Merge branch 'perf/lag': dashboard lag fixes

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

# Conflicts:
#	client/src/components/Sagi/PetSprite.tsx
#	client/src/components/Sagi/useSagiBrain.ts

client/src/components/run/TerminalView.tsx

@@ -42,6 +42,7 @@
  * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
  */
 import {
+  memo,
   useEffect,
   useId,
   useMemo,
@@ -61,7 +62,7 @@ import { useTheme } from "../../hooks/useTheme";
 import { terminalThemeFor } from "../../lib/terminalTheme";
 import { api } from "../../lib/api";
 import { writeClipboard } from "../../lib/clipboard";
-import { notePaneFocus, registerPane } from "../../lib/panePaste";
+import { MENU_CURSOR_ROW, notePaneFocus, registerPane } from "../../lib/panePaste";
 import { attachImeInput } from "../../lib/imeInput";
 import { TERMINAL_FONTS, readTerminalFont } from "../../lib/terminalFont";
 import { FONT_SIZE_EVENT, readTerminalFontSize } from "../../lib/fontSize";
@@ -154,9 +155,22 @@ interface TerminalViewProps {
   /** Take the keyboard when it appears (default). Off for a split pane that
    *  is not the focused one, or keys would land in whichever mounted last. */
   autoFocus?: boolean;
+  /** Another layer (the pane's chat) covers it. xterm stops drawing only when
+   *  its IntersectionObserver says off screen, and a covered terminal is not —
+   *  so it is moved out of the viewport with a transform, which keeps its
+   *  layout size (no PTY resize; the chat still reads and answers its menus). */
+  covered?: boolean;
 }
 
-export function TerminalView({ runId, wsBaseUrl, onExit, autoFocus = true }: TerminalViewProps) {
+/** Memoized: the Workspace re-renders its pane tree on every lane_update, and
+ *  a terminal only cares about its own props (its owner keeps `onExit` stable). */
+export const TerminalView = memo(function TerminalView({
+  runId,
+  wsBaseUrl,
+  onExit,
+  autoFocus = true,
+  covered = false,
+}: TerminalViewProps) {
   const containerRef = useRef<HTMLDivElement>(null);
   // Read through a ref: an inline `onExit` from the parent changes identity on
   // every render, and as an effect dep it would tear the terminal down and
@@ -648,16 +662,27 @@ export function TerminalView({ runId, wsBaseUrl, onExit, autoFocus = true }: Ter
           if (wsRef.current?.readyState === WebSocket.OPEN) wsRef.current.send(data);
         },
         // The rows on screen, dim cells (a TUI's placeholder) left out.
-        () => {
+        // `menuOnly` (the chat's 700 ms menu poll): plain text first, and the
+        // cell-by-cell read only when a row could be a menu's cursor row.
+        (menuOnly = false) => {
           const term = termRef.current;
           if (!term) return null;
           const buf = term.buffer.active;
+          if (menuOnly) {
+            let maybe = false;
+            for (let y = 0; y < term.rows && !maybe; y++)
+              maybe = MENU_CURSOR_ROW.test(
+                buf.getLine(buf.baseY + y)?.translateToString(true) ?? ""
+              );
+            if (!maybe) return null;
+          }
           const rows: string[] = [];
+          const reuse = buf.getNullCell();
           for (let y = 0; y < term.rows; y++) {
             const line = buf.getLine(buf.baseY + y);
             let row = "";
             for (let x = 0; line && x < line.length; x++) {
-              const cell = line.getCell(x);
+              const cell = line.getCell(x, reuse);
               // Width 0: the right half of a wide character.
               if (cell && cell.getWidth() && !cell.isDim()) row += cell.getChars() || " ";
             }
@@ -722,7 +747,12 @@ export function TerminalView({ runId, wsBaseUrl, onExit, autoFocus = true }: Ter
       onPasteCapture={onPaste}
       onFocus={() => notePaneFocus(runId)}
     >
-      <div ref={containerRef} className="h-full w-full" data-testid="terminal-view" />
+      <div
+        ref={containerRef}
+        className="h-full w-full"
+        style={covered ? { transform: "translateX(-300vw)" } : undefined}
+        data-testid="terminal-view"
+      />
       <p id={hintId} className="sr-only">
         {t("terminal.keyboardHint")}
       </p>
@@ -823,4 +853,4 @@ export function TerminalView({ runId, wsBaseUrl, onExit, autoFocus = true }: Ter
       )}
     </div>
   );
-}
+});