Vendors canvas-confetti 1.9.3 and wires an ImportConfetti hook on the
alert-success banner that /imports/:id already renders when
run.status == "complete". The hook uses the "realistic look" preset
from confetti.js.org and runs on mount, so it fires exactly once —
when the banner first appears.
- 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
