            className="text-primary text-xs font-medium underline-offset-4 hover:underline"
+          >
+            {t("insights.coach.errorNoProviderAction")}
+          </Link>
+        )}
         {/* v1.12.0 — collapse the whole provenance block ("what was
             included") behind one disclosure, collapsed by default. The
             source chips used to render fully expanded above the

src/components/insights/glucose/glucose-clinical-panel.tsx

@@ -1,6 +1,7 @@
 "use client";
 
-import { Activity, Droplet, TrendingUp } from "lucide-react";
+import Link from "next/link";
+import { Activity, Droplet, FlaskConical, TrendingUp } from "lucide-react";
 
 import { Badge } from "@/components/ui/badge";
 import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
@@ -113,6 +114,9 @@ export function GlucoseClinicalPanel() {
             }
             caveat={t("insights.bloodGlucose.clinical.spotCaveat")}
           />
+          <div className="mt-4">
+            <LabsCrossLink />
+          </div>
         </CardContent>
       </Card>
     );
@@ -225,11 +229,34 @@ export function GlucoseClinicalPanel() {
             byContext={byContext}
           />
         ) : null}
+
+        <LabsCrossLink />
       </CardContent>
     </Card>
   );
 }
 
+/**
+ * v1.18.6 — signpost the measurement-vs-lab mental model. This panel
+ * estimates A1c / GMI from spot or CGM readings over time; a lab-ordered
+ * HbA1c or fasting-glucose result is a dated panel value that lives under
+ * Labs. The cross-link keeps the two surfaces referencing each other so a
+ * user knows which door to use rather than treating them as rivals.
+ */
+function LabsCrossLink() {
+  const { t } = useTranslations();
+  return (
+    <Link
+      href="/labs"
+      data-slot="glucose-labs-link"
+      className="text-muted-foreground hover:text-foreground border-border/60 flex items-start gap-1.5 border-t pt-3 text-xs leading-relaxed underline-offset-4 hover:underline"
+    >
+      <FlaskConical className="mt-0.5 size-3 shrink-0" aria-hidden="true" />
+      <span>{t("insights.bloodGlucose.clinical.labsLink")}</span>
+    </Link>
+  );
+}
+
 function Metric({
   icon,
   label,

src/components/insights/health-score-card.tsx

@@ -1,7 +1,7 @@
 "use client";
 
 import { useId, useMemo, useState } from "react";
-import { ArrowDown, ArrowUp, ChevronDown, Minus } from "lucide-react";
+import { ArrowDown, ArrowUp, ChevronDown, Minus, Moon } from "lucide-react";
 import { useTranslations } from "@/lib/i18n/context";
 import { cn } from "@/lib/utils";
 import { HealthScoreDeltaExplainer } from "./health-score-delta-explainer";
@@ -87,6 +87,15 @@ export interface HealthScoreCardProps {
    * four-row layout for the common (mood-enabled) case.
    */
   moodEnabled?: boolean;
+  /**
+   * v1.18.6 — Rest Mode annotation. When an illness episode is active the
+   * server suppresses (never penalises) the score; the card itself then
+   * carries an explicit "paused during illness — not being judged today"
+   * line so a frozen/held number reads as intentional rather than as a
+   * silent drop. Value-free: the card only needs to know that it is
+   * active, not the episode details. Default off (the common case).
+   */
+  restModeActive?: boolean;
 }
 
 type ComponentKey = keyof HealthScoreCardProps["components"];
@@ -174,6 +183,7 @@ export function HealthScoreCard({
   onAskCoach: _onAskCoach,
   initiallyExpanded = false,
   moodEnabled = true,
+  restModeActive = false,
 }: HealthScoreCardProps) {
   const { t, locale } = useTranslations();
   // The asOf timestamps render under the source pill as a tooltip
@@ -404,6 +414,21 @@ export function HealthScoreCard({
           )}
         </p>
 
+        {/* v1.18.6 — Rest Mode legibility. While an illness episode is
+            active the server suppresses (never penalises) the score, so
+            the card states plainly that the number is paused and not being
+            judged today. Without this the held score reads as a silent
+            decline. */}
+        {restModeActive && (
+          <p
+            data-slot="health-score-card-rest-mode"
+            className="text-muted-foreground inline-flex items-start gap-1.5 text-[11px] leading-relaxed"
+          >
+            <Moon className="mt-0.5 size-3 shrink-0" aria-hidden="true" />
+            <span>{t("insights.healthScore.restModePaused")}</span>
+          </p>
+        )}
+
         <ul
           data-slot="health-score-card-components"
           // v1.8.5 W4a — the always-visible "Zusammensetzung" breakdown is

src/components/insights/hero-strip.tsx

@@ -90,6 +90,12 @@ interface HeroStripProps {
     band: HealthScoreCardProps["band"];
     components: HealthScoreCardProps["components"];
     delta: HealthScoreCardProps["delta"];
+    /**
+     * v1.18.6 — value-free Rest Mode annotation off the analytics
+     * payload. When present + active the score card states it is paused
+     * during illness (suppressed, not penalised).
+     */
+    restMode?: { active: boolean } | null;
   } | null;
   /**
    * v1.16.8 — true while the analytics payload that carries
@@ -346,6 +352,7 @@ export function HeroStrip({
             components={healthScore.components}
             delta={healthScore.delta}
             moodEnabled={moodEnabled}
+            restModeActive={healthScore.restMode?.active ?? false}
             onAskCoach={
               // v1.4.37 W5 — short-circuit the prop drilling even
               // though `HealthScoreCard` retired its inline button in

src/components/insights/insight-status-card.tsx

@@ -1,6 +1,7 @@
 "use client";
 
 import { useEffect, useRef, useState } from "react";
+import Link from "next/link";
 
 import { Card, CardContent, CardHeader } from "@/components/ui/card";
 import { Skeleton } from "@/components/ui/skeleton";
@@ -144,14 +145,21 @@ export function InsightStatusCard({
 
   if (!hasProvider) {
     return (
-      <Card className="gap-1.5 py-4 opacity-60 md:py-5">
+      <Card className="gap-1.5 py-4 opacity-80 md:py-5">
         <CardHeader className="pb-1">
           <TileHeader icon={nodeIcon(icon)} title={title} />
         </CardHeader>
-        <CardContent>
+        <CardContent className="flex flex-col gap-1.5">
           <p className="text-muted-foreground text-sm">
             {t("insights.noProviderConfigured")}
           </p>
+          <Link
+            href="/settings/ai"
+            data-slot="insight-status-no-provider-cta"
+            className="text-primary text-sm font-medium underline-offset-4 hover:underline"
+          >
+            {t("insights.noProviderAction")}
+          </Link>
         </CardContent>
       </Card>
     );

src/components/onboarding/DoneScreen.tsx

@@ -1,7 +1,13 @@
 "use client";
 
 import Link from "next/link";
-import { CheckCircle2, FileUp, PlusCircle, Plug } from "lucide-react";
+import {
+  CheckCircle2,
+  FileUp,
+  PlusCircle,
+  Plug,
+  Sparkles,
+} from "lucide-react";
 
 import { Button } from "@/components/ui/button";
 import { useTranslations } from "@/lib/i18n/context";
@@ -51,6 +57,33 @@ export function DoneScreen() {
         </p>
       </header>
 
+      {/* v1.18.6 — surface the AI Insights / Coach / briefing setup at
+          the highest-intent moment. The flagship feature needs a BYOK or
+          local provider that the rest of onboarding never mentions, so a
+          fresh user otherwise discovers it as a cold error. This card is
+          skippable by construction — it is an optional deep-link, not a
+          gate. */}
+      <div className="border-border/60 bg-muted/30 mx-auto flex w-full max-w-md flex-col items-center gap-2 rounded-lg border p-4 text-center">
+        <span
+          aria-hidden="true"
+          className="from-dracula-purple to-dracula-pink flex size-9 items-center justify-center rounded-full bg-gradient-to-br"
+        >
+          <Sparkles className="text-background size-4" />
+        </span>
+        <p className="text-foreground text-sm font-medium">
+          {t("onboarding.done.aiTitle")}
+        </p>
+        <p className="text-muted-foreground text-sm leading-relaxed">
+          {t("onboarding.done.aiBody")}
+        </p>
+        <Link
+          href="/settings/ai"
+          className="text-primary text-sm font-medium underline-offset-4 hover:underline"
+        >
+          {t("onboarding.done.aiCta")}
+        </Link>
+      </div>
+
       <div className="flex w-full max-w-xs flex-col gap-2">
         <Button asChild size="lg">
           <Link

src/components/settings/modules-section.tsx

@@ -118,21 +118,29 @@ export function ModulesSection() {
       aria-labelledby="settings-section-modules-title"
       className="space-y-6"
     >
-      {/* v1.18.1 (D0) — section blurb dropped for consistent top alignment. */}
-      <header>
+      {/* v1.18.6 — restore a short intro line so a new user understands
+          that this page drives the nav, tiles and assessments they see.
+          (Dropped in v1.18.1 D0 for top alignment; the orientation cost
+          outweighed the alignment.) */}
+      <header className="space-y-1">
         <h1 id="settings-section-modules-title" className="sr-only">
           {t("settings.sections.modules.title")}
         </h1>
+        <p className="text-muted-foreground text-sm leading-relaxed">
+          {t("settings.sections.modules.description")}
+        </p>
       </header>
 
-      {/* Toggleable modules. v1.18.1 (D2) — the explanatory line above the
-          first card dropped; the per-row labels carry the meaning. */}
       <div className="bg-card border-border rounded-xl border p-4 sm:p-6">
         <SettingsCardHeader
           icon={Blocks}
           title={t("settings.sections.modules.toggleable.title")}
           className="mb-2"
         />
+        {/* v1.18.6 — restore the one-line "what this section does" hint. */}
+        <p className="text-muted-foreground mb-3 pl-7 text-sm leading-relaxed">
+          {t("settings.sections.modules.toggleable.description")}
+        </p>
         <div className="divide-border divide-y pl-7">
           {(Object.keys(MODULE_REGISTRY) as ModuleKey[]).map((key) => {
             const def = MODULE_REGISTRY[key];

src/lib/ai/coach/snapshot.ts

@@ -23,6 +23,7 @@ import {
   type CoachDataCluster,
 } from "@/lib/validations/coach-prefs";
 import { DEFAULT_TIMEZONE } from "@/lib/tz/resolver";
+import { userDayKey } from "@/lib/tz/format";
 import { convertGlucose, resolveGlucoseUnit } from "@/lib/glucose";
 import {
   computeGlucoseClinicalMetrics,
@@ -223,15 +224,11 @@ function windowToDays(window: CoachScopeWindow): number {
  * "last night" answer has to use the user's clock, not UTC. Up to
  * v1.4.24 the day-key was UTC, so a 23:50 Pacific/Auckland reading
  * landed in the next UTC day's bucket and the Coach couldn't pair it
- * with the user's mental model.
+ * with the user's mental model. Delegates to the canonical
+ * `userDayKey` so every day-bucket surface stays byte-aligned.
  */
 function tzDayKey(date: Date, tz: string): string {
-  return new Intl.DateTimeFormat("en-CA", {
-    timeZone: tz,
-    year: "numeric",
-    month: "2-digit",
-    day: "2-digit",
-  }).format(date);
+  return userDayKey(date, tz);
 }
 
 /**

src/lib/dashboard/bands.ts

@@ -0,0 +1,143 @@
+/**
+ * Dashboard band / target math — the single source of truth.
+ *
+ * Pure projection over a user's profile facts (DOB / gender / height):
+ * no DB read, no clock, no network, no `server-only` dep. Every building
+ * block it composes (`@/lib/analytics/{value-bands,bp-targets,pulse-targets}`)
+ * is itself client-safe, so this leaf imports cleanly into both the
+ * server-side snapshot builder (`@/lib/dashboard/snapshot`) and the
+ * `"use client"` dashboard page fallback (`src/app/page.tsx`).
+ *
+ * Before v1.18.6 the band construction lived inline in two places — the
+ * snapshot builder and the page's snapshot-disabled fallback — so a
+ * threshold change had to be mirrored by hand or the two surfaces would
+ * grade the same metric differently. Both now call `buildDashboardBands`,
+ * so the band/target math lives in exactly one place. `buildTargetBands`
+ * is kept as an alias for the snapshot-era import sites.
+ */
+import { getBpTargets, type BpTargets } from "@/lib/analytics/bp-targets";
+import {
+  buildTrafficLightBands,
+  buildTrafficRange,
+  buildWeightBandsFromHeight,
+  buildWeightRangeFromHeight,
+  getBodyFatTargetRange,
+  type ValueBand,
+  type TrafficRange,
+} from "@/lib/analytics/value-bands";
+import {
+  getAgeFromDateOfBirth,
+  getPersonalizedPulseTarget,
+} from "@/lib/analytics/pulse-targets";
+
+export interface DashboardTargetBands {
+  /** Personalised BP target numbers (null when no DOB). */
+  bpTargets: BpTargets | null;
+  /** Systolic traffic range (null when no DOB). */
+  bpSysRange: TrafficRange | null;
+  /** Diastolic traffic range (null when no DOB). */
+  bpDiaRange: TrafficRange | null;
+  /** Resting-pulse display range (always present — AHA fallback). */
+  pulseDisplayRange: {
+    greenMin: number;
+    greenMax: number;
+    orangeMin: number;
+    orangeMax: number;
+  };
+  /** Resting-pulse chart bands (always present — AHA fallback). */
+  pulseBands: ValueBand[];
+  /** Body-fat target range (gender-aware; always present). */
+  bodyFatRange: { min: number; max: number };
+  /** Body-fat chart bands (always present). */
+  bodyFatBands: ValueBand[];
+  /** Weight traffic range (null when no height). */
+  weightRange: TrafficRange | null;
+  /** Weight chart bands (null when no height). */
+  weightBands: ValueBand[] | null;
+}
+
+/**
+ * Resolve the band / target math from a user's profile facts. Pure; no
+ * DB read. The snapshot builder and the page fallback both call this so
+ * they produce byte-identical numbers.
+ */
+export function buildDashboardBands(profile: {
+  dateOfBirth: Date | null;
+  gender: "MALE" | "FEMALE" | null;
+  heightCm: number | null;
+}): DashboardTargetBands {
+  const bpTargets = profile.dateOfBirth
+    ? getBpTargets(profile.dateOfBirth)
+    : null;
+  const pulseAge = getAgeFromDateOfBirth(profile.dateOfBirth);
+  const pulseTarget = getPersonalizedPulseTarget(pulseAge, profile.gender);
+  const bodyFatRange = getBodyFatTargetRange(profile.gender);
+  const weightRange = profile.heightCm
+    ? buildWeightRangeFromHeight(profile.heightCm)
+    : null;
+  const weightBands = profile.heightCm
+    ? buildWeightBandsFromHeight(profile.heightCm, {
+        lowerBound: 30,
+        upperBound: 250,
+      })
+    : null;
+  const bpSysRange = bpTargets
+    ? buildTrafficRange(bpTargets.sysLow, bpTargets.sysHigh)
+    : null;
+  const bpDiaRange = bpTargets
+    ? buildTrafficRange(bpTargets.diaLow, bpTargets.diaHigh)
+    : null;
+  const pulseBands = [
+    { min: 30, max: pulseTarget.orangeMin, color: "#ff5555", opacity: 0.16 },
+    {
+      min: pulseTarget.orangeMin,
+      max: pulseTarget.greenMin,
+      color: "#ffb86c",
+      opacity: 0.18,
+    },
+    {
+      min: pulseTarget.greenMin,
+      max: pulseTarget.greenMax,
+      color: "#50fa7b",
+      opacity: 0.2,
+    },
+    {
+      min: pulseTarget.greenMax,
+      max: pulseTarget.orangeMax,
+      color: "#ffb86c",
+      opacity: 0.18,
+    },
+    { min: pulseTarget.orangeMax, max: 220, color: "#ff5555", opacity: 0.16 },
+  ].filter((band) => band.max > band.min);
+  const bodyFatBands = buildTrafficLightBands(
+    bodyFatRange.min,
+    bodyFatRange.max,
+    {
+      lowerBound: 2,
+      upperBound: 55,
+    },
+  );
+  return {
+    bpTargets,
+    bpSysRange,
+    bpDiaRange,
+    pulseDisplayRange: {
+      greenMin: pulseTarget.greenMin,
+      greenMax: pulseTarget.greenMax,
+      orangeMin: pulseTarget.orangeMin,
+      orangeMax: pulseTarget.orangeMax,
+    },
+    pulseBands,
+    bodyFatRange,
+    bodyFatBands,
+    weightRange,
+    weightBands,
+  };
+}
+
+/**
+ * Snapshot-era alias. The snapshot builder and its parity test still
+ * import `buildTargetBands`; keep the name pointing at the canonical
+ * builder so neither has to change.
+ */
+export const buildTargetBands = buildDashboardBands;

src/lib/dashboard/snapshot.ts

@@ -45,20 +45,7 @@ import {
   type DataPoint,
   type DataSummary,
 } from "@/lib/analytics/trends";
-import { getBpTargets, type BpTargets } from "@/lib/analytics/bp-targets";
-import {
-  buildTrafficLightBands,
-  buildTrafficRange,
-  buildWeightBandsFromHeight,
-  buildWeightRangeFromHeight,
-  getBodyFatTargetRange,
-  type ValueBand,
-  type TrafficRange,
-} from "@/lib/analytics/value-bands";
-import {
-  getAgeFromDateOfBirth,
-  getPersonalizedPulseTarget,
-} from "@/lib/analytics/pulse-targets";
+import { getBpTargets } from "@/lib/analytics/bp-targets";
 import {
   computeGlucoseClinicalMetrics,
   GLUCOSE_PANEL_WINDOW_DAYS,
@@ -90,6 +77,11 @@ import {
   type MedsTodayBlock,
 } from "@/lib/dashboard/meds-today";
 import { computeUserHealthScoreFastPath } from "@/lib/analytics/health-score-fast-path";
+import {
+  buildDashboardBands,
+  buildTargetBands,
+  type DashboardTargetBands,
+} from "@/lib/dashboard/bands";
 import type {
   HealthScoreBand,
   RestModeAnnotation,
@@ -225,31 +217,8 @@ export interface DashboardSnapshotUser {
  * personalisation, no height → weight band), matching the client's
  * previous null-guards exactly.
  */
-export interface DashboardTargetBands {
-  /** Personalised BP target numbers (null when no DOB). */
-  bpTargets: BpTargets | null;
-  /** Systolic traffic range (null when no DOB). */
-  bpSysRange: TrafficRange | null;
-  /** Diastolic traffic range (null when no DOB). */
-  bpDiaRange: TrafficRange | null;
-  /** Resting-pulse display range (always present — AHA fallback). */
-  pulseDisplayRange: {
-    greenMin: number;
-    greenMax: number;
-    orangeMin: number;
-    orangeMax: number;
-  };
-  /** Resting-pulse chart bands (always present — AHA fallback). */
-  pulseBands: ValueBand[];
-  /** Body-fat target range (gender-aware; always present). */
-  bodyFatRange: { min: number; max: number };
-  /** Body-fat chart bands (always present). */
-  bodyFatBands: ValueBand[];
-  /** Weight traffic range (null when no height). */
-  weightRange: TrafficRange | null;
-  /** Weight chart bands (null when no height). */
-  weightBands: ValueBand[] | null;
-}
+export { buildDashboardBands, buildTargetBands };
+export type { DashboardTargetBands };
 
 export interface DashboardSnapshotMoodEntry {
   date: string;
@@ -661,84 +630,6 @@ async function buildExtras(
   };
 }
 
-/**
- * v1.18.6 — resolve the band / target math server-side from the same
- * helpers the client used. Pure projection over the profile facts; no DB
- * read. Mirrors the exact construction `page.tsx` ran (same helper calls,
- * same literal pulse-band colours/opacities, same null-guards) so the
- * snapshot path and the legacy client-compute path produce byte-identical
- * numbers.
- */
-export function buildTargetBands(profile: {
-  dateOfBirth: Date | null;
-  gender: "MALE" | "FEMALE" | null;
-  heightCm: number | null;
-}): DashboardTargetBands {
-  const bpTargets = profile.dateOfBirth
-    ? getBpTargets(profile.dateOfBirth)
-    : null;
-  const pulseAge = getAgeFromDateOfBirth(profile.dateOfBirth);
-  const pulseTarget = getPersonalizedPulseTarget(pulseAge, profile.gender);
-  const bodyFatRange = getBodyFatTargetRange(profile.gender);
-  const weightRange = profile.heightCm
-    ? buildWeightRangeFromHeight(profile.heightCm)
-    : null;
-  const weightBands = profile.heightCm
-    ? buildWeightBandsFromHeight(profile.heightCm, {
-        lowerBound: 30,
-        upperBound: 250,
-      })
-    : null;
-  const bpSysRange = bpTargets
-    ? buildTrafficRange(bpTargets.sysLow, bpTargets.sysHigh)
-    : null;
-  const bpDiaRange = bpTargets
-    ? buildTrafficRange(bpTargets.diaLow, bpTargets.diaHigh)
-    : null;
-  const pulseBands = [
-    { min: 30, max: pulseTarget.orangeMin, color: "#ff5555", opacity: 0.16 },
-    {
-      min: pulseTarget.orangeMin,
-      max: pulseTarget.greenMin,
-      color: "#ffb86c",
-      opacity: 0.18,
-    },
-    {
-      min: pulseTarget.greenMin,
-      max: pulseTarget.greenMax,
-      color: "#50fa7b",
-      opacity: 0.2,
-    },
-    {
-      min: pulseTarget.greenMax,
-      max: pulseTarget.orangeMax,
-      color: "#ffb86c",
-      opacity: 0.18,
-    },
-    { min: pulseTarget.orangeMax, max: 220, color: "#ff5555", opacity: 0.16 },
-  ].filter((band) => band.max > band.min);
-  const bodyFatBands = buildTrafficLightBands(bodyFatRange.min, bodyFatRange.max, {
-    lowerBound: 2,
-    upperBound: 55,
-  });
-  return {
-    bpTargets,
-    bpSysRange,
-    bpDiaRange,
-    pulseDisplayRange: {
-      greenMin: pulseTarget.greenMin,
-      greenMax: pulseTarget.greenMax,
-      orangeMin: pulseTarget.orangeMin,
-      orangeMax: pulseTarget.orangeMax,
-    },
-    pulseBands,
-    bodyFatRange,
-    bodyFatBands,
-    weightRange,
-    weightBands,
-  };
-}
-
 /** Parse + validate the cached `dailyBriefing` block; null when unusable. */
 function parseCachedBriefing(
   cachedText: string | null,

src/lib/dashboard/verdict.ts

@@ -31,6 +31,7 @@ import {
   COACH_NUDGE_SLEEP_DEFICIT_MARGIN_H,
 } from "@/lib/jobs/coach-nudge-thresholds";
 import { buildWeightRangeFromHeight } from "@/lib/analytics/value-bands";
+import { userDayKey } from "@/lib/tz/format";
 import type { DashboardSnapshot } from "@/lib/dashboard/snapshot";
 
 const DAY_MS = 24 * 60 * 60 * 1000;
@@ -93,16 +94,6 @@ export interface DashboardVerdict {
   cta: DashboardVerdictCta | null;
 }
 
-/** YYYY-MM-DD key of `d`'s calendar day in `tz`. */
-function dayKeyInTz(d: Date, tz: string): string {
-  return new Intl.DateTimeFormat("en-CA", {
-    timeZone: tz,
-    year: "numeric",
-    month: "2-digit",
-    day: "2-digit",
-  }).format(d);
-}
-
 /** HH:mm wall-clock of `d` in `tz`. */
 function hmInTz(d: Date, tz: string): string {
   const parts = new Intl.DateTimeFormat("en-GB", {
@@ -176,7 +167,7 @@ export function resolveDashboardVerdict(
     if (
       untilDue >= 0 &&
       untilDue <= DOSE_UPCOMING_WINDOW_MS &&
-      dayKeyInTz(new Date(dueMs), tz) === dayKeyInTz(now, tz)
+      userDayKey(new Date(dueMs), tz) === userDayKey(now, tz)
     ) {
       return {
         variant: "doseUpcoming",

src/lib/mood/date-key.ts

@@ -28,6 +28,8 @@
  * legacy date string (`effectiveMoodTz`).
  */
 
+import { userDayKey } from "@/lib/tz/format";
+
 export const DEFAULT_TIMEZONE = "Europe/Berlin";
 
 /**
@@ -35,14 +37,14 @@ export const DEFAULT_TIMEZONE = "Europe/Berlin";
  * timezone at write time. Used by `POST /api/mood-entries` and the
  * `PUT /api/mood-entries/:id` route when `moodLoggedAt` changes.
  *
- * The Swedish locale ("sv-SE") is the historical choice for ISO 8601
- * day output via `Intl.DateTimeFormat`; we keep it so the new path
- * produces byte-identical strings to the legacy `toBerlinDate()` for
- * Europe/Berlin users (the only path tested under the v1.4.24 suite).
+ * Delegates to the canonical `userDayKey` so the mood day-bucket key
+ * stays byte-identical to every other day-bucket surface. The ISO
+ * YYYY-MM-DD shape is unchanged from the legacy sv-SE formatter; the
+ * empty-tz fallback to Europe/Berlin is preserved here.
  */
 export function moodDateKey(date: Date, tz: string): string {
   const safe = tz && tz.length > 0 ? tz : DEFAULT_TIMEZONE;
-  return new Intl.DateTimeFormat("sv-SE", { timeZone: safe }).format(date);
+  return userDayKey(date, safe);
 }
 
 /**