Add 5 procedural LED effects, gradient presets, auto-crop min aspect ratio, static source polling optimization

New features:
- Procedural effect source type with fire, meteor, plasma, noise, and aurora algorithms
  using palette LUT system and 1D value noise generator
- 12 predefined gradient presets (rainbow, sunset, ocean, forest, fire, lava, aurora,
  ice, warm, cool, neon, pastel) selectable from a dropdown in the gradient editor
- Auto-crop filter: min aspect ratio parameter to prevent false-positive cropping
  in dark scenes on ultrawide displays

Optimization:
- Static/gradient sources without animation: stream thread sleeps 0.25s instead of
  frame_time; processor repolls at frame_time instead of 5ms (~40x fewer iterations)
- Inverted isinstance checks in routes to test for PictureColorStripSource only

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

server/src/wled_controller/api/routes/color_strip_sources.py

@@ -26,7 +26,7 @@ from wled_controller.core.capture.calibration import (
 )
 from wled_controller.core.capture.screen_capture import get_available_displays
 from wled_controller.core.processing.processor_manager import ProcessorManager
-from wled_controller.storage.color_strip_source import ColorCycleColorStripSource, GradientColorStripSource, PictureColorStripSource, StaticColorStripSource
+from wled_controller.storage.color_strip_source import PictureColorStripSource
 from wled_controller.storage.color_strip_store import ColorStripStore
 from wled_controller.storage.picture_source import ProcessedPictureSource, ScreenCapturePictureSource
 from wled_controller.storage.picture_source_store import PictureSourceStore
@@ -70,6 +70,12 @@ def _css_to_response(source, overlay_active: bool = False) -> ColorStripSourceRe
         stops=stops,
         colors=getattr(source, "colors", None),
         cycle_speed=getattr(source, "cycle_speed", None),
+        effect_type=getattr(source, "effect_type", None),
+        speed=getattr(source, "speed", None),
+        palette=getattr(source, "palette", None),
+        intensity=getattr(source, "intensity", None),
+        scale=getattr(source, "scale", None),
+        mirror=getattr(source, "mirror", None),
         description=source.description,
         frame_interpolation=getattr(source, "frame_interpolation", None),
         animation=getattr(source, "animation", None),
@@ -140,6 +146,12 @@ async def create_color_strip_source(
             animation=data.animation.model_dump() if data.animation else None,
             colors=data.colors,
             cycle_speed=data.cycle_speed,
+            effect_type=data.effect_type,
+            speed=data.speed,
+            palette=data.palette,
+            intensity=data.intensity,
+            scale=data.scale,
+            mirror=data.mirror,
         )
         return _css_to_response(source)
 
@@ -199,6 +211,12 @@ async def update_color_strip_source(
             animation=data.animation.model_dump() if data.animation else None,
             colors=data.colors,
             cycle_speed=data.cycle_speed,
+            effect_type=data.effect_type,
+            speed=data.speed,
+            palette=data.palette,
+            intensity=data.intensity,
+            scale=data.scale,
+            mirror=data.mirror,
         )
 
         # Hot-reload running stream (no restart needed for in-place param changes)
@@ -284,12 +302,12 @@ async def test_css_calibration(
         if body.edges:
             try:
                 source = store.get_source(source_id)
-                if isinstance(source, (StaticColorStripSource, GradientColorStripSource, ColorCycleColorStripSource)):
+                if not isinstance(source, PictureColorStripSource):
                     raise HTTPException(
                         status_code=400,
-                        detail="Calibration test is not applicable for this color strip source type",
+                        detail="Calibration test is only available for picture color strip sources",
                     )
-                if isinstance(source, PictureColorStripSource) and source.calibration:
+                if source.calibration:
                     calibration = source.calibration
             except ValueError as e:
                 raise HTTPException(status_code=404, detail=str(e))
@@ -330,10 +348,8 @@ async def start_css_overlay(
     """Start screen overlay visualization for a color strip source."""
     try:
         source = store.get_source(source_id)
-        if isinstance(source, (StaticColorStripSource, GradientColorStripSource, ColorCycleColorStripSource)):
-            raise HTTPException(status_code=400, detail="Overlay is not supported for this color strip source type")
         if not isinstance(source, PictureColorStripSource):
-            raise HTTPException(status_code=400, detail="Overlay only supported for picture color strip sources")
+            raise HTTPException(status_code=400, detail="Overlay is only supported for picture color strip sources")
         if not source.calibration:
             raise HTTPException(status_code=400, detail="Color strip source has no calibration configured")