fix(10-04): prettier format + remove unnecessary type assertions

- Run prettier on all new/modified PWA files (CredentialSheet, SetupBanner, AdminPage, admin.spec.ts)
- Remove unnecessary 'as React.RefObject<HTMLElement | null>' casts flagged by @typescript-eslint/no-unnecessary-type-assertion
- Format pre-existing API files from Plans 02/03 (me.ts, user.test.ts, requireAdmin.test.ts, me.test.ts)
- All 270 API tests + 191 PWA vitest tests pass; lint/typecheck/build clean

apps/api/tests/lib/requireAdmin.test.ts

@@ -24,7 +24,13 @@ vi.mock('../../src/db/client.js', () => ({
 
 // Bring in the ContextVariableMap augmentation (sets up c.get('user') typing)
 vi.mock('../../src/auth/devBypass.js', () => ({
-  DEV_USER: { id: 1, oidcIss: 'dev', oidcSub: 'dev-user', displayName: 'Dev User', color: '#4A90D9' },
+  DEV_USER: {
+    id: 1,
+    oidcIss: 'dev',
+    oidcSub: 'dev-user',
+    displayName: 'Dev User',
+    color: '#4A90D9',
+  },
   devAuthBypass: () => async (_c: unknown, next: () => Promise<void>) => next(),
   COLOR_PALETTE: ['#4A90D9'],
 }));