refactor:minimap.js to ts

[ShinichiShi]

Fixes #661

Describe the changes you have made in this PR -

converting the minimap.js to ts while maintaining the logic

Screenshots of the changes (If any) -

Note: Please check Allow edits from maintainers. if you would like us to assist in the PR.

Summary by CodeRabbit

• Refactor
  • Improved minimap with stronger safety checks and safer DOM handling for more reliable rendering and lifecycle management.
  • Explicit dimension calculations and cleanup logic to prevent visual glitches and stale drawings.
• Bug Fixes
  • More predictable show/hide behavior with timestamp-based removal and smoother fade-out for a cleaner user experience.
• New
  • Added clearer lifecycle controls for updating and removing the minimap.