chore(release): v1.4.15

Bumps version to 1.4.15 and adds the corresponding CHANGELOG entry
covering backup completeness, achievements UI, onboarding tour,
doctor-report v2, auto-deploy on GHCR push, empty-states sweep,
notification + integration status UI, AI hallucination guardrails,
mobile UX fixes, and the BD-Zielbereich percentage fix.

Includes the formatting drift left over by the v1.4.15 development
phases (Prettier sweep on touched files) and a typecheck fix in
`dashboard-layout.test.ts` so `pnpm typecheck`, `pnpm lint`,
`pnpm format:check`, `pnpm test`, and `pnpm test:integration` all
pass green on the release tag.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/charts/__tests__/mood-chart-aggregation.test.tsx

@@ -9,13 +9,13 @@ import { renderToStaticMarkup } from "react-dom/server";
  * exported so the contract can be locked in unit tests.
  */
 
-import {
-  aggregateMoodEntries,
-  pickMoodBucket,
-  MoodChart,
-} from "../mood-chart";
+import { aggregateMoodEntries, pickMoodBucket, MoodChart } from "../mood-chart";
 
-function dayEntries(start: string, count: number, score = 4): Array<{
+function dayEntries(
+  start: string,
+  count: number,
+  score = 4,
+): Array<{
   date: string;
   score: number;
 }> {

src/components/charts/__tests__/trend-card-7d-trend.test.tsx

@@ -53,7 +53,7 @@ describe("<TrendCard> 7-day trend label", () => {
     expect(html).toContain("7d trend");
     // Legacy avg7 short label must NOT appear in the trend variant —
     // this is the whole point of the rename.
-    expect(html).not.toContain('>7d:<');
+    expect(html).not.toContain(">7d:<");
   });
 
   it("paints the trend-label in German", () => {