Remove per-source speed, fix device dirty check, and add frontend caching

Speed is now exclusively controlled via sync clocks — CSS sources no longer
carry their own speed/cycle_speed fields. Streams default to 1.0× when no
clock is assigned. Also fixes false-positive dirty check on the device
settings modal (array reference comparison) and converts several frontend
modules to use DataCache for consistent API response caching.

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

server/src/wled_controller/storage/color_strip_source.py

@@ -69,7 +69,6 @@ class ColorStripSource:
             "stops": None,
             "animation": None,
             "colors": None,
-            "cycle_speed": None,
             "effect_type": None,
             "palette": None,
             "intensity": None,
@@ -149,7 +148,6 @@ class ColorStripSource:
                 id=sid, name=name, source_type="color_cycle",
                 created_at=created_at, updated_at=updated_at, description=description,
                 clock_id=clock_id, colors=colors,
-                cycle_speed=float(data.get("cycle_speed") or 1.0),
                 led_count=data.get("led_count") or 0,
             )
 
@@ -198,7 +196,6 @@ class ColorStripSource:
                 id=sid, name=name, source_type="effect",
                 created_at=created_at, updated_at=updated_at, description=description,
                 clock_id=clock_id, effect_type=data.get("effect_type") or "fire",
-                speed=float(data.get("speed") or 1.0),
                 led_count=data.get("led_count") or 0,
                 palette=data.get("palette") or "fire",
                 color=color,
@@ -340,13 +337,11 @@ class ColorCycleColorStripSource(ColorStripSource):
         [255, 0, 0], [255, 255, 0], [0, 255, 0],
         [0, 255, 255], [0, 0, 255], [255, 0, 255],
     ])
-    cycle_speed: float = 1.0  # speed multiplier; 1.0 ≈ one full cycle every 20 seconds
     led_count: int = 0  # 0 = use device LED count
 
     def to_dict(self) -> dict:
         d = super().to_dict()
         d["colors"] = [list(c) for c in self.colors]
-        d["cycle_speed"] = self.cycle_speed
         d["led_count"] = self.led_count
         return d
 
@@ -361,7 +356,6 @@ class EffectColorStripSource(ColorStripSource):
     """
 
     effect_type: str = "fire"       # fire | meteor | plasma | noise | aurora
-    speed: float = 1.0              # animation speed multiplier (0.1–10.0)
     led_count: int = 0              # 0 = use device LED count
     palette: str = "fire"           # named color palette
     color: list = field(default_factory=lambda: [255, 80, 0])  # [R,G,B] for meteor head
@@ -372,7 +366,6 @@ class EffectColorStripSource(ColorStripSource):
     def to_dict(self) -> dict:
         d = super().to_dict()
         d["effect_type"] = self.effect_type
-        d["speed"] = self.speed
         d["led_count"] = self.led_count
         d["palette"] = self.palette
         d["color"] = list(self.color)

server/src/wled_controller/storage/color_strip_store.py

@@ -106,9 +106,7 @@ class ColorStripStore:
         frame_interpolation: bool = False,
         animation: Optional[dict] = None,
         colors: Optional[list] = None,
-        cycle_speed: float = 1.0,
         effect_type: str = "fire",
-        speed: float = 1.0,
         palette: str = "fire",
         intensity: float = 1.0,
         scale: float = 1.0,
@@ -182,7 +180,6 @@ class ColorStripStore:
                 description=description,
                 clock_id=clock_id,
                 colors=colors if isinstance(colors, list) and len(colors) >= 2 else default_colors,
-                cycle_speed=float(cycle_speed) if cycle_speed else 1.0,
                 led_count=led_count,
             )
         elif source_type == "effect":
@@ -196,7 +193,6 @@ class ColorStripStore:
                 description=description,
                 clock_id=clock_id,
                 effect_type=effect_type or "fire",
-                speed=float(speed) if speed else 1.0,
                 led_count=led_count,
                 palette=palette or "fire",
                 color=rgb,
@@ -311,9 +307,7 @@ class ColorStripStore:
         frame_interpolation: Optional[bool] = None,
         animation: Optional[dict] = None,
         colors: Optional[list] = None,
-        cycle_speed: Optional[float] = None,
         effect_type: Optional[str] = None,
-        speed: Optional[float] = None,
         palette: Optional[str] = None,
         intensity: Optional[float] = None,
         scale: Optional[float] = None,
@@ -389,15 +383,11 @@ class ColorStripStore:
         elif isinstance(source, ColorCycleColorStripSource):
             if colors is not None and isinstance(colors, list) and len(colors) >= 2:
                 source.colors = colors
-            if cycle_speed is not None:
-                source.cycle_speed = float(cycle_speed)
             if led_count is not None:
                 source.led_count = led_count
         elif isinstance(source, EffectColorStripSource):
             if effect_type is not None:
                 source.effect_type = effect_type
-            if speed is not None:
-                source.speed = float(speed)
             if led_count is not None:
                 source.led_count = led_count
             if palette is not None: