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/layout.css

@@ -144,6 +144,25 @@ h2 {
     border-bottom-color: var(--primary-color);
 }
 
+.tab-badge {
+    background: var(--border-color);
+    color: var(--text-secondary);
+    font-size: 0.65rem;
+    font-weight: 700;
+    padding: 1px 5px;
+    border-radius: 8px;
+    margin-left: 4px;
+    min-width: 16px;
+    text-align: center;
+    line-height: 1.3;
+    display: inline-block;
+}
+
+.tab-btn.active .tab-badge {
+    background: var(--primary-color);
+    color: #fff;
+}
+
 .tab-panel {
     display: none;
 }
@@ -200,6 +219,129 @@ h2 {
     text-decoration: underline;
 }
 
+/* Command Palette */
+#command-palette {
+    position: fixed;
+    inset: 0;
+    z-index: 3000;
+    display: flex;
+    justify-content: center;
+    padding-top: 15vh;
+}
+
+.cp-backdrop {
+    position: absolute;
+    inset: 0;
+    background: rgba(0, 0, 0, 0.5);
+    backdrop-filter: blur(2px);
+}
+
+.cp-dialog {
+    position: relative;
+    width: 520px;
+    max-width: 90vw;
+    max-height: 60vh;
+    background: var(--card-bg);
+    border: 1px solid var(--border-color);
+    border-radius: 12px;
+    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.3);
+    display: flex;
+    flex-direction: column;
+    overflow: hidden;
+    align-self: flex-start;
+}
+
+.cp-input {
+    width: 100%;
+    padding: 14px 16px;
+    border: none;
+    border-bottom: 1px solid var(--border-color);
+    background: transparent;
+    color: var(--text-color);
+    font-size: 1rem;
+    outline: none;
+    box-sizing: border-box;
+}
+
+.cp-input::placeholder {
+    color: var(--text-secondary);
+}
+
+.cp-results {
+    flex: 1;
+    overflow-y: auto;
+    padding: 4px 0;
+}
+
+.cp-group-header {
+    font-size: 0.7rem;
+    font-weight: 700;
+    text-transform: uppercase;
+    letter-spacing: 0.05em;
+    color: var(--text-secondary);
+    padding: 8px 16px 4px;
+}
+
+.cp-result {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+    padding: 8px 16px;
+    cursor: pointer;
+    transition: background 0.1s;
+}
+
+.cp-result:hover {
+    background: var(--bg-secondary);
+}
+
+.cp-result.cp-active {
+    background: var(--primary-color);
+    color: #fff;
+}
+
+.cp-result.cp-active .cp-detail {
+    color: rgba(255, 255, 255, 0.7);
+}
+
+.cp-icon {
+    flex-shrink: 0;
+    width: 20px;
+    text-align: center;
+    font-size: 0.9rem;
+}
+
+.cp-name {
+    flex: 1;
+    min-width: 0;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+    font-size: 0.9rem;
+}
+
+.cp-detail {
+    flex-shrink: 0;
+    font-size: 0.75rem;
+    color: var(--text-secondary);
+}
+
+.cp-loading,
+.cp-empty {
+    padding: 24px 16px;
+    text-align: center;
+    color: var(--text-secondary);
+    font-size: 0.9rem;
+}
+
+.cp-footer {
+    padding: 6px 16px;
+    border-top: 1px solid var(--border-color);
+    font-size: 0.7rem;
+    color: var(--text-secondary);
+    text-align: center;
+}
+
 @media (max-width: 768px) {
     header {
         flex-direction: column;