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/lib/auth/profile-update.ts

@@ -20,6 +20,9 @@ const extendedProfileSchema = profileSchema.extend({
     .refine(isValidTimezone, "Invalid IANA timezone")
     .optional(),
   moodReminderEnabled: z.boolean().optional(),
+  // Hour-cycle display preference. AUTO follows the locale convention,
+  // H12 forces AM/PM, H24 forces 24-hour.
+  timeFormat: z.enum(["AUTO", "H12", "H24"]).optional(),
 });
 
 export interface ApplyProfileResult {
@@ -35,6 +38,7 @@ export interface ApplyProfileResult {
     gender: string | null;
     timezone: string;
     locale: string | null;
+    timeFormat: "AUTO" | "H12" | "H24";
     moodReminderEnabled: boolean;
     // v1.7.0 — patient-identity fields. `insuranceNumber` is returned in
     // plaintext (decrypted on read by the route) so the client can render
@@ -101,6 +105,7 @@ export async function applyProfileUpdate(
   }
   if (data.locale !== undefined) updates.locale = data.locale;
   if (data.timezone !== undefined) updates.timezone = data.timezone;
+  if (data.timeFormat !== undefined) updates.timeFormat = data.timeFormat;
   if (data.moodReminderEnabled !== undefined) {
     updates.moodReminderEnabled = data.moodReminderEnabled;
   }
@@ -175,6 +180,7 @@ export async function applyProfileUpdate(
       gender: updatedUser.gender,
       timezone: updatedUser.timezone,
       locale: updatedUser.locale,
+      timeFormat: updatedUser.timeFormat ?? "AUTO",
       moodReminderEnabled: updatedUser.moodReminderEnabled,
       fullName: updatedUser.fullName,
       insurerName: updatedUser.insurerName,