## Summary
- Closes#16
- Clear unused imports/bindings, empty `{}` prop patterns, `==` vs `===`, and hook dependency gaps across App, contexts, and pages
- Replace invalid `calc(3rem + unset)` in `index.css` so Css Minimizer no longer fails
## Test plan
- [x] `npm run build` in `llm-fe` succeeds (no ESLint / postcss-calc errors)
- [ ] Spot-check SignIn, dashboard, account, feedback, document storage pages still render
- [ ] Confirm WebSocket/message flows still work after MessageContext dep cleanupReviewed-on: #17