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>
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