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/css/components/shareDialog.css

@@ -0,0 +1,68 @@
+.permission-options {
+	display: flex;
+	gap: 15px;
+	margin-top: 5px;
+}
+
+.permission-option {
+	display: flex;
+	align-items: center;
+	gap: 5px;
+}
+
+.existing-share-item {
+	background-color: #f8f9fa;
+	border-radius: 4px;
+	padding: 10px;
+	margin-bottom: 10px;
+}
+
+.share-url {
+	font-size: 12px;
+	overflow: hidden;
+	text-overflow: ellipsis;
+	white-space: nowrap;
+	margin-bottom: 5px;
+	color: #1565c0;
+}
+
+.share-info {
+	font-size: 11px;
+	display: flex;
+	gap: 15px;
+	margin-bottom: 10px;
+	color: #757575;
+}
+
+.share-protected {
+	color: #1565c0;
+}
+
+.share-expiration {
+	color: #b71c1c;
+}
+
+.share-actions {
+	display: flex;
+	gap: 5px;
+	justify-content: flex-end;
+}
+
+.share-link-actions {
+	display: flex;
+	gap: 10px;
+	margin-top: 5px;
+}
+
+.btn-small {
+	font-size: 12px;
+	padding: 5px 10px;
+}
+
+#notification-message {
+	width: 100%;
+	padding: 10px;
+	border: 1px solid #ddd;
+	border-radius: 4px;
+	resize: vertical;
+}