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/components/insights/__tests__/metric-target-summary.test.tsx

@@ -80,7 +80,7 @@ const BP_DATA: TargetsFixture = {
 
 describe("<MetricTargetSummary>", () => {
   it("renders the numeric range + in-target share for a simple metric", () => {
-    const html = renderWith("gewicht", WEIGHT_DATA);
+    const html = renderWith("weight", WEIGHT_DATA);
     // Trailing `.0` trimmed, single-decimal kept.
     expect(html).toContain("Target: 60.1–80.9 kg");
     // round(18/24*100) = 75
@@ -88,19 +88,19 @@ describe("<MetricTargetSummary>", () => {
   });
 
   it("stitches the systolic + diastolic bands for blood pressure", () => {
-    const html = renderWith("blutdruck", BP_DATA);
+    const html = renderWith("blood-pressure", BP_DATA);
     expect(html).toContain("Target: 120–129 / 70–79 mmHg");
     expect(html).toContain("50% of logged days within target");
   });
 
   it("renders the adjust-target link to /targets", () => {
-    const html = renderWith("gewicht", WEIGHT_DATA);
+    const html = renderWith("weight", WEIGHT_DATA);
     expect(html).toContain('href="/targets"');
     expect(html).toContain("Adjust target range");
   });
 
   it("suppresses the share when the route flags insufficient data", () => {
-    const html = renderWith("gewicht", {
+    const html = renderWith("weight", {
       ...WEIGHT_DATA,
       targets: [{ ...WEIGHT_DATA.targets[0], insufficientData: true }],
     });
@@ -114,12 +114,12 @@ describe("<MetricTargetSummary>", () => {
   });
 
   it("renders nothing before the payload resolves", () => {
-    const html = renderWith("gewicht", undefined);
+    const html = renderWith("weight", undefined);
     expect(html).toBe("");
   });
 
   it("renders nothing when the matching target has no range", () => {
-    const html = renderWith("gewicht", {
+    const html = renderWith("weight", {
       ...WEIGHT_DATA,
       targets: [{ ...WEIGHT_DATA.targets[0], range: null }],
     });

src/components/insights/daily-briefing.tsx

@@ -39,23 +39,23 @@ import type {
  * through to `null` and render as a plain row (no link wrap).
  */
 const METRIC_HREF: Record<DailyBriefingKeyFinding["sourceMetric"], string | null> = {
-  bp: "/insights/blutdruck",
-  weight: "/insights/gewicht",
-  pulse: "/insights/puls",
-  mood: "/insights/stimmung",
-  compliance: "/insights/medikamente",
+  bp: "/insights/blood-pressure",
+  weight: "/insights/weight",
+  pulse: "/insights/pulse",
+  mood: "/insights/mood",
+  compliance: "/insights/medications",
   // Apple Health / GLP-1 additive metrics — no dedicated sub-page yet.
   // They render as static rows; v1.4.28 can wire each as they ship.
   hrv: null,
-  sleep: "/insights/schlaf",
+  sleep: "/insights/sleep",
   resting_hr: null,
   steps: null,
   active_energy: null,
   flights: null,
   distance: null,
-  vo2_max: "/insights/puls",
+  vo2_max: "/insights/pulse",
   body_temp: null,
-  glp1_plateau: "/insights/medikamente",
+  glp1_plateau: "/insights/medications",
 };
 
 /**

src/components/insights/insights-tab-strip.tsx

@@ -31,7 +31,7 @@ import {
  * v1.4.25 W4 — routed tab strip for `/insights`.
  *
  * Behaviour evolved from the v1.4.25 W3 scroll-anchor version: each pill
- * is now a `<Link>` to a routed sub-page (`/insights/blutdruck` …),
+ * is now a `<Link>` to a routed sub-page (`/insights/blood-pressure` …),
  * `usePathname()` decides the active pill, and the strip is mounted in
  * `src/app/insights/layout.tsx` so it persists across navigation
  * without re-rendering. The CoachDrawer is NOT mounted in this layout —
@@ -116,47 +116,47 @@ const SUB_PAGE_TABS: Record<
   { labelKey: string; metric: InsightMetric }
 > = {
   // ── vitals ──
-  blutdruck: {
+  "blood-pressure": {
     labelKey: "insights.navBloodPressure",
     metric: "BLOOD_PRESSURE_SYS",
   },
-  puls: { labelKey: "insights.navPulse", metric: "PULSE" },
-  sauerstoff: {
+  pulse: { labelKey: "insights.navPulse", metric: "PULSE" },
+  oxygen: {
     labelKey: "insights.navOxygenSaturation",
     metric: "OXYGEN_SATURATION",
   },
-  koerpertemperatur: {
+  "body-temperature": {
     labelKey: "insights.navBodyTemperature",
     metric: "BODY_TEMPERATURE",
   },
-  atemfrequenz: {
+  "respiratory-rate": {
     labelKey: "insights.navRespiratoryRate",
     metric: "RESPIRATORY_RATE",
   },
   // ── body composition ──
-  gewicht: { labelKey: "insights.navWeight", metric: "WEIGHT" },
+  weight: { labelKey: "insights.navWeight", metric: "WEIGHT" },
   bmi: { labelKey: "insights.navBmi", metric: "BMI" },
-  koerperwasser: {
+  "body-water": {
     labelKey: "insights.navTotalBodyWater",
     metric: "TOTAL_BODY_WATER",
   },
-  knochenmasse: { labelKey: "insights.navBoneMass", metric: "BONE_MASS" },
-  "fettfreie-masse": {
+  "bone-mass": { labelKey: "insights.navBoneMass", metric: "BONE_MASS" },
+  "fat-free-mass": {
     labelKey: "insights.navFatFreeMass",
     metric: "FAT_FREE_MASS",
   },
-  fettmasse: { labelKey: "insights.navFatMass", metric: "FAT_MASS" },
-  muskelmasse: { labelKey: "insights.navMuscleMass", metric: "MUSCLE_MASS" },
-  viszeralfett: {
+  "fat-mass": { labelKey: "insights.navFatMass", metric: "FAT_MASS" },
+  "muscle-mass": { labelKey: "insights.navMuscleMass", metric: "MUSCLE_MASS" },
+  "visceral-fat": {
     labelKey: "insights.navVisceralFat",
     metric: "VISCERAL_FAT",
   },
-  magermasse: {
+  "lean-body-mass": {
     labelKey: "insights.navLeanBodyMass",
     metric: "LEAN_BODY_MASS",
   },
   // ── activity ──
-  "aktive-energie": {
+  "active-energy": {
     labelKey: "insights.navActiveEnergy",
     metric: "ACTIVE_ENERGY_BURNED",
   },
@@ -164,85 +164,85 @@ const SUB_PAGE_TABS: Record<
   // availability helper reads `inputs.hasWorkouts` rather than a
   // `summaries[…].count`.
   workouts: { labelKey: "insights.navWorkouts", metric: "WORKOUTS" },
-  stockwerke: {
+  "flights-climbed": {
     labelKey: "insights.navFlightsClimbed",
     metric: "FLIGHTS_CLIMBED",
   },
-  gehstrecke: {
+  "walking-distance": {
     labelKey: "insights.navWalkingRunningDistance",
     metric: "WALKING_RUNNING_DISTANCE",
   },
-  gangstabilitaet: {
+  "walking-steadiness": {
     labelKey: "insights.navWalkingSteadiness",
     metric: "WALKING_STEADINESS",
   },
-  gehpuls: {
+  "walking-heart-rate": {
     labelKey: "insights.navWalkingHeartRateAverage",
     metric: "WALKING_HEART_RATE_AVERAGE",
   },
-  gangasymmetrie: {
+  "walking-asymmetry": {
     labelKey: "insights.navWalkingAsymmetry",
     metric: "WALKING_ASYMMETRY",
   },
-  doppelstandphase: {
+  "double-support-time": {
     labelKey: "insights.navWalkingDoubleSupport",
     metric: "WALKING_DOUBLE_SUPPORT",
   },
-  schrittlaenge: {
+  "step-length": {
     labelKey: "insights.navWalkingStepLength",
     metric: "WALKING_STEP_LENGTH",
   },
-  gehgeschwindigkeit: {
+  "walking-speed": {
     labelKey: "insights.navWalkingSpeed",
     metric: "WALKING_SPEED",
   },
   // ── sleep ──
-  schlaf: { labelKey: "insights.navSleep", metric: "SLEEP_DURATION" },
+  sleep: { labelKey: "insights.navSleep", metric: "SLEEP_DURATION" },
   // ── cardiovascular ──
-  ruhepuls: {
+  "resting-pulse": {
     labelKey: "insights.navRestingHr",
     metric: "RESTING_HEART_RATE",
   },
   hrv: { labelKey: "insights.navHrv", metric: "HEART_RATE_VARIABILITY" },
-  pulswellengeschwindigkeit: {
+  "pulse-wave-velocity": {
     labelKey: "insights.navPulseWaveVelocity",
     metric: "PULSE_WAVE_VELOCITY",
   },
-  gefaessalter: {
+  "vascular-age": {
     labelKey: "insights.navVascularAge",
     metric: "VASCULAR_AGE",
   },
   // ── hearing ──
-  laermbelastung: {
+  "environmental-audio": {
     labelKey: "insights.navAudioExposureEnv",
     metric: "AUDIO_EXPOSURE_ENV",
   },
-  kopfhoererpegel: {
+  "headphone-audio": {
     labelKey: "insights.navAudioExposureHeadphone",
     metric: "AUDIO_EXPOSURE_HEADPHONE",
   },
-  laermereignisse: {
+  "audio-events": {
     labelKey: "insights.navAudioExposureEvent",
     metric: "AUDIO_EXPOSURE_EVENT",
   },
   // ── environment ──
-  tageslicht: {
+  daylight: {
     labelKey: "insights.navTimeInDaylight",
     metric: "TIME_IN_DAYLIGHT",
   },
   // ── metabolic ──
-  blutzucker: {
+  "blood-glucose": {
     labelKey: "insights.navBloodGlucose",
     metric: "BLOOD_GLUCOSE",
   },
-  hauttemperatur: {
+  "skin-temperature": {
     labelKey: "insights.navSkinTemperature",
     metric: "SKIN_TEMPERATURE",
   },
   // ── mood ──
-  stimmung: { labelKey: "insights.navMood", metric: "MOOD" },
+  mood: { labelKey: "insights.navMood", metric: "MOOD" },
   // ── events ──
-  medikamente: { labelKey: "insights.navMedication", metric: "MEDICATION" },
+  medications: { labelKey: "insights.navMedication", metric: "MEDICATION" },
 };
 
 /**
@@ -409,7 +409,7 @@ function InsightsTabStripImpl({
             if (tab.kind === "link") {
               // The overview pill matches the mother page exactly; the
               // sub-page pills match a prefix so future nested routes
-              // (e.g. `/insights/schlaf/2026-05-11`) still highlight the
+              // (e.g. `/insights/sleep/2026-05-11`) still highlight the
               // parent tab.
               const isActive =
                 tab.href === INSIGHTS_OVERVIEW_PATH

src/components/insights/metric-target-summary.tsx

@@ -67,17 +67,17 @@ interface TargetsResponse {
  * component renders nothing for them, so the sub-page collapses cleanly.
  */
 const SLUG_TO_TARGET_TYPE: Record<string, string> = {
-  blutdruck: "BLOOD_PRESSURE",
-  gewicht: "WEIGHT",
+  "blood-pressure": "BLOOD_PRESSURE",
+  weight: "WEIGHT",
   bmi: "BMI",
-  puls: "PULSE",
-  schlaf: "SLEEP_DURATION",
-  stimmung: "MOOD_SCORE",
-  medikamente: "MEDICATION_COMPLIANCE",
+  pulse: "PULSE",
+  sleep: "SLEEP_DURATION",
+  mood: "MOOD_SCORE",
+  medications: "MEDICATION_COMPLIANCE",
 };
 
 interface MetricTargetSummaryProps {
-  /** Insights category slug, e.g. `"blutdruck"`. */
+  /** Insights category slug, e.g. `"blood-pressure"`. */
   slug: string;
 }
 

src/components/insights/therapy-timeline.tsx

@@ -11,7 +11,7 @@ import {
 } from "@/lib/medications/injection-sites";
 
 /**
- * v1.4.25 W4d — therapy-timeline view for /insights/medikamente.
+ * v1.4.25 W4d — therapy-timeline view for /insights/medications.
  *
  * Renders a chronological list of GLP-1 therapy events: dose changes,
  * injections (with site if recorded), inventory events, side-effect tag

src/components/insights/vo2-max-chart-row.tsx

@@ -9,7 +9,7 @@ import { cn } from "@/lib/utils";
 import { HealthChartDynamic } from "@/components/charts/health-chart-dynamic";
 
 /**
- * v1.4.25 W16a — VO2 max chart-row card for `/insights/puls`.
+ * v1.4.25 W16a — VO2 max chart-row card for `/insights/pulse`.
  *
  * The dashboard already carries an opt-in VO2 max trend tile (W8d.5);
  * this is the deeper Insights surface. Renders one HealthChart for the