Delete web/src/types/htmx.d.ts - HTMX is already declared in web/src/alpine.ts.
Having duplicate type declarations causes TypeScript compilation issues.
The Window interface extension in alpine.ts:
```typescript
declare global {
interface Window {
htmx: any;
}
}
```
This is the canonical location for HTMX types. Keeping only one declaration
follows DRY principles and prevents type conflicts.