🧹 Code Health: Remove explicit 'any' from Window object references

[kuasar-mknd]

🎯 What: Addressed a typing code health issue where the global window object was being explicitly cast to any (via const win = window as any;) with accompanying eslint-disable comments.
💡 Why: Extending the global Window interface with the specific singleton properties used across the application ensures true type-safety during the build and prevents regressions. It cleans up unnecessary code duplication (the any casts) and removes ESLint warning overrides.
✅ Verification: Ran pnpm run check which checks linting, formatting, and Astro typechecking. Confirmed there were zero typescript errors or lint warnings. Followed up by running the playwright end-to-end tests to ensure functionality remained unbroken.
✨ Result: A safer, cleaner, and fully typed pattern for global object access without resorting to any.

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PR created automatically by Jules for task 13287509590737774229 started by @kuasar-mknd

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