Implement Workstream I: Account pages with code review fixes

Add account management UI with profile settings, authentication options,
device/passkey management, and session management pages.

Key changes:
- Add account pages: profile, auth, devices, sessions
- Add dialog components: confirm, add-passkey, change-password, rename-passkey
- Return passkeyId from verifyRegistration to fix race condition
- Add hasPassword field to user schema
- Add aria-label to dialog close button for accessibility
- Add avatar URL validation and fix phone input styling
- Add comprehensive test plan documentation

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/api-contract/src/contract.ts

@@ -88,7 +88,7 @@ export const contract = oc.router({
             response: z.custom<RegistrationResponseJSON>(),
           }),
         )
-        .output(z.void()),
+        .output(z.object({ passkeyId: z.number() })),
       createAuthenticationOptions: oc.output(
         z.object({
           challengeId: z.number(),