eliminate code redundancy

Remove duplicate imports, unused legacy code, and repetitive patterns to maintain clean, organized codebases. Extract commonly used functionality into utilities and avoid code duplication through proper abstractions. Use early returns to reduce nesting and improve readability.

Examples of redundancy to eliminate:

• Duplicate imports: Remove repeated import statements like import { basename } from '@tauri-apps/api/path' appearing multiple times
• Legacy code cleanup: Remove unused variables and outdated code patterns that no longer serve a purpose
• Utility extraction: Move system-wide functionality like ID generation (jan-${(Date.now() / 1000).toFixed(0)}) into shared utilities
• Early returns: Replace nested conditionals with early returns (if (condition) return at the start of functions)
• Code duplication: Consolidate similar functionality into reusable abstractions rather than duplicating logic across multiple locations