feat(app): stopped panel paints last screen + Resume/Restart fresh controls

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/src/LayoutEngine.tsx

@@ -1,11 +1,12 @@
 import { useEffect, useRef, useState } from "react";
-import { Maximize2, Minimize2, RotateCw, GripVertical } from "lucide-react";
+import { Maximize2, Minimize2, RotateCw, GripVertical, Play } from "lucide-react";
+import { Terminal } from "@xterm/xterm";
 import { TerminalView } from "./TerminalView";
 import { SearchBar } from "./SearchBar";
 import { StatusRing } from "./StatusRing";
 import { COLORS, FONT, STATE_COLOR } from "./theme";
 import type { LayoutNode, SurfaceState, SurfaceView } from "./layoutTypes";
-import { setRatios, restartSurface, setZoom, moveSurface } from "./socketBridge";
+import { setRatios, restartSurface, setZoom, moveSurface, attachSurface } from "./socketBridge";
 
 interface Props {
   workspaceId: string;
@@ -116,6 +117,43 @@ function Node({ node, path, ...rest }: NodeProps) {
   return <SplitView split={node.split} path={path} {...rest} />;
 }
 
+const NERD_FALLBACK_LE = "'Symbols Nerd Font Mono'";
+const fontStackLE = (family: string | null) =>
+  family ? `'${family}', ${NERD_FALLBACK_LE}, monospace`
+         : `'JetBrains Mono Variable', 'JetBrains Mono', ${NERD_FALLBACK_LE}, monospace`;
+
+function xtermThemeLE(p: Record<string, string>) {
+  return {
+    background: p["bg-panel"],
+    foreground: p["text-primary"],
+    cursor: p["text-primary"],
+    selectionBackground: p["search-match"],
+  };
+}
+
+function StoppedSnapshot({ surfaceId, font, palette }: { surfaceId: string; font: { family: string; size: number } | null; palette: Record<string, string> | null }) {
+  const hostRef = useRef<HTMLDivElement | null>(null);
+  useEffect(() => {
+    const host = hostRef.current;
+    if (!host) return;
+    const term = new Terminal({
+      fontFamily: fontStackLE(font?.family ?? null),
+      fontSize: font?.size ?? 13,
+      theme: palette ? xtermThemeLE(palette) : undefined,
+      cursorBlink: false,
+      disableStdin: true,
+      scrollback: 0,
+    });
+    term.open(host);
+    let disposed = false;
+    void attachSurface(surfaceId, () => {}).then((res) => {
+      if (!disposed && res.snapshot) term.write(res.snapshot);
+    });
+    return () => { disposed = true; term.dispose(); };
+  }, [surfaceId, font, palette]); // eslint-disable-line react-hooks/exhaustive-deps
+  return <div ref={hostRef} style={{ position: "absolute", inset: 0, opacity: 0.45, pointerEvents: "none" }} />;
+}
+
 function Leaf({ id, workspaceId, running, states, surfaces, focusedId, onFocus, zoomed, drop, onStartPanelDrag, searchSurfaceId, searchNonce, onCloseSearch, font, palette }: Omit<NodeProps, "node" | "path"> & { id: string }) {
   const focused = focusedId === id;
   const dropEdge = drop && drop.id === id ? drop.edge : null;
@@ -142,12 +180,18 @@ function Leaf({ id, workspaceId, running, states, surfaces, focusedId, onFocus,
 
   if (running[id] === false) {
     return card(
-      <div style={{ display: "flex", alignItems: "center", justifyContent: "center", height: "100%", width: "100%", color: COLORS.textSecondary, flexDirection: "column", gap: 10 }}>
+      <div style={{ position: "relative", height: "100%", width: "100%" }}>
-        <div style={{ fontFamily: FONT.mono, fontSize: 13 }}>Process exited</div>
+        <StoppedSnapshot surfaceId={id} font={font} palette={palette} />
+        <div style={{ position: "absolute", inset: 0, display: "flex", alignItems: "center", justifyContent: "center", flexDirection: "column", gap: 10, color: COLORS.textSecondary, background: "rgba(0,0,0,0.35)" }}>
+          <div style={{ fontFamily: FONT.mono, fontSize: 13 }}>Stopped</div>
           <div style={{ display: "flex", gap: 8 }}>
-          <button onClick={() => void restartSurface(id)}
+            <button onClick={() => void restartSurface(id, true)}
+              style={{ display: "flex", alignItems: "center", gap: 6, padding: "6px 14px", background: COLORS.accent, color: COLORS.bgApp, border: "none", borderRadius: 7, fontSize: 12, fontWeight: 600 }}>
+              <Play size={13} /> Resume
+            </button>
+            <button onClick={() => void restartSurface(id, false)}
               style={{ display: "flex", alignItems: "center", gap: 6, padding: "6px 14px", background: COLORS.bgElevated, color: COLORS.textPrimary, border: `1px solid ${COLORS.borderStrong}`, borderRadius: 7, fontSize: 12 }}>
-            <RotateCw size={13} /> Restart
+              <RotateCw size={13} /> Restart fresh
             </button>
             {zoomed === id && (
               <button onClick={() => void setZoom(workspaceId, null)}
@@ -157,6 +201,7 @@ function Leaf({ id, workspaceId, running, states, surfaces, focusedId, onFocus,
             )}
           </div>
         </div>
+      </div>
     );
   }