Separate tree nodes into independent panels, remove graph local search, UI improvements

- Split Sources tab: raw/raw_templates, processed/proc_templates each get own panel
- Split Targets tab: led-devices, led-targets, kc-targets, kc-patterns each get own panel
- Remove graph local search — search button and / key open global command palette
- Add graphNavigateToNode for command palette → graph node navigation
- Add tree group expand/collapse animation (max-height + opacity transition)
- Make tree group headers visually distinct (smaller, uppercase, left border on children)
- Make CardSection collapse opt-in via collapsible flag (disabled by default)
- Move filter textbox next to section title (remove margin-left: auto)
- Fix notification bell button vertical centering in test preview
- Fix clipboard copy on non-HTTPS with execCommand fallback
- Add overlay toggle button on picture-based CSS cards
- Add CSPT to graph add-entity picker and global search
- Update all cross-link navigation paths for new panel keys
- Add i18n keys for new tree groups and search groups (en/ru/zh)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/src/wled_controller/static/css/streams.css

@@ -732,11 +732,15 @@ body.pp-filter-dragging .pp-filter-drag-handle {
     display: flex;
     align-items: center;
     gap: 8px;
-    cursor: pointer;
+    cursor: default;
     user-select: none;
     padding: 8px 0;
 }
 
+.cs-header:has(.cs-chevron) {
+    cursor: pointer;
+}
+
 /* Prevent sticky header from clipping cards that lift on hover */
 [data-cs-content] {
     padding-top: 4px;
@@ -783,7 +787,6 @@ body.pp-filter-dragging .pp-filter-drag-handle {
 
 .cs-filter-wrap {
     position: relative;
-    margin-left: auto;
     width: 180px;
     max-width: 40%;
     flex-shrink: 0;

server/src/wled_controller/static/css/tree-nav.css

@@ -30,6 +30,10 @@
     margin-bottom: 2px;
 }
 
+.tree-group:first-child > .tree-group-header {
+    margin-top: 0;
+}
+
 .tree-group-header {
     display: flex;
     align-items: center;
@@ -37,13 +41,14 @@
     padding: 6px 10px;
     cursor: pointer;
     user-select: none;
-    font-size: 0.78rem;
-    font-weight: 600;
-    color: var(--text-secondary);
+    font-size: 0.72rem;
+    font-weight: 700;
+    color: var(--text-muted);
     border-radius: 6px;
     transition: color 0.15s, background 0.15s;
     text-transform: uppercase;
-    letter-spacing: 0.03em;
+    letter-spacing: 0.05em;
+    margin-top: 6px;
 }
 
 .tree-group-header:hover {
@@ -98,21 +103,28 @@
 
 .tree-children {
     overflow: hidden;
+    margin-left: 14px;
+    border-left: 1px solid var(--border-color);
+    padding-left: 0;
+    max-height: 500px;
+    opacity: 1;
+    transition: max-height 0.25s ease, opacity 0.2s ease;
 }
 
 .tree-children.collapsed {
-    display: none;
+    max-height: 0;
+    opacity: 0;
 }
 
 .tree-leaf {
     display: flex;
     align-items: center;
     gap: 6px;
-    padding: 5px 10px 5px 26px;
+    padding: 5px 10px 5px 12px;
     cursor: pointer;
     font-size: 0.8rem;
     color: var(--text-secondary);
-    border-radius: 6px;
+    border-radius: 0 6px 6px 0;
     margin: 1px 0;
     transition: color 0.15s, background 0.15s;
 }
@@ -243,6 +255,12 @@
         display: flex;
         flex-wrap: wrap;
         gap: 2px;
+        margin-left: 0;
+        border-left: none;
+        padding-left: 0;
+        max-height: none;
+        opacity: 1;
+        transition: none;
     }
 
     .tree-children.collapsed {