feat: UI overhaul with sidebar, dashboard, and channel views

[wowitsjack]

Full source available at FredTV-Next, my personal fork with all features integrated.

Summary

Major UI redesign introducing sidebar navigation, a dashboard home view, multiple channel display modes (grid/list), a search overlay, channel detail panel, and now-playing bar.

Dependencies

Stacked on #393 (feat/inline-player) and #392 (feat/recording-system). Merge those first, then this PR's diff auto-narrows to just the UI changes.

New components (10)

• Sidebar - collapsible nav with home/all/categories/favorites/history/hidden/sources
• Dashboard - home view with content rows (recently watched, favorites, by source)
• Search overlay - Ctrl+K instant search with keyboard navigation
• Channel detail panel - slide-out info panel for any channel
• Now-playing bar - persistent mini controls at bottom when something is playing
• Channel card - grid view with thumbnail, type badge, favorite icon
• Channel list row - table/list view with columns
• Content row - horizontal scrollable card row (used by dashboard)
• View density toggle - grid large / grid compact / list switcher
• View density toggle - in home toolbar

New models

• SidebarNavEvent - sidebar navigation event type
• ViewDensity - GridLarge / GridCompact / List enum

Modified files

• App shell - sidebar + main content layout, global progress bar, Ctrl+K shortcut
• Home - grid/list views, skeleton loading, empty states, sidebar nav subscriptions, dynamic grid columns
• Settings - complete card-based redesign with sections (Playback, Storage, Interface, Network, Sources)
• Memory service - sidebar state, view density, channel detail, search overlay subjects
• Channel tile - showInfo(), favPop animation, CSS variable gradients
• EPG modal - inline player integration, design polish
• Download manager - design token migration
• styles.css - sidebar layout vars, material menu overrides, modal animation, toastr dark theme, btn-spinner

Test plan

• Sidebar shows on home route, hidden on settings
• Sidebar collapse/expand persists across page nav
• Dashboard shows recently watched and favorites rows
• Ctrl+K opens search overlay, type to search, Enter/click to play
• Grid large / grid compact / list view modes work
• Channel detail panel opens from right-click > Info
• Now-playing bar shows when a channel is playing
• Settings page renders with new card layout
• Skeleton loading appears while channels load
• Empty states show for favorites/history/hidden when empty
• npx ng build passes

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[wowitsjack]

THis bot omfg D;

Finally it works

[wowitsjack]

Superseded by #396 + #397 which contribute the full FredTV-Next codebase as a proper 2-part stack.