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/static/style.css

@@ -1934,6 +1934,32 @@ input:-webkit-autofill:focus {
     font-family: monospace;
 }
 
+/* Engine config grid (property name left, input right) */
+.config-grid {
+    display: grid;
+    grid-template-columns: auto 1fr;
+    gap: 8px 12px;
+    align-items: center;
+}
+
+.config-grid-label {
+    font-size: 0.85rem;
+    color: var(--text-secondary);
+    white-space: nowrap;
+    text-align: right;
+}
+
+.config-grid-value input,
+.config-grid-value select {
+    width: 100%;
+    padding: 6px 10px;
+    border: 1px solid var(--border-color);
+    border-radius: 4px;
+    background: var(--bg-color);
+    color: var(--text-color);
+    font-size: 0.85rem;
+}
+
 .template-card-actions {
     display: flex;
     gap: 8px;