feat: Add customizable accent color setting

Introduce an accent color preference across the app: add a settings UI input (with restart note), persist it to AppState and config (read/write), and accept it in save_settings. Integrate the value into theming: compute a semi-transparent selection color, apply it to table selection styles, and pass it to qdarktheme as the primary color (including when window transparency is enabled). Also apply the accent to the tracker combo selection styling as a UI polish.

src/utils/config/config.py

@@ -14,7 +14,8 @@ def create_config():
         "debug": str(state.debug),
         "ignore_updates": str(state.ignore_updates),
         "autoresume": str(state.autoresume),        
-        "window_transparency": str(state.window_transparency)
+        "window_transparency": str(state.window_transparency),
+        "accent_color": str(state.accent_color)
     }
 
     config["Network"] = {
@@ -84,6 +85,7 @@ def read_config():
         state.ignore_updates = config.getboolean("General", "ignore_updates", fallback=state.ignore_updates)
         state.autoresume = config.getboolean("General", "autoresume", fallback=state.autoresume)
         state.window_transparency = config.getboolean("General", "window_transparency", fallback=state.window_transparency)
+        state.accent_color = config.get("General", "accent_color", fallback=state.accent_color)
 
         # Network
         state.api_url = config.get("Network", "api_url", fallback=state.api_url)

src/utils/config/settings.py

@@ -5,7 +5,7 @@ from utils.data.state import state
 
 
 
-def save_settings(close=lambda: None, apiurl=None, download_path=None, down_speed_limit=None, up_speed_limit=None, image_path=None, autoresume=None, max_connections=None, max_downloads=None, bound_interface=None, image_width=None, image_offset=None, image_opacity=None, image_as_wallpaper=None, image_position=None):
+def save_settings(close=lambda: None, apiurl=None, download_path=None, down_speed_limit=None, up_speed_limit=None, image_path=None, autoresume=None, max_connections=None, max_downloads=None, bound_interface=None, image_width=None, image_offset=None, image_opacity=None, image_as_wallpaper=None, image_position=None, accent_color=None):
     if apiurl is not None:
         state.api_url = apiurl
     if download_path is not None:
@@ -34,6 +34,8 @@ def save_settings(close=lambda: None, apiurl=None, download_path=None, down_spee
         state.image_as_wallpaper = image_as_wallpaper
     if image_position is not None:
         state.image_position = image_position
+    if accent_color is not None:
+        state.accent_color = accent_color
 
     update_settings() # Update LibTorrent Session Settings
     consoleLog("Saved Settings")

src/utils/data/state.py

@@ -25,6 +25,7 @@ class AppState(QObject):
 
         # GUI
         self.window_transparency: bool = False
+        self.accent_color: str = ""
         self.trackertable: QTableWidget
         self.interfaces: List = []
         self.active_interfaces: List = []