feat: implement full breadcrumb path navigation in Files tab

- Add breadcrumbPath array to app state for tracking folder hierarchy
- Rewrite updateBreadcrumb() to render full path: Home > folder > subfolder
- Each breadcrumb segment is clickable to navigate back to that level
- Current folder shown in bold (non-clickable), parent folders as links
- Reset breadcrumb path on tab switch, home navigation, and initial load
- Update navigateFolder/selectFolder to push to breadcrumb path
- Enhanced breadcrumb CSS with hover effects and dark mode support

static/js/app/main.js

@@ -52,6 +52,14 @@ const ACTIONS_BAR_TEMPLATES = {
                 <span data-i18n="trash.empty_trash">Empty trash</span>
             </button>
         </div>
+        <div class="view-toggle">
+            <button class="toggle-btn active" id="grid-view-btn" title="Grid view">
+                <i class="fas fa-th"></i>
+            </button>
+            <button class="toggle-btn" id="list-view-btn" title="List view">
+                <i class="fas fa-list"></i>
+            </button>
+        </div>
     `,
     favorites: `
         <div class="action-buttons"></div>
@@ -537,8 +545,9 @@ window.setActionsBarMode = setActionsBarMode;
 
 // Set up global selectFolder function for navigation
 window.selectFolder = (id, name) => {
+    app.breadcrumbPath.push({ id, name });
     app.currentPath = id;
-    ui.updateBreadcrumb(name);
+    ui.updateBreadcrumb();
     window.loadFiles();
 };