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/static/locales/en.json

@@ -249,6 +249,7 @@
   "streams.description": "Sources define the capture pipeline. A raw source captures from a display using a capture template. A processed source applies postprocessing to another source. Assign sources to devices.",
   "streams.group.raw": "Screen Capture",
   "streams.group.processed": "Processed",
+  "streams.group.audio": "Audio",
   "streams.section.streams": "\uD83D\uDCFA Sources",
   "streams.add": "Add Source",
   "streams.add.raw": "Add Screen Capture",
@@ -365,6 +366,7 @@
   "targets.device.hint": "Select the LED device to send data to",
   "targets.device.none": "-- Select a device --",
   "targets.segments": "Segments:",
+  "targets.color_strip_source": "Color Strip Source:",
   "targets.segments.hint": "Each segment maps a color strip source to a pixel range on the LED strip. Gaps between segments stay black. A single segment with Start=0, End=0 auto-fits to the full strip.",
   "targets.segments.add": "+ Add Segment",
   "targets.segment.start": "Start:",
@@ -652,6 +654,8 @@
   "color_strip.type.effect.hint": "Procedural LED effects (fire, meteor, plasma, noise, aurora) generated in real time.",
   "color_strip.type.composite": "Composite",
   "color_strip.type.composite.hint": "Stack multiple color strip sources as layers with blend modes and opacity.",
+  "color_strip.type.mapped": "Mapped",
+  "color_strip.type.mapped.hint": "Assign different color strip sources to different LED ranges (zones). Unlike composite which blends layers, mapped places sources side-by-side.",
   "color_strip.type.audio": "Audio Reactive",
   "color_strip.type.audio.hint": "LED colors driven by real-time audio input — system audio or microphone.",
   "color_strip.composite.layers": "Layers:",
@@ -668,18 +672,22 @@
   "color_strip.composite.error.min_layers": "At least 1 layer is required",
   "color_strip.composite.error.no_source": "Each layer must have a source selected",
   "color_strip.composite.layers_count": "layers",
+  "color_strip.mapped.zones": "Zones:",
+  "color_strip.mapped.zones.hint": "Each zone maps a color strip source to a specific LED range. Zones are placed side-by-side — gaps between zones stay black.",
+  "color_strip.mapped.add_zone": "+ Add Zone",
+  "color_strip.mapped.zone_source": "Source",
+  "color_strip.mapped.zone_start": "Start LED",
+  "color_strip.mapped.zone_end": "End LED",
+  "color_strip.mapped.zone_reverse": "Reverse",
+  "color_strip.mapped.zones_count": "zones",
+  "color_strip.mapped.error.no_source": "Each zone must have a source selected",
   "color_strip.audio.visualization": "Visualization:",
   "color_strip.audio.visualization.hint": "How audio data is rendered to LEDs.",
   "color_strip.audio.viz.spectrum": "Spectrum Analyzer",
   "color_strip.audio.viz.beat_pulse": "Beat Pulse",
   "color_strip.audio.viz.vu_meter": "VU Meter",
-  "color_strip.audio.device": "Audio Device:",
-  "color_strip.audio.device.hint": "Audio input source. Loopback devices capture system audio output; input devices capture microphone or line-in.",
-  "color_strip.audio.channel": "Channel:",
-  "color_strip.audio.channel.hint": "Select which audio channel to visualize. Use Left/Right for stereo setups.",
-  "color_strip.audio.channel.mono": "Mono (L+R mix)",
-  "color_strip.audio.channel.left": "Left",
-  "color_strip.audio.channel.right": "Right",
+  "color_strip.audio.source": "Audio Source:",
+  "color_strip.audio.source.hint": "Mono audio source that provides audio data for this visualization. Create and manage audio sources in the Sources tab.",
   "color_strip.audio.sensitivity": "Sensitivity:",
   "color_strip.audio.sensitivity.hint": "Gain multiplier for audio levels. Higher values make LEDs react to quieter sounds.",
   "color_strip.audio.smoothing": "Smoothing:",
@@ -723,5 +731,39 @@
   "color_strip.palette.rainbow": "Rainbow",
   "color_strip.palette.aurora": "Aurora",
   "color_strip.palette.sunset": "Sunset",
-  "color_strip.palette.ice": "Ice"
+  "color_strip.palette.ice": "Ice",
+
+  "audio_source.title": "Audio Sources",
+  "audio_source.group.multichannel": "Multichannel",
+  "audio_source.group.mono": "Mono",
+  "audio_source.add": "Add Audio Source",
+  "audio_source.add.multichannel": "Add Multichannel Source",
+  "audio_source.add.mono": "Add Mono Source",
+  "audio_source.edit": "Edit Audio Source",
+  "audio_source.edit.multichannel": "Edit Multichannel Source",
+  "audio_source.edit.mono": "Edit Mono Source",
+  "audio_source.name": "Name:",
+  "audio_source.name.placeholder": "System Audio",
+  "audio_source.name.hint": "A descriptive name for this audio source",
+  "audio_source.type": "Type:",
+  "audio_source.type.hint": "Multichannel captures all channels from a physical audio device. Mono extracts a single channel from a multichannel source.",
+  "audio_source.type.multichannel": "Multichannel",
+  "audio_source.type.mono": "Mono",
+  "audio_source.device": "Audio Device:",
+  "audio_source.device.hint": "Audio input source. Loopback devices capture system audio output; input devices capture microphone or line-in.",
+  "audio_source.parent": "Parent Source:",
+  "audio_source.parent.hint": "Multichannel source to extract a channel from",
+  "audio_source.channel": "Channel:",
+  "audio_source.channel.hint": "Which audio channel to extract from the multichannel source",
+  "audio_source.channel.mono": "Mono (L+R mix)",
+  "audio_source.channel.left": "Left",
+  "audio_source.channel.right": "Right",
+  "audio_source.description": "Description (optional):",
+  "audio_source.description.placeholder": "Describe this audio source...",
+  "audio_source.description.hint": "Optional notes about this audio source",
+  "audio_source.created": "Audio source created",
+  "audio_source.updated": "Audio source updated",
+  "audio_source.deleted": "Audio source deleted",
+  "audio_source.delete.confirm": "Are you sure you want to delete this audio source?",
+  "audio_source.error.name_required": "Please enter a name"
 }