🧹 [code health improvement] Fix 'any' typing in VideoPlayer by augmenting Window interface

[kuasar-mknd]

🎯 What: The code health issue addressed was the use of // eslint-disable-next-line @typescript-eslint/no-explicit-any and window as any in src/components/features/projects/VideoPlayer.astro to bypass TypeScript rules for custom event handlers. Replaced any with strongly typed augmentations to the Window interface in src/env.d.ts (__videoPlayerClickHandler, __videoPrefetchDelegationInitialized, _plyrPrefetched, __videoPlayerLoadHandler).

💡 Why: Relying on any bypasses TypeScript's safety mechanisms and makes the code harder to maintain. Properly typing the window object enforces type safety for singleton listener patterns.

✅ Verification: Verified by running the local validation suite (pnpm run check, pnpm run build, and pnpm run test:e2e). All formatting, linting, typechecks, builds, and tests passed.

✨ Result: Improved type safety and maintainability in the VideoPlayer.astro component while eliminating the need for any casting.

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PR created automatically by Jules for task 11866459605519206435 started by @kuasar-mknd

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