🧹 [remove commented-out boilerplate in app.d.ts]

[Sparkier]

🎯 What: Removed the commented-out boilerplate interfaces (Error, Locals, PageData, PageState, Platform) inside namespace App in src/app.d.ts.
💡 Why: These commented-out interfaces are standard SvelteKit boilerplate that add visual noise. Removing them improves code readability and maintainability without affecting functionality.
✅ Verification: Verified the code compiles successfully without syntax errors, ran all formaters and lint checks (bun run check, bun run lint, bun run format) with no issues, and confirmed that all 55 tests passed successfully (bun vitest run).
✨ Result: The src/app.d.ts file is now cleaner and easier to read, with no dead boilerplate code.

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PR created automatically by Jules for task 12056788917359320481 started by @Sparkier

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