fix(doctor-report): footer states the user's own timezone, not Berlin

The clinician PDF footer read "Timezone: Europe/Berlin" for every user
regardless of their actual timezone — a maintainer-anchored default leaking
into a document handed to a clinician, who then reads every timestamp on
the page against the wrong basis for a non-Berlin operator.

`userTz` already carries the resolved per-user zone into the formatters;
thread the same resolution (valid IANA name, else the Berlin fallback) into
the footer string as {timezone} instead of the literal text.

messages/de.json

@@ -91,7 +91,7 @@
     "colShare": "Anteil",
     "footerDisclaimer1": "Dieser Bericht wurde automatisch aus selbst erfassten Daten generiert und dient ausschließlich zur Unterstützung",
     "footerDisclaimer2": "des Arzt-Patienten-Gesprächs. Er ersetzt keine ärztliche Diagnose. Korrelationen implizieren keine Kausalität.",
-    "footerSource": "Quelle: HealthLog | Zeitzone: Europe/Berlin | Erstellt: {timestamp}",
+    "footerSource": "Quelle: HealthLog | Zeitzone: {timezone} | Erstellt: {timestamp}",
     "typeWeight": "Körpergewicht",
     "typeBpSys": "Systolischer Blutdruck",
     "typeBpDia": "Diastolischer Blutdruck",

messages/en.json

@@ -91,7 +91,7 @@
     "colShare": "Share",
     "footerDisclaimer1": "This report was generated automatically from self-tracked data and is intended to support",
     "footerDisclaimer2": "the doctor–patient conversation. It does not replace a medical diagnosis. Correlations do not imply causation.",
-    "footerSource": "Source: HealthLog | Timezone: Europe/Berlin | Created: {timestamp}",
+    "footerSource": "Source: HealthLog | Timezone: {timezone} | Created: {timestamp}",
     "typeWeight": "Body weight",
     "typeBpSys": "Systolic blood pressure",
     "typeBpDia": "Diastolic blood pressure",

messages/es.json

@@ -91,7 +91,7 @@
     "colShare": "Porcentaje",
     "footerDisclaimer1": "Este informe se generó automáticamente a partir de datos autorregistrados y está destinado a apoyar",
     "footerDisclaimer2": "la conversación entre médico y paciente. No sustituye un diagnóstico médico. Las correlaciones no implican causalidad.",
-    "footerSource": "Fuente: HealthLog | Zona horaria: Europe/Berlin | Creado: {timestamp}",
+    "footerSource": "Fuente: HealthLog | Zona horaria: {timezone} | Creado: {timestamp}",
     "typeWeight": "Peso corporal",
     "typeBpSys": "Tensión arterial sistólica",
     "typeBpDia": "Tensión arterial diastólica",

messages/fr.json

@@ -91,7 +91,7 @@
     "colShare": "Part",
     "footerDisclaimer1": "Ce rapport a été généré automatiquement à partir de données auto-déclarées et vise à soutenir",
     "footerDisclaimer2": "la conversation médecin-patient. Il ne remplace pas un diagnostic médical. Les corrélations n'impliquent pas la causalité.",
-    "footerSource": "Source : HealthLog | Fuseau horaire : Europe/Berlin | Créé : {timestamp}",
+    "footerSource": "Source : HealthLog | Fuseau horaire : {timezone} | Créé : {timestamp}",
     "typeWeight": "Poids corporel",
     "typeBpSys": "Tension artérielle systolique",
     "typeBpDia": "Tension artérielle diastolique",

messages/it.json

@@ -91,7 +91,7 @@
     "colShare": "Quota",
     "footerDisclaimer1": "Questo rapporto è stato generato automaticamente da dati auto-registrati ed è destinato a supportare",
     "footerDisclaimer2": "il dialogo medico-paziente. Non sostituisce una diagnosi medica. Le correlazioni non implicano causalità.",
-    "footerSource": "Fonte: HealthLog | Fuso orario: Europe/Berlin | Creato: {timestamp}",
+    "footerSource": "Fonte: HealthLog | Fuso orario: {timezone} | Creato: {timestamp}",
     "typeWeight": "Peso corporeo",
     "typeBpSys": "Pressione arteriosa sistolica",
     "typeBpDia": "Pressione arteriosa diastolica",

messages/pl.json

@@ -91,7 +91,7 @@
     "colShare": "Udział",
     "footerDisclaimer1": "Ten raport został wygenerowany automatycznie z danych samodzielnie rejestrowanych i ma na celu wspierać",
     "footerDisclaimer2": "rozmowę lekarza z pacjentem. Nie zastępuje diagnozy medycznej. Korelacje nie oznaczają związku przyczynowego.",
-    "footerSource": "Źródło: HealthLog | Strefa czasowa: Europe/Berlin | Utworzono: {timestamp}",
+    "footerSource": "Źródło: HealthLog | Strefa czasowa: {timezone} | Utworzono: {timestamp}",
     "typeWeight": "Masa ciała",
     "typeBpSys": "Ciśnienie skurczowe",
     "typeBpDia": "Ciśnienie rozkurczowe",

src/lib/doctor-report-pdf-core.ts

@@ -12,9 +12,14 @@
 import { jsPDF } from "jspdf";
 import autoTable from "jspdf-autotable";
 import { DOCTOR_REPORT_TYPE_LABEL_KEYS } from "./doctor-report/type-label-keys";
-import { makeFormatters, type TimeFormatPreference } from "./format-locale";
+import {
+  makeFormatters,
+  DISPLAY_TIMEZONE,
+  type TimeFormatPreference,
+} from "./format-locale";
 import type { Locale } from "./i18n/config";
 import { convertGlucose, resolveGlucoseUnit } from "./glucose";
+import { isValidTimezone } from "./tz/format";
 import {
   classifyReferenceRange,
   formatReferenceRange,
@@ -505,6 +510,13 @@ export function buildDoctorReportPdfDocument(
   const num = (value: number, decimals = 1) =>
     formatters.number(value, decimals);
   const fmtDate = (iso: string) => formatters.date(iso);
+  // Same resolution `makeFormatters` applies internally (valid IANA name or
+  // the Europe/Berlin fallback) — the footer must state the SAME zone the
+  // timestamps above it were actually rendered in, not a maintainer-anchored
+  // default. A clinician reading a non-Berlin operator's PDF needs the real
+  // provenance of every timestamp on the page.
+  const footerTz =
+    userTz && isValidTimezone(userTz) ? userTz : DISPLAY_TIMEZONE;
 
   const unitFor = (type: string): string => {
     const staticUnit = DOCTOR_REPORT_TYPE_UNIT_KEYS[type];
@@ -1797,6 +1809,7 @@ export function buildDoctorReportPdfDocument(
     pageDoc.text(t("doctorReport.footerDisclaimer2"), margin, pageHeight - 10);
     pageDoc.text(
       t("doctorReport.footerSource", {
+        timezone: footerTz,
         timestamp: formatters.dateTime(now),
       }),
       margin,