Reorder and rewrite feature descriptions to highlight what actually
differentiates PinchChat: tool call visualization, GPT-like interface,
multi-session navigation. Remove generic features (markdown, file upload,
dark theme) that don't sell the product. Pragmatic tone, no fluff.
- Use logo.png as favicon (replaces emoji SVG)
- Show logo in header next to title
- Show larger logo on login screen
- Add OG image meta tag
- Add centered logo in README
- Closes feedback item #8
- CI runs build + type check on Node 18/20/22 for push & PRs
- Add CI status, license, and Node.js version badges to README
- Replace placeholder screenshot with contribution note