Render the stored user avatar in the Chat Header when available while preserving the existing Profile icon fallback, navigation, accessibility label, and analytics.
Rename the global Sidebar route, UI, assets, analytics, and payment return context to Profile. Add accessible message-avatar navigation and preserve the source character across auth and logout flows.
BREAKING CHANGE: /sidebar has been removed; use /profile instead.
Remove `**...**` emphasis markers from inline comments and JSDoc blocks across
auth and chat components, machine mappers, and quota helpers. These are
plain code comments, not rendered markdown, so the bold syntax was noise.
Files touched:
- src/app/auth/components/auth-screen.tsx
- src/app/chat/components/chat-header.tsx
- src/app/chat/components/chat-screen.tsx
- chat machine mapper / quota helpers
No functional or behavioral changes.
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