CSS: add StaticColorStripSource type with auto-sized LED count

Introduces a new 'static' source type that fills all device LEDs with a
single constant RGB color — no screen capture or processing required.

- StaticColorStripSource storage model (color + led_count=0 auto-size)
- StaticColorStripStream: no background thread, configure() sizes to device
  LED count at processor start; hot-updates preserve runtime size
- ColorStripStreamManager dispatches static sources (no LiveStream needed)
- WledTargetProcessor calls stream.configure(device_led_count) on start
- API schemas/routes: source_type Literal["picture","static"]; color field;
  overlay/calibration-test endpoints return 400 for static
- Frontend: type selector modal, color picker, type-aware card rendering
  (🎨 icon + color swatch), LED count field hidden for static type
- Locale keys: color_strip.type, color_strip.static_color (en + ru)

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

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

@@ -12,7 +12,8 @@ class ColorStripSourceCreate(BaseModel):
     """Request to create a color strip source."""
 
     name: str = Field(description="Source name", min_length=1, max_length=100)
-    source_type: Literal["picture"] = Field(default="picture", description="Source type")
+    source_type: Literal["picture", "static"] = Field(default="picture", description="Source type")
+    # picture-type fields
     picture_source_id: str = Field(default="", description="Picture source ID (for picture type)")
     fps: int = Field(default=30, description="Target frames per second", ge=10, le=90)
     brightness: float = Field(default=1.0, description="Brightness multiplier (0.0-2.0)", ge=0.0, le=2.0)
@@ -20,8 +21,11 @@ class ColorStripSourceCreate(BaseModel):
     gamma: float = Field(default=1.0, description="Gamma correction (1.0=none, <1=brighter, >1=darker mids)", ge=0.1, le=3.0)
     smoothing: float = Field(default=0.3, description="Temporal smoothing (0.0=none, 1.0=full)", ge=0.0, le=1.0)
     interpolation_mode: str = Field(default="average", description="LED color interpolation mode (average, median, dominant)")
-    led_count: int = Field(default=0, description="Total LED count (0 = auto from calibration)", ge=0)
     calibration: Optional[Calibration] = Field(None, description="LED calibration (position and count per edge)")
+    # static-type fields
+    color: Optional[List[int]] = Field(None, description="Static RGB color [R, G, B] (0-255 each, for static type)")
+    # shared
+    led_count: int = Field(default=0, description="Total LED count (0 = auto from calibration / device)", ge=0)
     description: Optional[str] = Field(None, description="Optional description", max_length=500)
 
 
@@ -29,6 +33,7 @@ class ColorStripSourceUpdate(BaseModel):
     """Request to update a color strip source."""
 
     name: Optional[str] = Field(None, description="Source name", min_length=1, max_length=100)
+    # picture-type fields
     picture_source_id: Optional[str] = Field(None, description="Picture source ID")
     fps: Optional[int] = Field(None, description="Target FPS", ge=10, le=90)
     brightness: Optional[float] = Field(None, description="Brightness multiplier (0.0-2.0)", ge=0.0, le=2.0)
@@ -36,8 +41,11 @@ class ColorStripSourceUpdate(BaseModel):
     gamma: Optional[float] = Field(None, description="Gamma correction (0.1-3.0)", ge=0.1, le=3.0)
     smoothing: Optional[float] = Field(None, description="Temporal smoothing (0.0-1.0)", ge=0.0, le=1.0)
     interpolation_mode: Optional[str] = Field(None, description="Interpolation mode (average, median, dominant)")
-    led_count: Optional[int] = Field(None, description="Total LED count (0 = auto from calibration)", ge=0)
     calibration: Optional[Calibration] = Field(None, description="LED calibration")
+    # static-type fields
+    color: Optional[List[int]] = Field(None, description="Static RGB color [R, G, B] (0-255 each, for static type)")
+    # shared
+    led_count: Optional[int] = Field(None, description="Total LED count (0 = auto from calibration / device)", ge=0)
     description: Optional[str] = Field(None, description="Optional description", max_length=500)
 
 
@@ -47,6 +55,7 @@ class ColorStripSourceResponse(BaseModel):
     id: str = Field(description="Source ID")
     name: str = Field(description="Source name")
     source_type: str = Field(description="Source type")
+    # picture-type fields
     picture_source_id: Optional[str] = Field(None, description="Picture source ID")
     fps: Optional[int] = Field(None, description="Target FPS")
     brightness: Optional[float] = Field(None, description="Brightness multiplier")
@@ -54,8 +63,11 @@ class ColorStripSourceResponse(BaseModel):
     gamma: Optional[float] = Field(None, description="Gamma correction")
     smoothing: Optional[float] = Field(None, description="Temporal smoothing")
     interpolation_mode: Optional[str] = Field(None, description="Interpolation mode")
-    led_count: int = Field(0, description="Total LED count (0 = auto from calibration)")
     calibration: Optional[Calibration] = Field(None, description="LED calibration")
+    # static-type fields
+    color: Optional[List[int]] = Field(None, description="Static RGB color [R, G, B]")
+    # shared
+    led_count: int = Field(0, description="Total LED count (0 = auto from calibration / device)")
     description: Optional[str] = Field(None, description="Description")
     overlay_active: bool = Field(False, description="Whether the screen overlay is currently active")
     created_at: datetime = Field(description="Creation timestamp")