Add clickable breadcrumbs that focus and expand corresponding sidebar paths with vault panel auto-expansion and improved collapsed state styling

frontend/style.css

@@ -318,6 +318,18 @@ a:hover {
   flex: 1 1 auto;
   min-height: 0;
   max-height: none;
+  padding-top: 0;
+}
+
+.sidebar.vault-collapsed .sidebar-tree {
+  flex: 0 0 auto;
+  min-height: 0;
+  padding-bottom: 0;
+}
+
+.sidebar.vault-collapsed .tag-resize-handle {
+  border-top: none;
+  height: 0;
 }
 
 .sidebar.tag-collapsed .sidebar-tree {
@@ -577,6 +589,10 @@ a:hover {
   display: none;
 }
 
+.sidebar.vault-collapsed .tag-panel-toggle {
+  border-top: 1px solid var(--border);
+}
+
 /* --- Sidebar resize handle (horizontal) --- */
 .sidebar-resize-handle {
   width: 5px;