Migrate to AGS v3 with colorshell configuration

- Updated AGS from v1 to v3 with Astal integration
- Integrated colorshell desktop shell (without app runner)
- Added all required Astal packages (apps, auth, battery, bluetooth, etc.)
- Disabled runner module (using Vicinae launcher instead)
- Disabled dunst (colorshell handles notifications)
- Fixed colorshell dependencies: gresource, pywal colors, uwsm
- Patched colorshell to work with NixOS paths
- Added build tools: pnpm, glib.dev for gresource compilation
- Created default pywal color scheme (Catppuccin-based)
- Set XDG_CACHE_HOME in Hyprland environment
- Fixed path resolution for cache directories

Colorshell is now running with styled bar on both monitors

home/hyprland.nix

@@ -20,8 +20,8 @@
         "mpvpaper -o 'no-audio loop' DP-2 ~/nix-flake/assets/wallpaper.mp4"
         "mpvpaper -o 'no-audio loop' DP-1 ~/nix-flake/assets/wallpaper.mp4"
         
-        "ags run"          # Start AGS (bar and widgets)
-        "dunst"
+        "ags run --gtk 4"  # Start AGS with colorshell (includes notification daemon)
+        # "dunst"          # Disabled - colorshell handles notifications
         "nm-applet --indicator"  # WiFi manager in system tray
         "vicinae server"         # Start Vicinae server
       ];
@@ -34,6 +34,9 @@
         "HYPRCURSOR_SIZE,24"
         "QT_QPA_PLATFORMTHEME,qt5ct"
         
+        # XDG directories for colorshell
+        "XDG_CACHE_HOME,$HOME/.cache"
+        
         # NVIDIA specific environment variables
         "LIBVA_DRIVER_NAME,nvidia"           # Hardware acceleration
         "GBM_BACKEND,nvidia-drm"             # Force GBM backend