Implement Driftwood AppImage manager - Phases 1 and 2

Phase 1 - Application scaffolding:
- GTK4/libadwaita application window with AdwNavigationView
- GSettings-backed window state persistence
- GResource-compiled CSS and schema
- Library view with grid/list toggle, search, sorting, filtering
- Detail view with file info, desktop integration controls
- Preferences window with scan directories, theme, behavior settings
- CLI with list, scan, integrate, remove, clean, inspect commands
- AppImage discovery, metadata extraction, desktop integration
- Orphaned desktop entry detection and cleanup
- AppImage packaging script

Phase 2 - Intelligence layer:
- Database schema v2 with migration for status tracking columns
- FUSE detection engine (libfuse2/3, fusermount, /dev/fuse, AppImageLauncher)
- Wayland awareness engine (session type, toolkit detection, XWayland)
- Update info parsing from AppImage ELF sections (.upd_info)
- GitHub/GitLab Releases API integration for update checking
- Update download with progress tracking and atomic apply
- Launch wrapper with FUSE auto-detection and usage tracking
- Duplicate and multi-version detection with recommendations
- Dashboard with system health, library stats, disk usage
- Update check dialog (single and batch)
- Duplicate resolution dialog
- Status badges on library cards and detail view
- Extended CLI: status, check-updates, duplicates, launch commands

49 tests passing across all modules.

data/resources/style.css

@@ -0,0 +1,72 @@
+/* Status badges */
+.status-badge {
+    border-radius: 8px;
+    padding: 2px 8px;
+    font-size: 8pt;
+    font-weight: 600;
+}
+
+.status-badge.success {
+    background: @success_bg_color;
+    color: @success_fg_color;
+}
+
+.status-badge.warning {
+    background: @warning_bg_color;
+    color: @warning_fg_color;
+}
+
+.status-badge.error {
+    background: @error_bg_color;
+    color: @error_fg_color;
+}
+
+.status-badge.info {
+    background: @accent_bg_color;
+    color: @accent_fg_color;
+}
+
+.status-badge.neutral {
+    background: @card_shade_color;
+    color: @window_fg_color;
+}
+
+/* App cards in grid view */
+.app-card {
+    padding: 12px;
+    border-radius: 12px;
+    background: @card_bg_color;
+    transition: background 150ms ease;
+}
+
+.app-card:hover {
+    background: @headerbar_shade_color;
+}
+
+.app-card-name {
+    font-weight: 600;
+    font-size: 10pt;
+}
+
+.app-card-version {
+    font-size: 8pt;
+    opacity: 0.7;
+}
+
+/* Badge row in app cards */
+.badge-row {
+    margin-top: 4px;
+}
+
+/* Detail view headings */
+.heading {
+    font-weight: 700;
+    font-size: 11pt;
+    opacity: 0.8;
+}
+
+/* Monospace text for paths and hashes */
+.monospace {
+    font-family: monospace;
+    font-size: 9pt;
+}