Add WebUI navigation improvements: keyboard shortcuts, hash routing, command palette, cross-entity links

- Keyboard shortcuts: Ctrl+1-4 for tab switching
- URL hash routing: #tab/subtab format with browser back/forward support
- Tab count badges: running targets and active profiles counts
- Cross-entity quick links: clickable references navigate to related cards
- Command palette (Ctrl+K): global search across all entities with keyboard navigation
- Expand/collapse all sections: buttons in sub-tab bars
- Sticky section headers: headers pin while scrolling long card grids
- Improved section filter: better styling with reset button

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

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

@@ -577,6 +577,33 @@
     color: #fff;
 }
 
+.cs-expand-collapse-group {
+    margin-left: auto;
+    display: flex;
+    gap: 2px;
+}
+
+.btn-expand-collapse {
+    background: none;
+    border: 1px solid var(--border-color);
+    color: var(--text-secondary);
+    font-size: 0.85rem;
+    width: 28px;
+    height: 28px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    cursor: pointer;
+    border-radius: 4px;
+    transition: color 0.2s, background 0.2s;
+    padding: 0;
+}
+
+.btn-expand-collapse:hover {
+    color: var(--text-color);
+    background: var(--border-color);
+}
+
 .stream-tab-panel {
     display: none;
 }
@@ -603,6 +630,11 @@
     border-bottom: 1px solid var(--border-color);
 }
 
+.subtab-section-header.cs-header {
+    margin-bottom: 0;
+    padding-bottom: 8px;
+}
+
 /* ── Collapsible card sections (cs-*) ── */
 
 .cs-header {
@@ -611,6 +643,11 @@
     gap: 8px;
     cursor: pointer;
     user-select: none;
+    position: sticky;
+    top: 0;
+    z-index: 10;
+    background: var(--bg-color);
+    padding: 8px 0;
 }
 
 .cs-chevron {
@@ -635,22 +672,31 @@
     flex-shrink: 0;
 }
 
-.cs-filter {
+.cs-filter-wrap {
+    position: relative;
     margin-left: auto;
-    width: 160px;
+    width: 180px;
     max-width: 40%;
-    padding: 3px 8px !important;
+    flex-shrink: 0;
+}
+
+.cs-filter {
+    width: 100%;
+    padding: 4px 26px 4px 10px !important;
     font-size: 0.78rem !important;
     border: 1px solid var(--border-color) !important;
-    border-radius: 12px !important;
-    background: var(--bg-color) !important;
+    border-radius: 14px !important;
+    background: var(--bg-secondary) !important;
     color: var(--text-color) !important;
     outline: none;
     box-shadow: none !important;
+    box-sizing: border-box;
+    transition: border-color 0.2s, background 0.2s, width 0.2s;
 }
 
 .cs-filter:focus {
     border-color: var(--primary-color) !important;
+    background: var(--bg-color) !important;
 }
 
 .cs-filter::placeholder {
@@ -658,6 +704,28 @@
     font-size: 0.75rem;
 }
 
+.cs-filter-reset {
+    position: absolute;
+    right: 2px;
+    top: 50%;
+    transform: translateY(-50%);
+    background: none;
+    border: none;
+    color: var(--text-secondary);
+    font-size: 1rem;
+    cursor: pointer;
+    padding: 0 5px;
+    line-height: 1;
+    border-radius: 50%;
+    transition: color 0.15s, background 0.15s;
+    display: none;
+}
+
+.cs-filter-reset:hover {
+    color: var(--text-color);
+    background: var(--border-color);
+}
+
 /* Responsive adjustments */
 @media (max-width: 768px) {
     .templates-grid {