Fix library view TODOs and bugs

[vibelyova]

Summary

Resolves all TODO/FIXME items in src/library.ts and fixes related bugs.

src/library.ts

• Dynamic dropdowns: Source and type filter dropdowns are now populated from actual library data instead of hardcoded options
• Copy button on mini cards: Each library card has a copy-to-clipboard button (appears on hover, bottom-left corner)
• Arrow key navigation in preview modal: Left/Right arrow keys navigate between items when the preview popup is open
• Ctrl/Cmd+F focuses search: Keyboard shortcut to jump to the search input
• Text selection fix: Clicking to select text no longer accidentally opens the preview modal
• Grid refresh bug: Fixed detached DOM element causing the grid to not re-render when the view is refreshed
• Filter/sort state preserved: Dropdown selections, search text, and tier buttons persist across view refreshes
• Battle points cleared: Status bar battle points are cleared when the library view is active

src/main.ts

• Library view now refreshes automatically after a library scan (data reload)
• Library card colors update when the default color setting changes (renderAll)
• Added refreshLibraryViews() helper for full view rebuilds (dropdowns + cards)

styles.css

• Added .bv-mini-copy styles for the hover-reveal copy button on library cards

Test plan

• Open the library view and verify source/type dropdowns reflect actual data
• Hover a mini card and click the copy button — verify YAML is copied
• Open a preview modal and press Left/Right arrow keys to navigate
• Press Ctrl/Cmd+F in the library view — search input should focus
• Select text on a mini card — modal should not open
• Change default color in settings — library card colors should update
• Refresh library (command or ribbon) — library view should update
• Verify status bar clears battle points when library view is active

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