feat(agent-manager): add expand/collapse all button to inline diff panel (#8562)

packages/kilo-vscode/webview-ui/agent-manager/DiffPanel.tsx

@@ -307,6 +307,11 @@ export const DiffPanel: Component<DiffPanelProps> = (props) => {
     sendAllToChat()
   }
 
+  const handleExpandAll = () => {
+    const allOpen = open().length === props.diffs.length
+    setOpen(allOpen ? [] : props.diffs.map((d) => d.file))
+  }
+
   const totals = createMemo(() => ({
     files: props.diffs.length,
     additions: props.diffs.reduce((sum, diff) => sum + diff.additions, 0),
@@ -354,6 +359,28 @@ export const DiffPanel: Component<DiffPanelProps> = (props) => {
           </Show>
         </div>
         <div class="am-diff-header-actions">
+          <Show when={props.diffs.length > 0}>
+            <Tooltip
+              value={
+                open().length === props.diffs.length
+                  ? t("ui.sessionReview.collapseAll")
+                  : t("ui.sessionReview.expandAll")
+              }
+              placement="bottom"
+            >
+              <IconButton
+                icon="chevron-grabber-vertical"
+                size="small"
+                variant="ghost"
+                label={
+                  open().length === props.diffs.length
+                    ? t("ui.sessionReview.collapseAll")
+                    : t("ui.sessionReview.expandAll")
+                }
+                onClick={handleExpandAll}
+              />
+            </Tooltip>
+          </Show>
           <Show when={props.onExpand}>
             <Tooltip value={t("command.review.toggle")} placement="bottom">
               <IconButton