Move config to ~/.config/neo-pod-desktop/config.ini with migration

- Config is now in XDG_CONFIG_HOME (~/.config/) for write access in AppImage
- Auto-migrates existing config.ini from project root on first run
- Creates directory on save() if not exists

src/config_loader.py

@@ -25,12 +25,11 @@ class ConfigLoader:
         Args:
             config_file: Path to configuration file (optional)
         """
-        # Default config file is in the project root directory
         if not config_file:
             self.config_file = os.path.join(
-                os.path.dirname(os.path.dirname(os.path.abspath(__file__))),
-                "config.ini"
+                os.path.expanduser("~"), ".config", "neo-pod-desktop", "config.ini"
             )
+            self._migrate_old_config()
         else:
             self.config_file = config_file
 
@@ -39,6 +38,17 @@ class ConfigLoader:
         # Load configuration
         self.load()
 
+    def _migrate_old_config(self):
+        """Migrate config from old project-root location to XDG config dir."""
+        old_path = os.path.join(
+            os.path.dirname(os.path.dirname(os.path.abspath(__file__))),
+            "config.ini"
+        )
+        if os.path.exists(old_path) and not os.path.exists(self.config_file):
+            logger.info("Migrating config from %s to %s", old_path, self.config_file)
+            os.makedirs(os.path.dirname(self.config_file), exist_ok=True)
+            os.rename(old_path, self.config_file)
+    
     def load(self) -> bool:
         """
         Load configuration from file
@@ -69,6 +79,7 @@ class ConfigLoader:
         """
         try:
             logger.info(f"Saving configuration to {self.config_file}")
+            os.makedirs(os.path.dirname(self.config_file), exist_ok=True)
 
             with open(self.config_file, 'w') as f:
                 self.config.write(f)