fix: export focusPathInSidebar from sidebar.js and import in viewer.js

Breadcrumb path clicks called focusPathInSidebar() which was defined
in sidebar.js but never exported or imported by viewer.js

frontend/js/sidebar.js

@@ -1120,4 +1120,4 @@ function searchByTag(tag) {
 }
 
 
-export { initVaultContext, setSelectedVaultContext, syncVaultSelectors, shouldDisplayPath, loadVaults, loadVaultSettings, initSidebarFilter, TagFilterService, loadTags, scrollTreeItemIntoView, refreshSidebarForContext, focusVaultInSidebar, refreshTagsForContext, syncActiveFileTreeItem, searchByTag, addTagFilter, buildSearchResultsHeader, removeTagFilter };
+export { initVaultContext, setSelectedVaultContext, syncVaultSelectors, shouldDisplayPath, loadVaults, loadVaultSettings, initSidebarFilter, TagFilterService, loadTags, scrollTreeItemIntoView, refreshSidebarForContext, focusVaultInSidebar, focusPathInSidebar, refreshTagsForContext, syncActiveFileTreeItem, searchByTag, addTagFilter, buildSearchResultsHeader, removeTagFilter };

frontend/js/viewer.js

@@ -3,7 +3,7 @@ import { api } from './auth.js';
 import { state } from './state.js';
 import { escapeHtml, safeCreateIcons, safeHighlight, getFileIcon, openEditor } from './utils.js';
 import { TabManager, closeMobileSidebar, ContextMenuManager, RightSidebarManager, showToast, buildFrontmatterCard } from './ui.js';
-import { syncActiveFileTreeItem, searchByTag, TagFilterService, refreshSidebarTreePreservingState } from './sidebar.js';
+import { syncActiveFileTreeItem, searchByTag, TagFilterService, refreshSidebarTreePreservingState, focusPathInSidebar } from './sidebar.js';
 import { AutocompleteDropdown, performAdvancedSearch } from './search.js';
 import { initDashboardTabs } from './sync.js';
 import { DashboardStatsWidget, DashboardRecentWidget, DashboardBookmarkWidget, DashboardSharedWidget, DashboardConflictsWidget } from './dashboard.js';