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/audio.py

@@ -0,0 +1,105 @@
+import math
+from fabric.audio import Audio
+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 AudioOSDContainer(BaseOSDContainer):
+    def __init__(self, window, **kwargs):
+        super().__init__(window, **kwargs)
+        self.audio = Audio()
+        self._last_volume = None
+        self._last_muted = None
+        self._setup_specific_components()
+        self._connect_specific_signals()
+
+    def _setup_specific_components(self):
+        self.osd_window_image = Svg(
+            get_relative_path("../../../config/assets/icons/volume/audio-volume.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(1, 100, 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.audio.connect("notify::speaker", self._on_speaker_changed)
+        if self.audio.speaker:
+            self._connect_speaker_signals()
+
+    def _connect_speaker_signals(self):
+        if self.audio.speaker:
+            self.audio.speaker.connect("changed", self._on_speaker_stream_changed)
+            self._sync_with_audio()
+
+    def _on_speaker_changed(self, *_):
+        self._connect_speaker_signals()
+        self.update()
+
+    def _on_speaker_stream_changed(self, *_):
+        if self.audio.speaker:
+            current_volume = round(self.audio.speaker.volume)
+            current_muted = self.audio.speaker.muted
+            if self._last_volume != current_volume or self._last_muted != current_muted:
+                self._last_volume = current_volume
+                self._last_muted = current_muted
+                self.update()
+
+    def _sync_with_audio(self):
+        if self.audio.speaker:
+            self._last_volume = round(self.audio.speaker.volume)
+            self._last_muted = self.audio.speaker.muted
+            self.scale.set_value(self._last_volume)
+            self._update_display()
+
+    def _update_display(self):
+        if not self.audio.speaker:
+            return
+
+        volume = (
+            self._last_volume
+            if self._last_volume is not None
+            else round(self.audio.speaker.volume)
+        )
+        muted = (
+            self._last_muted
+            if self._last_muted is not None
+            else self.audio.speaker.muted
+        )
+
+        display_volume = 0 if (volume == 0 or muted) else volume
+        level = (
+            0 if display_volume == 0 else min(int(math.ceil(display_volume / 33)), 3)
+        )
+
+        self.osd_window_image.set_from_file(
+            get_relative_path(
+                f"../../../config/assets/icons/volume/audio-volume-{level}.svg"
+            )
+        )
+
+        if muted or volume == 0:
+            self.scale.add_style_class("muted")
+        else:
+            self.scale.remove_style_class("muted")
+
+        self.scale.animate_value(volume)
+
+    def update(self, *_):
+        self._update_display()
+        super().update()