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/osd/components/brightness.py

@@ -0,0 +1,64 @@
+import math
+from services.brightness import Brightness
+from fabric.utils import get_relative_path
+from fabric.widgets.svg import Svg
+from fabric.widgets.scale import ScaleMark
+from .animated_scale import AnimatedScale
+from .base import BaseOSDContainer
+
+
+class BrightnessOSDContainer(BaseOSDContainer):
+    def __init__(self, window, **kwargs):
+        super().__init__(window, **kwargs)
+        self.brightness_service = Brightness.get_initial()
+        self._setup_specific_components()
+        self._connect_specific_signals()
+
+    def _setup_specific_components(self):
+        self.osd_window_image = Svg(
+            get_relative_path("../../../config/assets/icons/brightness/brightness.svg"),
+            size=(100, 100),
+            name="osd-image",
+            h_align="center",
+            v_align="center",
+            h_expand=True,
+            v_expand=True,
+        )
+        self.scale = AnimatedScale(
+            marks=(ScaleMark(value=i) for i in range(0, 101, 10)),
+            value=70,
+            min_value=0,
+            max_value=100,
+            increments=(1, 1),
+            orientation="h",
+        )
+        self.add(self.osd_window_image)
+        self.add(self.scale)
+
+    def _connect_specific_signals(self):
+        self.brightness_service.connect("screen", self._on_screen_brightness_changed)
+
+    def _on_screen_brightness_changed(self, _sender, value, *_args):
+        self.update()
+
+    def _get_normalized_brightness(self):
+        return (
+            self.brightness_service.screen_brightness
+            / self.brightness_service.max_screen
+        ) * 100
+
+    def _update_display(self):
+        normalized = self._get_normalized_brightness()
+        level = 0 if normalized == 0 else min(int(math.ceil(normalized / 33)), 3)
+
+        self.osd_window_image.set_from_file(
+            get_relative_path(
+                f"../../../config/assets/icons/brightness/brightness-{level}.svg"
+            )
+        )
+
+        self.scale.animate_value(normalized)
+
+    def update(self, *_):
+        self._update_display()
+        super().update()