refactor(modules): simplify SVG asset handling across modules

Enhancements:
- Add optimized night‑variant detection for weather icons using a predefined list
- Replace `Svg` usage with direct `svg_file` calls throughout the todo widget, removing redundant relative‑path logic
- Update dock and battery modules to load assets via direct paths, eliminating unnecessary `get_relative_path` calls- Introduce `WEATHER_CACHE_TIMEOUT` constant and tidy up unused imports (`WEATHER_EMOJI_MAP` removed)
- Minor formatting and structural clean‑ups that improve code readability

Bug Fixes:
- Remove dead import of `WEATHER_EMOJI_MAP` and unused constant `WEATHER_EMOJI_MAP`
- Correct syntax of `condition_em` initialization to avoid potential rendering issues

New Features:
- None.

modules/osd/components/keyboard_layout.py

@@ -1,6 +1,5 @@
 from fabric.widgets.label import Label
-from fabric.widgets.svg import Svg
-from fabric.utils import get_relative_path
+from utils.utils import svg_file
 from .base import BaseOSDContainer
 from services.keyboard_layout import KeyboardLayout
 
@@ -13,8 +12,8 @@ class KeyboardLayoutOSDContainer(BaseOSDContainer):
         self._connect_specific_signals()
 
     def _setup_specific_components(self):
-        self.osd_image = Svg(
-            get_relative_path("../../../assets/icons/misc/keyboard-layout.svg"),
+        self.osd_image = svg_file(
+            "misc/keyboard-layout.svg",
             size=(100, 100),
             name="osd-image",
             h_align="center",