refactor(config): reorganize config.toml into sections

- Move all settings into [general], [dock], [panel], [switcher], [notification]
- Remove [desktop_widgets] section, move items to panel/general
- Add dot notation support to config service for nested keys
- Update all config references across codebase

src/utils/constants.py

@@ -1,34 +1,44 @@
 DEFAULT = {
-    "debug": False,
-    "dock_enabled": True,
-    "dock_auto_hide": True,
-    "dock_always_occluded": False,
-    "dock_icon_size": 52,
-    "hide_special_workspace": True,
-    "dock_hide_special_workspace_apps": True,
-    "notification_timeout": "5s",
-    "notification_ignored_apps": ["Hyprshot"],
-    "notification_limited_apps_history": ["Spotify"],
-    "imac_button": True,
-    "systray": True,
-    "control_center": True,
-    "search": True,
-    "global_menu": True,
-    "network": True,
-    "battery": True,
-    "notification_center": True,
-    "workspace_indicator": True,
-    "bluetooth": True,
-    "date_time": True,
-    "night_light_temperature": 4500,
-    "notch": True,
-    "custom_mods": True,
-    "keyboard_layouts": ["us"],
-    "switcher_live_preview": True,
-    "switcher_live_preview_delay_ms": 200,
-    "systray_ignore": ["blueman", "network"],
-    "wallpapers_dir": "src/assets/wallpaper_example/",
-    "osd": True,
-    "window_switcher": True,
-    "weather_location": "",
+    "general": {
+        "debug": False,
+        "wallpapers_dir": "src/assets/wallpaper_example/",
+        "keyboard_layouts": ["us"],
+        "weather_location": "",
+    },
+    "dock": {
+        "enabled": True,
+        "auto_hide": True,
+        "always_occluded": False,
+        "icon_size": 52,
+        "hide_special_workspace_apps": True,
+    },
+    "panel": {
+        "imac_button": True,
+        "systray": True,
+        "systray_ignore": ["blueman", "network"],
+        "control_center": True,
+        "search": True,
+        "global_menu": True,
+        "network": True,
+        "battery": True,
+        "notification_center": True,
+        "workspace_indicator": True,
+        "bluetooth": True,
+        "date_time": True,
+        "night_light_temperature": 4500,
+        "notch": True,
+        "osd": True,
+        "hide_special_workspace": True,
+        "custom_mods": True,
+    },
+    "switcher": {
+        "live_preview": True,
+        "live_preview_delay_ms": 200,
+        "window_switcher": True,
+    },
+    "notification": {
+        "timeout": "5s",
+        "ignored_apps": ["Hyprshot"],
+        "limited_apps_history": ["Spotify"],
+    },
 }