Add audio sources as first-class entities, add mapped CSS type, simplify target editor for mapped sources

- Audio sources moved to separate tab with dedicated CRUD API, store, and editor modal
- New "mapped" color strip source type: assigns different CSS sources to distinct LED sub-ranges (zones)
- Mapped stream runtime with per-zone sub-streams, auto-sizing, hot-update support
- Target editor auto-collapses segments UI when mapped CSS is selected
- Delete protection for CSS sources referenced by mapped zones
- Compact header/footer layout

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/wled_controller/api/dependencies.py

@@ -8,6 +8,7 @@ from wled_controller.storage.pattern_template_store import PatternTemplateStore
 from wled_controller.storage.picture_source_store import PictureSourceStore
 from wled_controller.storage.picture_target_store import PictureTargetStore
 from wled_controller.storage.color_strip_store import ColorStripStore
+from wled_controller.storage.audio_source_store import AudioSourceStore
 from wled_controller.storage.profile_store import ProfileStore
 from wled_controller.core.profiles.profile_engine import ProfileEngine
 
@@ -19,6 +20,7 @@ _pattern_template_store: PatternTemplateStore | None = None
 _picture_source_store: PictureSourceStore | None = None
 _picture_target_store: PictureTargetStore | None = None
 _color_strip_store: ColorStripStore | None = None
+_audio_source_store: AudioSourceStore | None = None
 _processor_manager: ProcessorManager | None = None
 _profile_store: ProfileStore | None = None
 _profile_engine: ProfileEngine | None = None
@@ -73,6 +75,13 @@ def get_color_strip_store() -> ColorStripStore:
     return _color_strip_store
 
 
+def get_audio_source_store() -> AudioSourceStore:
+    """Get audio source store dependency."""
+    if _audio_source_store is None:
+        raise RuntimeError("Audio source store not initialized")
+    return _audio_source_store
+
+
 def get_processor_manager() -> ProcessorManager:
     """Get processor manager dependency."""
     if _processor_manager is None:
@@ -103,13 +112,14 @@ def init_dependencies(
     picture_source_store: PictureSourceStore | None = None,
     picture_target_store: PictureTargetStore | None = None,
     color_strip_store: ColorStripStore | None = None,
+    audio_source_store: AudioSourceStore | None = None,
     profile_store: ProfileStore | None = None,
     profile_engine: ProfileEngine | None = None,
 ):
     """Initialize global dependencies."""
     global _device_store, _template_store, _processor_manager
     global _pp_template_store, _pattern_template_store, _picture_source_store, _picture_target_store
-    global _color_strip_store, _profile_store, _profile_engine
+    global _color_strip_store, _audio_source_store, _profile_store, _profile_engine
     _device_store = device_store
     _template_store = template_store
     _processor_manager = processor_manager
@@ -118,5 +128,6 @@ def init_dependencies(
     _picture_source_store = picture_source_store
     _picture_target_store = picture_target_store
     _color_strip_store = color_strip_store
+    _audio_source_store = audio_source_store
     _profile_store = profile_store
     _profile_engine = profile_engine