- Rename all .js files to .ts in assets/js/
- Add interfaces for hook state, data structures, and event payloads
- Add type annotations to function parameters and return types
- Create type declarations for vendor deps (Leaflet, Chart.js, Phoenix, topbar)
- Update tsconfig.json for strict TypeScript checking
- Update esbuild entry point to app.ts
Subtle hint appears in top-right corner (desktop only) when the
detail panel is open. Fades in when panel shows, fades out on ESC.
Hidden on mobile where the X button is more appropriate.
