perf(FancyCursor): optimize mousemove handler with ticking pattern

- Replaces the `cancelAnimationFrame` pattern with a boolean ticking flag to reduce function allocation and RAF overhead on high-frequency mousemove events.
- Uses closure variables for coordinates to ensure the latest position is used in the animation frame.
- Improves performance of the custom cursor on high-refresh-rate input devices.

.jules/bolt.md

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+## 2024-05-22 - Missing Scripts and Environment
+**Learning:** The project lacks `lint` script in `package.json`. Running `pnpm lint` might invoke system tools (like Android Lint?) instead of failing or doing nothing useful. Always check `package.json` scripts first.
+**Action:** Use specific commands like `pnpm exec tsc --noEmit` or `npx vitest` as discovered/documented, rather than assuming standard scripts exist.