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.
Move breakpoints, fonts, and app_constants into the core directory for better organization:
- Move src/lib/breakpoints.ts to src/core/breakpoints.ts
- Move src/lib/fonts.ts to src/core/fonts.ts
- Move src/core/constants/app_constants.ts to src/core/app_constants.ts and clean up outdated comments
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