refactor: clean up animations and simplify logic in BackgroundAnimation & AnimatedSection

- Removed unused  and redundant code in BackgroundAnimation
- Consolidated logic, reduced Rust code blocks from 12 to 8 for better perf
- Renamed variables for clarity and standardized formatting

- In animatedsection.tsx:
  - Removed unnecessary state, refs, and complex timeout/animation tracking
  - Simplified cleanup logic using a single array
  - Consolidated duplicate selectors and removed redundant checks
  - Removed over-engineered scroll and animation queuing logic

- chore: upgraded TailwindCSS from v3 to v4 for latest features and future-proofing

Author: Amitminer