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Refactor: Migrate JavaScript (JS/JSX) codebase to TypeScript (TS/TSX)

Description

This issue tracks the migration of the existing JavaScript codebase to TypeScript. The goal is to introduce static typing, improve code reliability, and enhance developer productivity without altering existing functionality.

Scope of Work

  • Convert all .js files to .ts
  • Convert all .jsx files to .tsx
  • Introduce type annotations for functions, props, and state
  • Replace implicit any types with explicit typings where possible
  • Ensure compatibility with existing libraries and dependencies
  • Update build configuration to support TypeScript

Key Improvements

  • Strong type safety across the application
  • Early detection of potential bugs during development
  • Improved code readability and maintainability
  • Enhanced IDE support (auto-completion, refactoring tools)

Non-Goals

  • No feature additions
  • No UI/UX changes
  • No business logic changes

Risks / Considerations

  • Temporary use of any in complex areas (to be refined later)
  • Potential minor type mismatches during integration
  • Need for consistent type definitions across modules

Validation

  • Application builds successfully after migration
  • Existing features tested manually
  • No breaking changes observed