Add Hide All / Show All button for indicators

- Add visibility-toggle button next to Clear All button
- Button toggles between 'Hide All' and 'Show All' text
- Hides/shows all indicators with single click
- Uses event delegation to handle button clicks in container

src/api/dashboard/static/js/ui/indicators-panel-new.js

@@ -119,6 +119,9 @@ export function renderIndicatorPanel() {
     
     const favoriteIds = new Set(userPresets.favorites || []);
     
+    const allVisible = activeIndicators.length > 0 ? activeIndicators.every(ind => ind.visible !== false) : false;
+    const visibilityBtnText = allVisible ? 'Hide All' : 'Show All';
+    
     container.innerHTML = `
         <div class="indicator-panel">
             <!-- Search Bar -->
@@ -162,6 +165,7 @@ export function renderIndicatorPanel() {
                 <div class="indicator-section active">
                     <div class="section-title">
                         ${activeIndicators.length} Active
+                        ${activeIndicators.length > 0 ? `<button class="visibility-toggle">${visibilityBtnText}</button>` : ''}
                         ${activeIndicators.length > 0 ? `<button class="clear-all">Clear All</button>` : ''}
                     </div>
                     ${activeIndicators.slice().reverse().map(ind => renderActiveIndicator(ind)).join('')}
@@ -392,6 +396,15 @@ function setupEventListeners() {
             return;
         }
         
+        // Visibility toggle (Hide All / Show All) button
+        const visibilityToggleBtn = e.target.closest('.visibility-toggle');
+        if (visibilityToggleBtn) {
+            if (window.toggleAllIndicatorsVisibility) {
+                window.toggleAllIndicatorsVisibility();
+            }
+            return;
+        }
+        
         // Expand/collapse button
         const expandBtn = e.target.closest('.indicator-btn.expand');
         if (expandBtn) {
@@ -481,6 +494,17 @@ window.clearAllIndicators = function() {
     drawIndicatorsOnChart();
 }
 
+window.toggleAllIndicatorsVisibility = function() {
+    const allVisible = activeIndicators.every(ind => ind.visible !== false);
+    
+    activeIndicators.forEach(ind => {
+        ind.visible = !allVisible;
+    });
+    
+    drawIndicatorsOnChart();
+    renderIndicatorPanel();
+}
+
 function removeIndicatorById(id) {
     const idx = activeIndicators.findIndex(a => a.id === id);
     if (idx < 0) return;