Rename WLED Grab to LED Grab, merge Devices into Targets tab with WLED sub-tab, and UI polish

- Rename "WLED Grab" to "LED Grab" across all files (title, logs, locales)
- Merge Devices and Targets into a single Targets tab with WLED sub-tab
  containing Devices and Targets sections (like Sources tab pattern)
- Make target card source name label full-width
- Render engine template config as two-column key-value grid
- Update CLAUDE.md: no server restart needed for frontend-only changes

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

server/src/wled_controller/main.py

@@ -107,7 +107,7 @@ async def lifespan(app: FastAPI):
     Handles startup and shutdown events.
     """
     # Startup
-    logger.info(f"Starting WLED Grab v{__version__}")
+    logger.info(f"Starting LED Grab v{__version__}")
     logger.info(f"Python version: {sys.version}")
     logger.info(f"Server listening on {config.server.host}:{config.server.port}")
 
@@ -181,7 +181,7 @@ async def lifespan(app: FastAPI):
     yield
 
     # Shutdown
-    logger.info("Shutting down WLED Grab")
+    logger.info("Shutting down LED Grab")
 
     # Stop all processing
     try:
@@ -192,7 +192,7 @@ async def lifespan(app: FastAPI):
 
 # Create FastAPI application
 app = FastAPI(
-    title="WLED Grab",
+    title="LED Grab",
     description="Control WLED devices based on screen content for ambient lighting",
     version=__version__,
     lifespan=lifespan,
@@ -246,7 +246,7 @@ async def root():
 
     # Fallback to JSON if static files not found
     return {
-        "name": "WLED Grab",
+        "name": "LED Grab",
         "version": __version__,
         "docs": "/docs",
         "health": "/health",