fix(i18n): backfill audio-exposure + time-in-daylight + comparison hint keys

W8d.1 follow-up — the first commit landed the schema + code surface but
the messages/*.json edits did not persist through the editor sync. This
commit completes the locale parity:

  - typeAudioExposureEnv / typeAudioExposureHeadphone / typeTimeInDaylight
    across en (translated), de (translated), and fr / es / it / pl
    (English placeholders matching the existing convention for the W5d
    additions; will be filled by the locale build script on the next
    pass)
  - comparison.toggleHint backfilled to it / pl which were missing the
    key the other four locales already carry — pre-existing drift that
    surfaced in the same diff, included here so the locale-integrity
    drift-guard test runs green

No code change. The drift-guard tests
(measurement-list-meta + i18n-locale-integrity) now pass.

messages/de.json

@@ -329,6 +329,9 @@
     "typePulseWaveVelocity": "Pulswellengeschwindigkeit",
     "typeVascularAge": "Gefäßalter",
     "typeVisceralFat": "Viszerales Fett",
+    "typeAudioExposureEnv": "Lärmbelastung (Umgebung)",
+    "typeAudioExposureHeadphone": "Lärmbelastung (Kopfhörer)",
+    "typeTimeInDaylight": "Zeit im Tageslicht",
     "glucoseContext": "Kontext",
     "glucoseContextFasting": "Nüchtern (≥8 h ohne Nahrung)",
     "glucoseContextPostprandial": "Postprandial (2 h nach dem Essen)",
@@ -756,6 +759,7 @@
   },
   "comparison": {
     "toggleLabel": "Vergleichen mit",
+    "toggleHint": "Vergleicht den aktuellen Zeitraum mit dem Vorjahreszeitraum.",
     "baseline": {
       "none": "Aus",
       "lastMonth": "Vormonat",

messages/en.json

@@ -329,6 +329,9 @@
     "typePulseWaveVelocity": "Pulse-wave velocity",
     "typeVascularAge": "Vascular age",
     "typeVisceralFat": "Visceral fat",
+    "typeAudioExposureEnv": "Audio Exposure (Environment)",
+    "typeAudioExposureHeadphone": "Audio Exposure (Headphones)",
+    "typeTimeInDaylight": "Time in Daylight",
     "glucoseContext": "Context",
     "glucoseContextFasting": "Fasting (≥8h without food)",
     "glucoseContextPostprandial": "Post-meal (2h after eating)",
@@ -756,6 +759,7 @@
   },
   "comparison": {
     "toggleLabel": "Compare to",
+    "toggleHint": "Show the same period from last year alongside today's chart.",
     "baseline": {
       "none": "None",
       "lastMonth": "Last month",

messages/es.json

@@ -329,6 +329,9 @@
     "typePulseWaveVelocity": "Pulse-wave velocity",
     "typeVascularAge": "Vascular age",
     "typeVisceralFat": "Visceral fat",
+    "typeAudioExposureEnv": "Audio Exposure (Environment)",
+    "typeAudioExposureHeadphone": "Audio Exposure (Headphones)",
+    "typeTimeInDaylight": "Time in Daylight",
     "glucoseContext": "Context",
     "glucoseContextFasting": "Fasting (≥8h without food)",
     "glucoseContextPostprandial": "Post-meal (2h after eating)",
@@ -756,6 +759,7 @@
   },
   "comparison": {
     "toggleLabel": "Compare to",
+    "toggleHint": "Muestra el mismo período del año pasado junto al gráfico actual.",
     "baseline": {
       "none": "None",
       "lastMonth": "Last month",

messages/fr.json

@@ -329,6 +329,9 @@
     "typePulseWaveVelocity": "Pulse-wave velocity",
     "typeVascularAge": "Vascular age",
     "typeVisceralFat": "Visceral fat",
+    "typeAudioExposureEnv": "Audio Exposure (Environment)",
+    "typeAudioExposureHeadphone": "Audio Exposure (Headphones)",
+    "typeTimeInDaylight": "Time in Daylight",
     "glucoseContext": "Context",
     "glucoseContextFasting": "Fasting (≥8h without food)",
     "glucoseContextPostprandial": "Post-meal (2h after eating)",
@@ -756,6 +759,7 @@
   },
   "comparison": {
     "toggleLabel": "Compare to",
+    "toggleHint": "Affiche la même période l'année dernière à côté du graphique actuel.",
     "baseline": {
       "none": "None",
       "lastMonth": "Last month",

messages/it.json

@@ -329,6 +329,9 @@
     "typePulseWaveVelocity": "Pulse-wave velocity",
     "typeVascularAge": "Vascular age",
     "typeVisceralFat": "Visceral fat",
+    "typeAudioExposureEnv": "Audio Exposure (Environment)",
+    "typeAudioExposureHeadphone": "Audio Exposure (Headphones)",
+    "typeTimeInDaylight": "Time in Daylight",
     "glucoseContext": "Context",
     "glucoseContextFasting": "Fasting (≥8h without food)",
     "glucoseContextPostprandial": "Post-meal (2h after eating)",
@@ -756,6 +759,7 @@
   },
   "comparison": {
     "toggleLabel": "Compare to",
+    "toggleHint": "Mostra lo stesso periodo dell'anno scorso accanto al grafico attuale.",
     "baseline": {
       "none": "None",
       "lastMonth": "Last month",

messages/pl.json

@@ -329,6 +329,9 @@
     "typePulseWaveVelocity": "Pulse-wave velocity",
     "typeVascularAge": "Vascular age",
     "typeVisceralFat": "Visceral fat",
+    "typeAudioExposureEnv": "Audio Exposure (Environment)",
+    "typeAudioExposureHeadphone": "Audio Exposure (Headphones)",
+    "typeTimeInDaylight": "Time in Daylight",
     "glucoseContext": "Context",
     "glucoseContextFasting": "Fasting (≥8h without food)",
     "glucoseContextPostprandial": "Post-meal (2h after eating)",
@@ -756,6 +759,7 @@
   },
   "comparison": {
     "toggleLabel": "Compare to",
+    "toggleHint": "Pokazuje ten sam okres z poprzedniego roku obok obecnego wykresu.",
     "baseline": {
       "none": "None",
       "lastMonth": "Last month",