refactor(modules): improve exception handling and simplify service usage

Enhancements
- Replace bare `except:` with `except Exception:` in multiple modules- Cast step calculation to `int` for consistent type
- Simplify `get_battery_icon_file` to return a string directly
- Use `get_todo_service()` instead of module-level `todo_service` throughout todo widget
- Remove unused `"zen": "zen-browser"` mapping entry

Bug Fixes
- Prevent bare exception swallowing by catching `Exception` explicitly
- Ensure proper cleanup of timer IDs and other resources
- Delete unused modules/osdd components

New Features
- None

modules/controlcenter/expanded_player.py

@@ -911,7 +911,7 @@ class PlayerBox(Box):
                 from gi.repository import GLib
 
                 GLib.source_remove(self._seekbar_timer_id)
-            except:
+            except Exception:
                 pass
             self._seekbar_timer_id = None
 
@@ -1041,7 +1041,7 @@ class PlayerBox(Box):
                 from gi.repository import GLib
 
                 GLib.source_remove(self._seekbar_timer_id)
-            except:
+            except Exception:
                 pass
             self._seekbar_timer_id = None