feat(settings): a time-format preference and one home for insight pills

The clock format followed the UI language with no way out — an English
interface forced AM/PM everywhere. A new profile preference (automatic,
24-hour, 12-hour) feeds every formatter through the shared locale
context, persists on the user row and rides the profile endpoints. The
insight pill list in settings gains the same eye toggle the overview
tiles have, so ordering and visibility live in one place; the page-side
'manage detail pages' block folds into a link there. Includes the
locale bundles for both features and the regenerated API contract.

src/app/api/user/profile/__tests__/route.test.ts

@@ -200,4 +200,50 @@ describe("PATCH /api/user/profile", () => {
     expect(res.status).toBe(422);
     expect(prisma.user.update).not.toHaveBeenCalled();
   });
+
+  // v1.15.20 — hour-cycle display preference rides the shared profile
+  // update path: a valid enum value persists field-by-field and echoes
+  // back; anything outside AUTO/H12/H24 is rejected by the Zod schema.
+  it("persists a valid timeFormat and echoes it back", async () => {
+    vi.mocked(getSession).mockResolvedValue(SESSION_OK as never);
+    vi.mocked(prisma.user.findUnique).mockResolvedValue(null);
+    vi.mocked(prisma.user.update).mockResolvedValue({
+      id: "user-1",
+      username: "marc",
+      displayName: null,
+      email: null,
+      role: "USER",
+      heightCm: null,
+      dateOfBirth: null,
+      gender: null,
+      timezone: "Europe/Berlin",
+      locale: null,
+      timeFormat: "H24",
+      moodReminderEnabled: false,
+      fullName: null,
+      insurerName: null,
+      insurerIkNumber: null,
+      insuranceNumberEncrypted: null,
+    } as never);
+
+    const res = await PATCH(req({ timeFormat: "H24" }));
+    expect(res.status).toBe(200);
+    expect(prisma.user.update).toHaveBeenCalledWith(
+      expect.objectContaining({
+        where: { id: "user-1" },
+        data: expect.objectContaining({ timeFormat: "H24" }),
+      }),
+    );
+    const body = (await res.json()) as {
+      data: { timeFormat: string };
+    };
+    expect(body.data.timeFormat).toBe("H24");
+  });
+
+  it("returns 422 for an invalid timeFormat", async () => {
+    vi.mocked(getSession).mockResolvedValue(SESSION_OK as never);
+    const res = await PATCH(req({ timeFormat: "12h" }));
+    expect(res.status).toBe(422);
+    expect(prisma.user.update).not.toHaveBeenCalled();
+  });
 });

src/app/api/user/profile/route.ts

@@ -36,6 +36,7 @@ export const GET = apiHandler(async () => {
       heightCm: true,
       locale: true,
       timezone: true,
+      timeFormat: true,
       moodReminderEnabled: true,
       fullName: true,
       insurerName: true,
@@ -64,6 +65,7 @@ export const GET = apiHandler(async () => {
     heightCm: dbUser?.heightCm ?? null,
     locale: dbUser?.locale ?? null,
     timezone: dbUser?.timezone ?? "Europe/Berlin",
+    timeFormat: dbUser?.timeFormat ?? "AUTO",
     moodReminderEnabled: dbUser?.moodReminderEnabled ?? false,
     fullName: dbUser?.fullName ?? null,
     insurerName: dbUser?.insurerName ?? null,
@@ -96,6 +98,7 @@ export const PATCH = apiHandler(async (request: NextRequest) => {
     heightCm: result.user.heightCm,
     locale: result.user.locale,
     timezone: result.user.timezone,
+    timeFormat: result.user.timeFormat,
     moodReminderEnabled: result.user.moodReminderEnabled,
     fullName: result.user.fullName,
     insurerName: result.user.insurerName,