perf(grid): optimize virtual scroll to reduce white flash during fast scrolling

Add buffer, skip-hover, will-change, and CSS contain properties to all
RecycleScroller instances (DataGrid, ConnectionTree, ObjectBrowser,
RedisKeyBrowser). Disable pointer-events during scroll in DataGrid to
reduce repaint overhead.

src/components/grid/DataGrid.vue

@@ -755,6 +755,17 @@ function syncHeaderScroll(e: Event) {
   }
 }
 
+let scrollingTimer = 0;
+const isScrolling = ref(false);
+function onScrollerScroll(e: Event) {
+  syncHeaderScroll(e);
+  if (!isScrolling.value) isScrolling.value = true;
+  clearTimeout(scrollingTimer);
+  scrollingTimer = window.setTimeout(() => {
+    isScrolling.value = false;
+  }, 120);
+}
+
 initColumnWidths();
 watch(() => visibleColumns.value.length, initColumnWidths);
 watch(
@@ -2134,10 +2145,13 @@ defineExpose({
                 v-else
                 ref="scrollerRef"
                 class="data-grid-scroller flex-1 overflow-x-auto overscroll-none"
+                :class="{ 'is-scrolling': isScrolling }"
                 :items="displayItems"
                 :item-size="26"
+                :buffer="600"
+                :skip-hover="true"
                 key-field="id"
-                @scroll="syncHeaderScroll"
+                @scroll="onScrollerScroll"
               >
                 <template #default="{ item, index }">
                   <div
@@ -2600,6 +2614,8 @@ defineExpose({
 <style scoped>
 .data-grid-scroller {
   overflow-anchor: none;
+  will-change: scroll-position;
+  contain: strict;
 }
 
 .data-grid-scroller :deep(.vue-recycle-scroller__item-wrapper) {
@@ -2607,6 +2623,14 @@ defineExpose({
   overflow: visible;
 }
 
+.data-grid-scroller :deep(.vue-recycle-scroller__item-view) {
+  contain: layout style paint;
+}
+
+.data-grid-scroller.is-scrolling :deep(.vue-recycle-scroller__item-view) {
+  pointer-events: none;
+}
+
 .ddl-drawer-resizing {
   transition: none;
 }

src/components/objects/ObjectBrowser.vue

@@ -408,7 +408,14 @@ watch(
         <div class="truncate">{{ t("objects.schemaColumn") }}</div>
         <div v-if="hasComments" class="truncate">{{ t("objects.comment") }}</div>
       </div>
-      <RecycleScroller class="min-h-0 flex-1" :items="filteredRows" :item-size="38" key-field="id">
+      <RecycleScroller
+        class="object-browser-scroller min-h-0 flex-1"
+        :items="filteredRows"
+        :item-size="38"
+        :buffer="600"
+        :skip-hover="true"
+        key-field="id"
+      >
         <template #default="{ item }">
           <div
             class="grid h-[38px] cursor-pointer items-center gap-3 border-b px-3 hover:bg-accent/50"
@@ -514,3 +521,14 @@ watch(
     </div>
   </div>
 </template>
+
+<style scoped>
+.object-browser-scroller {
+  will-change: scroll-position;
+  contain: content;
+}
+
+.object-browser-scroller :deep(.vue-recycle-scroller__item-view) {
+  contain: layout style paint;
+}
+</style>

src/components/redis/RedisKeyBrowser.vue

@@ -398,7 +398,15 @@ onMounted(loadKeys);
           <Loader2 class="w-3.5 h-3.5 animate-spin" />
           <span>{{ t("redis.loadingKeys") }}</span>
         </div>
-        <RecycleScroller v-else class="flex-1" :items="visibleRows" :item-size="28" key-field="id">
+        <RecycleScroller
+          v-else
+          class="redis-key-scroller flex-1"
+          :items="visibleRows"
+          :item-size="28"
+          :buffer="600"
+          :skip-hover="true"
+          key-field="id"
+        >
           <template #default="{ item: row }">
             <div
               class="grid border-b text-xs cursor-pointer hover:bg-accent/50 group"
@@ -500,3 +508,14 @@ onMounted(loadKeys);
     @confirm="applyDangerAction"
   />
 </template>
+
+<style scoped>
+.redis-key-scroller {
+  will-change: scroll-position;
+  contain: content;
+}
+
+.redis-key-scroller :deep(.vue-recycle-scroller__item-view) {
+  contain: layout style paint;
+}
+</style>

src/components/sidebar/ConnectionTree.vue

@@ -247,11 +247,12 @@ function onSearchToggle(node: TreeNode) {
     </div>
     <RecycleScroller
       v-if="flatNodes.length > 0 && useVirtualTree"
-      class="min-h-0 flex-1 overflow-y-auto"
+      class="connection-tree-scroller min-h-0 flex-1 overflow-y-auto"
       :items="flatNodes"
       :item-size="SIDEBAR_TREE_ROW_HEIGHT"
       :buffer="SIDEBAR_TREE_SCROLL_BUFFER"
       :prerender="SIDEBAR_TREE_PRERENDER_COUNT"
+      :skip-hover="true"
       key-field="id"
       type-field="type"
       flow-mode
@@ -284,3 +285,14 @@ function onSearchToggle(node: TreeNode) {
     </div>
   </div>
 </template>
+
+<style scoped>
+.connection-tree-scroller {
+  will-change: scroll-position;
+  contain: content;
+}
+
+.connection-tree-scroller :deep(.vue-recycle-scroller__item-view) {
+  contain: layout style paint;
+}
+</style>

src/composables/useFlatTree.ts

@@ -1,7 +1,7 @@
 import type { TreeNode, TreeNodeType } from "@/types/database";
 
 export const SIDEBAR_TREE_ROW_HEIGHT = 28;
-export const SIDEBAR_TREE_SCROLL_BUFFER = SIDEBAR_TREE_ROW_HEIGHT * 48;
+export const SIDEBAR_TREE_SCROLL_BUFFER = 600;
 export const SIDEBAR_TREE_PRERENDER_COUNT = 48;
 
 export interface FlatTreeNode {