🧹 Code Health: Remove explicit 'any' type for Window object

[kuasar-mknd]

🎯 What: Removed explicit any casting for Window objects (const win = window as any;) throughout the .astro files.

💡 Why: By using the explicit type any on window, we were abandoning TypeScript's type-safety benefits. Extending the Window interface properly inside src/env.d.ts with custom properties enables safe global state usage and removes lint disabling directives (// eslint-disable-next-line @typescript-eslint/no-explicit-any). This vastly improves the codebase's readability and correctness without changing existing behaviors.

✅ Verification:

1. Ran format and lint tests (pnpm run lint) to ensure the codebase abides by existing rules.
2. Ran pnpm run typecheck (astro check) and verified 0 errors.
3. Re-built the website and successfully executed the full Playwright End-to-End suite to confirm interactive functionalities utilizing window state were unaffected.

✨ Result: Safe, type-checked implementations globally in all UI components and layouts utilizing the custom interactive variables mapped to window.

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PR created automatically by Jules for task 4819259879335121778 started by @kuasar-mknd

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