refactor(web): split FileDetailsView into file-details-view module
- types.ts: FileDetailsViewProps, ActivityItem, VersionItem
- mockData.ts: MOCK_ACTIVITY, MOCK_VERSIONS, getMockFile
- useFileDetailsView.ts: hook returning file, activity, versions
- FileDetailsViewHeader, Preview, Metadata, Activity, Versions, Storage
- FileDetailsViewSkeleton for Loading state
- Layout: min-h-layout-page-sm, badge text-xs
- Imports use @/ for Storybook resolution
- Stories: Default, Loading (Skeleton)
- Re-export from FileDetailsView.tsx
Co-authored-by: Cursor <cursoragent@cursor.com>
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