Add per-user clock style preference for the home status bar.

Original task #20: Let each user pick their own home-screen clock
style (analog/digital/minimal/etc.), persisted on the user record
and restored on login / other devices. Default = "full".

Changes:
- DB: added `clock_style varchar(30)` (nullable) to `users`
  (lib/db/src/schema/users.ts) and applied via direct ALTER TABLE
  (drizzle-kit push had unrelated interactive prompts about
  app_opens / user_sessions which were not safe to answer).
- OpenAPI: added `ClockStyle` enum (full/digital/digital-no-seconds
  /analog/minimal), `UpdateClockStyleBody`, exposed `clockStyle`
  on AuthUser and UserProfile, and added PATCH /auth/me/clock-style.
  Regenerated typed client and zod schemas.
- API: `buildAuthUser` and `buildUserProfile` include `clockStyle`;
  new authenticated endpoint updates the current user's style and
  returns the refreshed AuthUser.
- Frontend: new `Clock` component (artifacts/teaboy-os/src/
  components/clock.tsx) with five variants sharing a single `useNow`
  tick hook, plus an SVG analog clock; honors existing
  Latin-digit/locale formatting helpers. New `ClockStylePicker`
  (popover) shown in the status bar with a live preview for each
  option and optimistic update through the AuthUser query cache.
- home.tsx replaces the hard-coded clock block with `<Clock>` driven
  by `user.clockStyle`; trigger button placed next to the language
  toggle.
- i18n: added `home.clockStyle.label` and per-style option labels
  to en.json and ar.json.

Verified via e2e: register → default "full" rendered → switch to
analog → reload → analog persists → switch to minimal → time-only
renders. RTL layout + Latin digits both correct after language
toggle.

lib/api-client-react/src/generated/api.schemas.ts

@@ -65,6 +65,24 @@ export interface UpdateLanguageBody {
   language: string;
 }
 
+/**
+ * Per-user home-screen clock style preference
+ */
+export type ClockStyle = (typeof ClockStyle)[keyof typeof ClockStyle];
+
+export const ClockStyle = {
+  full: "full",
+  digital: "digital",
+  "digital-no-seconds": "digital-no-seconds",
+  analog: "analog",
+  minimal: "minimal",
+} as const;
+
+export interface UpdateClockStyleBody {
+  /** Clock style; pass null to clear and use the default */
+  clockStyle: ClockStyle | null;
+}
+
 export interface AuthUser {
   id: number;
   username: string;
@@ -74,6 +92,7 @@ export interface AuthUser {
   /** @nullable */
   displayNameEn?: string | null;
   preferredLanguage: string;
+  clockStyle?: ClockStyle | null;
   /** @nullable */
   avatarUrl?: string | null;
   isActive: boolean;
@@ -90,6 +109,7 @@ export interface UserProfile {
   /** @nullable */
   displayNameEn?: string | null;
   preferredLanguage: string;
+  clockStyle?: ClockStyle | null;
   /** @nullable */
   avatarUrl?: string | null;
   isActive: boolean;