Improve local filetree view state and sidebar performance

rust/crates/mnote-web/src/ssr/styles.rs

@@ -1522,6 +1522,18 @@ body {
   color: var(--atelier-text);
 }
 
+.wolai-section-add + .wolai-section-add {
+  margin-left: 2px;
+}
+
+.wolai-section-add .material-symbols-outlined {
+  width: 15px;
+  height: 15px;
+  font-size: 15px;
+  display: block;
+  color: currentColor;
+}
+
 .wolai-page-row {
   min-height: 30px;
   gap: 7px;
@@ -1560,6 +1572,39 @@ body {
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
+  flex: 1;
+  min-width: 0;
+}
+
+.wolai-row-more {
+  width: 26px;
+  height: 26px;
+  flex: 0 0 26px;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  border: 0;
+  border-radius: 4px;
+  background: transparent;
+  color: #8C8983;
+  opacity: 0;
+  cursor: pointer;
+}
+
+.wolai-page-row:hover .wolai-row-more,
+.wolai-row-more:focus-visible,
+.wolai-row-more[aria-expanded="true"] {
+  opacity: 1;
+}
+
+.wolai-row-more:hover {
+  background: #E7E4E0;
+  color: #4B4945;
+}
+
+.wolai-row-more .material-symbols-outlined {
+  font-size: 18px;
+  line-height: 1;
 }
 
 .sidebar-tree-section {