refactor(insights): migrate route slugs to english with redirects

Rename every routed Insights sub-page slug from German to English
(`/insights/blutdruck` -> `/insights/blood-pressure`, `gewicht` ->
`weight`, `medikamente` -> `medications`, and the full v1.7.0 metric
tail). UI copy stays localised through `t()` keys; only the internal
slugs change. The slug registry in `src/lib/insights/sub-page-metric.ts`
is the single source of truth, so the tab strip, target summary, and
daily-briefing routing targets follow it.

`next.config.ts` `redirects()` emits a permanent redirect from every
legacy German slug to its English target, including a `:path*` variant
so nested routes survive. Bookmarks and cached PWA navigation keep
resolving.

src/app/api/insights/glp1-timeline/route.ts

@@ -4,7 +4,7 @@
  * Returns a chronological merge of every GLP-1-relevant event the user
  * has logged: dose changes, injections (with site if recorded),
  * inventory events, and side-effect-tagged mood entries from the
- * trailing 90 days. Used by /insights/medikamente's TherapyTimeline
+ * trailing 90 days. Used by /insights/medications' TherapyTimeline
  * component. Web-only users without a GLP-1 medication get
  * `hasGlp1: false` so the component hides cleanly.
  */

src/app/insights/active-energy/page.tsx

@@ -5,7 +5,7 @@ import { Flame } from "lucide-react";
 import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page";
 
 /**
- * v1.4.32 — `/insights/aktive-energie`.
+ * v1.4.32 — `/insights/active-energy`.
  *
  * Active-energy-burned sub-page. The MeasurementType is cumulative
  * (kcal per day, per R-A Option A); the v1.4.30 server-side daily-

src/app/insights/audio-events/page.tsx

@@ -5,7 +5,7 @@ import { Volume2 } from "lucide-react";
 import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page";
 
 /**
- * v1.7.0 — `/insights/laermereignisse`.
+ * v1.7.0 — `/insights/audio-events`.
  *
  * AUDIO_EXPOSURE_EVENT sub-page. Reuses the generic HealthKitMetricPage scaffold;
  * the chart daily-aggregates through the rollup read path. Empty-state

src/app/insights/blood-glucose/page.tsx

@@ -5,7 +5,7 @@ import { Droplet } from "lucide-react";
 import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page";
 
 /**
- * v1.7.0 — `/insights/blutzucker`.
+ * v1.7.0 — `/insights/blood-glucose`.
  *
  * BLOOD_GLUCOSE sub-page. Reuses the generic HealthKitMetricPage scaffold;
  * the chart daily-aggregates through the rollup read path. Empty-state

src/app/insights/blood-pressure/page.tsx

@@ -18,7 +18,7 @@ import { SubPageShell } from "@/components/insights/sub-page-shell";
 import { getBpTargets } from "@/lib/analytics/bp-targets";
 
 /**
- * v1.4.25 W4 — `/insights/blutdruck`.
+ * v1.4.25 W4 — `/insights/blood-pressure`.
  *
  * Routed Blood-Pressure sub-page. The mother page hosts the overview
  * (hero + briefing + advisor); this page concentrates on BP-only depth:
@@ -114,7 +114,7 @@ export default function InsightsBlutdruckPage() {
         userTimezone={user?.timezone}
       />
 
-      <MetricTargetSummary slug="blutdruck" />
+      <MetricTargetSummary slug="blood-pressure" />
 
       <InsightStatusCard
         title={t("insights.assessmentTitle")}

src/app/insights/body-temperature/page.tsx

@@ -5,7 +5,7 @@ import { Thermometer } from "lucide-react";
 import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page";
 
 /**
- * v1.4.32 — `/insights/koerpertemperatur`.
+ * v1.4.32 — `/insights/body-temperature`.
  *
  * Body-temperature sub-page. Canonical storage is Celsius. Distinct
  * from skin temperature (Withings ScanWatch dermal reading) — surface

src/app/insights/body-water/page.tsx

@@ -5,7 +5,7 @@ import { Droplet } from "lucide-react";
 import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page";
 
 /**
- * v1.7.0 — `/insights/koerperwasser`.
+ * v1.7.0 — `/insights/body-water`.
  *
  * TOTAL_BODY_WATER sub-page. Reuses the generic HealthKitMetricPage scaffold;
  * the chart daily-aggregates through the rollup read path. Empty-state

src/app/insights/bone-mass/page.tsx

@@ -5,7 +5,7 @@ import { Bone } from "lucide-react";
 import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page";
 
 /**
- * v1.7.0 — `/insights/knochenmasse`.
+ * v1.7.0 — `/insights/bone-mass`.
  *
  * BONE_MASS sub-page. Reuses the generic HealthKitMetricPage scaffold;
  * the chart daily-aggregates through the rollup read path. Empty-state

src/app/insights/daylight/page.tsx

@@ -5,7 +5,7 @@ import { Sun } from "lucide-react";
 import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page";
 
 /**
- * v1.7.0 — `/insights/tageslicht`.
+ * v1.7.0 — `/insights/daylight`.
  *
  * TIME_IN_DAYLIGHT sub-page. Reuses the generic HealthKitMetricPage scaffold;
  * the chart daily-aggregates through the rollup read path. Empty-state

src/app/insights/double-support-time/page.tsx

@@ -5,7 +5,7 @@ import { Footprints } from "lucide-react";
 import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page";
 
 /**
- * v1.7.0 — `/insights/doppelstandphase`.
+ * v1.7.0 — `/insights/double-support-time`.
  *
  * WALKING_DOUBLE_SUPPORT sub-page. Reuses the generic HealthKitMetricPage scaffold;
  * the chart daily-aggregates through the rollup read path. Empty-state

src/app/insights/environmental-audio/page.tsx

@@ -5,7 +5,7 @@ import { Volume2 } from "lucide-react";
 import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page";
 
 /**
- * v1.7.0 — `/insights/laermbelastung`.
+ * v1.7.0 — `/insights/environmental-audio`.
  *
  * AUDIO_EXPOSURE_ENV sub-page. Reuses the generic HealthKitMetricPage scaffold;
  * the chart daily-aggregates through the rollup read path. Empty-state

src/app/insights/fat-free-mass/page.tsx

@@ -5,7 +5,7 @@ import { Scale } from "lucide-react";
 import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page";
 
 /**
- * v1.7.0 — `/insights/fettfreie-masse`.
+ * v1.7.0 — `/insights/fat-free-mass`.
  *
  * FAT_FREE_MASS sub-page. Reuses the generic HealthKitMetricPage scaffold;
  * the chart daily-aggregates through the rollup read path. Empty-state

src/app/insights/fat-mass/page.tsx

@@ -5,7 +5,7 @@ import { Droplets } from "lucide-react";
 import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page";
 
 /**
- * v1.7.0 — `/insights/fettmasse`.
+ * v1.7.0 — `/insights/fat-mass`.
  *
  * FAT_MASS sub-page. Reuses the generic HealthKitMetricPage scaffold;
  * the chart daily-aggregates through the rollup read path. Empty-state

src/app/insights/flights-climbed/page.tsx

@@ -5,7 +5,7 @@ import { TrendingUp } from "lucide-react";
 import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page";
 
 /**
- * v1.7.0 — `/insights/stockwerke`.
+ * v1.7.0 — `/insights/flights-climbed`.
  *
  * FLIGHTS_CLIMBED sub-page. Reuses the generic HealthKitMetricPage scaffold;
  * the chart daily-aggregates through the rollup read path. Empty-state

src/app/insights/headphone-audio/page.tsx

@@ -5,7 +5,7 @@ import { Headphones } from "lucide-react";
 import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page";
 
 /**
- * v1.7.0 — `/insights/kopfhoererpegel`.
+ * v1.7.0 — `/insights/headphone-audio`.
  *
  * AUDIO_EXPOSURE_HEADPHONE sub-page. Reuses the generic HealthKitMetricPage scaffold;
  * the chart daily-aggregates through the rollup read path. Empty-state

src/app/insights/lean-body-mass/page.tsx

@@ -5,7 +5,7 @@ import { Scale } from "lucide-react";
 import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page";
 
 /**
- * v1.7.0 — `/insights/magermasse`.
+ * v1.7.0 — `/insights/lean-body-mass`.
  *
  * LEAN_BODY_MASS sub-page. Reuses the generic HealthKitMetricPage scaffold;
  * the chart daily-aggregates through the rollup read path. Empty-state

src/app/insights/medications/page.tsx

@@ -21,7 +21,7 @@ import { TherapyTimeline } from "@/components/insights/therapy-timeline";
 import { MedicationCardHeader } from "@/components/medications/MedicationCardHeader";
 
 /**
- * v1.4.25 W4 — `/insights/medikamente`.
+ * v1.4.25 W4 — `/insights/medications`.
  *
  * Routed Medication-Compliance sub-page. Mirrors the per-medication
  * grid from the v1.4.24 mother page (compliance bars + heatmap +
@@ -166,7 +166,7 @@ export default function InsightsMedikamentePage() {
         {medications.map((med) => {
           const medicationSummary = medicationSummaryById.get(med.id);
           // UI-H3 — route every medication-list row (medications page
-          // + insights/medikamente) through `<MedicationCardHeader>`
+          // + insights/medications) through `<MedicationCardHeader>`
           // so the surface stays one shape: `{name} {dose}` on line 1
           // + outline category badge on line 2. The streak chip rides
           // the `stateBadges` slot so a strong streak still surfaces.
@@ -243,7 +243,7 @@ export default function InsightsMedikamentePage() {
         })}
       </div>
 
-      <MetricTargetSummary slug="medikamente" />
+      <MetricTargetSummary slug="medications" />
 
       <InsightStatusCard
         title={t("insights.assessmentTitle")}

src/app/insights/mood/page.tsx

@@ -19,7 +19,7 @@ import { MetricTargetSummary } from "@/components/insights/metric-target-summary
 import { SubPageShell } from "@/components/insights/sub-page-shell";
 
 /**
- * v1.4.25 W4 — `/insights/stimmung`.
+ * v1.4.25 W4 — `/insights/mood`.
  *
  * Routed Mood sub-page. Unlike the mother page (which hid the mood
  * section entirely when no mood data existed), a dedicated sub-page
@@ -105,7 +105,7 @@ export default function InsightsStimmungPage() {
         userTimezone={user?.timezone}
       />
 
-      <MetricTargetSummary slug="stimmung" />
+      <MetricTargetSummary slug="mood" />
 
       <InsightStatusCard
         title={t("insights.assessmentTitle")}

src/app/insights/muscle-mass/page.tsx

@@ -5,7 +5,7 @@ import { Dumbbell } from "lucide-react";
 import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page";
 
 /**
- * v1.7.0 — `/insights/muskelmasse`.
+ * v1.7.0 — `/insights/muscle-mass`.
  *
  * MUSCLE_MASS sub-page. Reuses the generic HealthKitMetricPage scaffold;
  * the chart daily-aggregates through the rollup read path. Empty-state

src/app/insights/oxygen/page.tsx

@@ -5,7 +5,7 @@ import { Wind } from "lucide-react";
 import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page";
 
 /**
- * v1.4.32 — `/insights/sauerstoff`.
+ * v1.4.32 — `/insights/oxygen`.
  *
  * Oxygen-saturation (SpO₂) sub-page. Canonical storage is percent
  * (0..100); the chart axis runs 85..100 because clinical normal is

src/app/insights/pulse-wave-velocity/page.tsx

@@ -5,7 +5,7 @@ import { Activity } from "lucide-react";
 import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page";
 
 /**
- * v1.7.0 — `/insights/pulswellengeschwindigkeit`.
+ * v1.7.0 — `/insights/pulse-wave-velocity`.
  *
  * PULSE_WAVE_VELOCITY sub-page. Reuses the generic HealthKitMetricPage scaffold;
  * the chart daily-aggregates through the rollup read path. Empty-state

src/app/insights/pulse/page.tsx

@@ -22,7 +22,7 @@ import {
 } from "@/lib/analytics/pulse-targets";
 
 /**
- * v1.4.25 W4 — `/insights/puls`.
+ * v1.4.25 W4 — `/insights/pulse`.
  *
  * Routed Pulse sub-page. Renders the pulse chart with the personalized
  * Karvonen-derived target band plus the per-section AI assessment.
@@ -126,7 +126,7 @@ export default function InsightsPulsPage() {
         userTimezone={user?.timezone}
       />
 
-      <MetricTargetSummary slug="puls" />
+      <MetricTargetSummary slug="pulse" />
 
       <InsightStatusCard
         title={t("insights.assessmentTitle")}

src/app/insights/respiratory-rate/page.tsx

@@ -5,7 +5,7 @@ import { Wind } from "lucide-react";
 import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page";
 
 /**
- * v1.7.0 — `/insights/atemfrequenz`.
+ * v1.7.0 — `/insights/respiratory-rate`.
  *
  * RESPIRATORY_RATE sub-page. Reuses the generic HealthKitMetricPage scaffold;
  * the chart daily-aggregates through the rollup read path. Empty-state

src/app/insights/resting-pulse/page.tsx

@@ -5,9 +5,9 @@ import { Heart } from "lucide-react";
 import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page";
 
 /**
- * v1.4.32 — `/insights/ruhepuls`.
+ * v1.4.32 — `/insights/resting-pulse`.
  *
- * Resting-heart-rate sub-page. Distinct from `/insights/puls` — Apple
+ * Resting-heart-rate sub-page. Distinct from `/insights/pulse` — Apple
  * Health splits the steady-state daily `restingHeartRate` value from
  * the spot `PULSE` samples logged manually or by Withings. The split
  * here mirrors that distinction so the user has a "daily floor"

src/app/insights/skin-temperature/page.tsx

@@ -5,7 +5,7 @@ import { Thermometer } from "lucide-react";
 import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page";
 
 /**
- * v1.7.0 — `/insights/hauttemperatur`.
+ * v1.7.0 — `/insights/skin-temperature`.
  *
  * SKIN_TEMPERATURE sub-page. Reuses the generic HealthKitMetricPage scaffold;
  * the chart daily-aggregates through the rollup read path. Empty-state

src/app/insights/sleep/page.tsx

@@ -13,7 +13,7 @@ import { SleepOverview } from "@/components/insights/sleep-overview";
 import { SubPageShell } from "@/components/insights/sub-page-shell";
 
 /**
- * v1.4.25 W4c — `/insights/schlaf`.
+ * v1.4.25 W4c — `/insights/sleep`.
  *
  * The Sleep sub-page surfaces the per-stage breakdown + duration trend
  * the v1.4.23 schema gained but never rendered. All charts live inside
@@ -65,7 +65,7 @@ export default function InsightsSchlafPage() {
     >
       <SleepOverview />
 
-      <MetricTargetSummary slug="schlaf" />
+      <MetricTargetSummary slug="sleep" />
 
       {/*
         v1.4.28 (BK-UI-StatusSchlaf) — the six sibling sub-pages all

src/app/insights/step-length/page.tsx

@@ -5,7 +5,7 @@ import { Footprints } from "lucide-react";
 import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page";
 
 /**
- * v1.7.0 — `/insights/schrittlaenge`.
+ * v1.7.0 — `/insights/step-length`.
  *
  * WALKING_STEP_LENGTH sub-page. Reuses the generic HealthKitMetricPage scaffold;
  * the chart daily-aggregates through the rollup read path. Empty-state

src/app/insights/vascular-age/page.tsx

@@ -5,7 +5,7 @@ import { HeartPulse } from "lucide-react";
 import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page";
 
 /**
- * v1.7.0 — `/insights/gefaessalter`.
+ * v1.7.0 — `/insights/vascular-age`.
  *
  * VASCULAR_AGE sub-page. Reuses the generic HealthKitMetricPage scaffold;
  * the chart daily-aggregates through the rollup read path. Empty-state

src/app/insights/visceral-fat/page.tsx

@@ -5,7 +5,7 @@ import { Droplets } from "lucide-react";
 import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page";
 
 /**
- * v1.7.0 — `/insights/viszeralfett`.
+ * v1.7.0 — `/insights/visceral-fat`.
  *
  * VISCERAL_FAT sub-page. Reuses the generic HealthKitMetricPage scaffold;
  * the chart daily-aggregates through the rollup read path. Empty-state

src/app/insights/walking-asymmetry/page.tsx

@@ -5,7 +5,7 @@ import { Footprints } from "lucide-react";
 import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page";
 
 /**
- * v1.7.0 — `/insights/gangasymmetrie`.
+ * v1.7.0 — `/insights/walking-asymmetry`.
  *
  * WALKING_ASYMMETRY sub-page. Reuses the generic HealthKitMetricPage scaffold;
  * the chart daily-aggregates through the rollup read path. Empty-state

src/app/insights/walking-distance/page.tsx

@@ -5,7 +5,7 @@ import { Footprints } from "lucide-react";
 import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page";
 
 /**
- * v1.7.0 — `/insights/gehstrecke`.
+ * v1.7.0 — `/insights/walking-distance`.
  *
  * WALKING_RUNNING_DISTANCE sub-page. Reuses the generic HealthKitMetricPage scaffold;
  * the chart daily-aggregates through the rollup read path. Empty-state

src/app/insights/walking-heart-rate/page.tsx

@@ -5,7 +5,7 @@ import { HeartPulse } from "lucide-react";
 import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page";
 
 /**
- * v1.7.0 — `/insights/gehpuls`.
+ * v1.7.0 — `/insights/walking-heart-rate`.
  *
  * WALKING_HEART_RATE_AVERAGE sub-page. Reuses the generic HealthKitMetricPage scaffold;
  * the chart daily-aggregates through the rollup read path. Empty-state

src/app/insights/walking-speed/page.tsx

@@ -5,7 +5,7 @@ import { Gauge } from "lucide-react";
 import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page";
 
 /**
- * v1.7.0 — `/insights/gehgeschwindigkeit`.
+ * v1.7.0 — `/insights/walking-speed`.
  *
  * WALKING_SPEED sub-page. Reuses the generic HealthKitMetricPage scaffold;
  * the chart daily-aggregates through the rollup read path. Empty-state

src/app/insights/walking-steadiness/page.tsx

@@ -5,7 +5,7 @@ import { Gauge } from "lucide-react";
 import { HealthKitMetricPage } from "@/components/insights/healthkit-metric-page";
 
 /**
- * v1.7.0 — `/insights/gangstabilitaet`.
+ * v1.7.0 — `/insights/walking-steadiness`.
  *
  * WALKING_STEADINESS sub-page. Reuses the generic HealthKitMetricPage scaffold;
  * the chart daily-aggregates through the rollup read path. Empty-state

src/app/insights/weight/page.tsx

@@ -18,7 +18,7 @@ import { SubPageShell } from "@/components/insights/sub-page-shell";
 import { buildWeightBandsFromHeight } from "@/lib/analytics/value-bands";
 
 /**
- * v1.4.25 W4 — `/insights/gewicht`.
+ * v1.4.25 W4 — `/insights/weight`.
  *
  * Routed Weight sub-page. Renders the weight chart with the user's
  * height-derived green/orange/red bands plus the per-section AI
@@ -87,7 +87,7 @@ export default function InsightsGewichtPage() {
         userTimezone={user?.timezone}
       />
 
-      <MetricTargetSummary slug="gewicht" />
+      <MetricTargetSummary slug="weight" />
 
       <InsightStatusCard
         title={t("insights.assessmentTitle")}