feat: theme settings (#38)

* feat: implement user settings management for theme and opacity preferences

* feat: add user settings management and settings window functionality

* feat: enhance command path resolution for global shortcuts

* feat: expose user settings module and manager in the library

* feat: update capabilities to include settings window support

* feat: update capability description and include settings window support

* feat: add --quiet option to application execution command

* feat: add settings window configuration to Tauri app

* feat: implement settings app for theme customization and opacity control

* feat: add --quiet option to application desktop entry

* feat: add dynamic background opacity settings for light and dark modes

* fix: remove --quiet option

* feat: update glass effect colors for dark and light modes

src-tauri/tauri.conf.json

@@ -28,6 +28,20 @@
         "skipTaskbar": true,
         "alwaysOnTop": true,
         "focus": true
+      },
+      {
+        "title": "Settings - Clipboard History",
+        "label": "settings",
+        "width": 480,
+        "height": 520,
+        "resizable": false,
+        "decorations": true,
+        "transparent": false,
+        "visible": false,
+        "skipTaskbar": false,
+        "alwaysOnTop": false,
+        "center": true,
+        "focus": true
       }
     ],
     "security": {