Add a persistent, resizable bottom panel to display torrent details as an
alternative to the modal popup. The panel can be enabled/disabled via user
settings and includes the following features:

Features:
- Persistent bottom panel showing torrent details (Details, Files, Peers, Trackers, MediaInfo tabs)
- Vertically resizable with height persistence (200px min, viewport-200px max)
- Configurable via Settings > User Interface > "Show details as bottom panel"
- Single-click shows panel on desktop (when enabled)
- ESC key closes panel
- Mobile devices continue using modal (responsive design)
- Panel background matches torrent list for visual consistency

Implementation:
- Add UIStore.detailsPanelHash and detailsPanelVisible state management
- Add FloodSettings.UITorrentDetailsPanel and detailsPanelHeight settings
- Create TorrentDetailsPanel and TorrentDetailsPanelResizeHandle components
- Update modal tab components to support dual-source (panel or modal)
- Add settings UI in UITab for panel configuration
- Update click handlers to respect panel setting
- Add CSS Grid layout for panel integration

Breaking Changes: None
- Default behavior shows panel (enabled by default)
- Users can disable to restore original modal-only behavior
- Mobile behavior unchanged (always uses modal)