feat: implement full breadcrumb path navigation in Files tab
- Add breadcrumbPath array to app state for tracking folder hierarchy - Rewrite updateBreadcrumb() to render full path: Home > folder > subfolder - Each breadcrumb segment is clickable to navigate back to that level - Current folder shown in bold (non-clickable), parent folders as links - Reset breadcrumb path on tab switch, home navigation, and initial load - Update navigateFolder/selectFolder to push to breadcrumb path - Enhanced breadcrumb CSS with hover effects and dark mode support
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