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.

Cargo.toml

@@ -0,0 +1,46 @@
+[package]
+name = "driftwood"
+version = "0.1.0"
+edition = "2021"
+license = "GPL-3.0-or-later"
+
+[dependencies]
+gtk = { version = "0.11", package = "gtk4", features = ["v4_16"] }
+adw = { version = "0.9", package = "libadwaita", features = ["v1_6"] }
+glib = "0.22"
+gio = "0.22"
+
+# Database
+rusqlite = { version = "0.33", features = ["bundled"] }
+
+# CLI
+clap = { version = "4", features = ["derive"] }
+
+# File hashing
+sha2 = "0.10"
+
+# Time
+chrono = "0.4"
+
+# XDG directories
+dirs = "6"
+
+# Human-readable sizes
+humansize = "2"
+
+# HTTP client (sync, lightweight - for update checks)
+ureq = { version = "3", features = ["json"] }
+
+# JSON parsing
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+
+# Logging
+log = "0.4"
+env_logger = "0.11"
+
+# Temp directories (for AppImage extraction)
+tempfile = "3"
+
+[build-dependencies]
+glib-build-tools = "0.22"