feat(fe-32/33/36): Google+Microsoft OAuth, OAuth callback, messages p…

[lynaDev2]

Summary
Implements Google OAuth (FE-32), Microsoft OAuth (FE-33), and the in-app /messages page (FE-36) across the frontend.

Changes

FE-32 — Google OAuth

• Added `Continue with Google` button to `LoginForm` and `RegisterPage` (Google-branded SVG, white bg per guidelines)
• Button redirects to `GET /auth/google`
• Created `/app/(auth)/oauth/callback/page.tsx` — reads `?token=` and `?refreshToken=` from URL, stores in `authStore`, redirects to `/dashboard`; on `?error=`, shows toast and redirects to `/login`
• Added `--- or ---` divider between OAuth buttons and email/password form

FE-33 — Microsoft OAuth

• Added `Continue with Microsoft` button below Google button on both auth pages (Microsoft-branded four-square SVG)
• Button redirects to `GET /auth/microsoft`
• Reuses the same `/auth/oauth/callback` page created in FE-32

FE-36 — In-app Messaging

• Created `/app/messages/page.tsx` — classic two-pane layout (thread list left, message thread right)
• Thread list: avatar, participant name, last message preview, timestamp, unread count badge
• Message thread: chronological bubbles (own right, others left), sender name, timestamp
• `New Message` button opens a modal to search members via `GET /community/members?search=`; selecting starts a new thread via `POST /messages/threads`
• Sending calls `POST /messages/threads/:id/messages` with optimistic UI
• Real-time: WebSocket `new-message` event appends messages without refresh; unread badge updates live
• Thread open calls `PATCH /messages/threads/:id/read`
• Added `Messages` link to `DashboardSidebar` + fixed missing `Lock` import

Acceptance Criteria

• Google and Microsoft OAuth buttons on login and register pages
• OAuth callback handles token storage and error redirect
• `/messages` two-pane layout with thread list and message thread
• New message modal with member search
• Optimistic send + WebSocket real-time updates
• Unread count badge updates in real time
• Messages link in sidebar

Closes #1218
Closes #1220
Closes #1226"

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