fix(app): working scrollback search + stop prompt duplication on focus

Search fixes:
- TerminalView sets allowProposedApi (the search addon's match decorations
  use registerMarker/registerDecoration); without it findNext threw before
  firing results, so the counter was stuck at 0/0.
- The search bar now renders inside the panel it targets (in the header)
  instead of a global top-right overlay, so it's obvious which panel is
  searched.
- Search is anchored to the panel it was opened on (searchSurfaceId) and no
  longer follows focus — opening it in one panel and switching away no longer
  shows it open elsewhere.

Prompt duplication:
- The focus border was 1px when unfocused, 2px when focused; with border-box
  that resized the content on every focus switch, firing ResizeObserver -> fit
  -> PTY SIGWINCH and making zsh/powerlevel10k reprint its prompt. The border
  is now a constant 2px, color-only on focus.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/src/App.tsx

@@ -3,7 +3,6 @@ import { LayoutEngine } from "./LayoutEngine";
 import { Sidebar } from "./Sidebar";
 import { TopBar } from "./TopBar";
 import { CenterToolbar } from "./CenterToolbar";
-import { SearchBar } from "./SearchBar";
 import { Wizard } from "./Wizard";
 import { EventCenter } from "./EventCenter";
 import { maybeNotify } from "./notify";
@@ -35,9 +34,10 @@ export function App() {
   const [health, setHealth] = useState<DaemonHealth | null>(null);
   const [connected, setConnected] = useState(false);
   const [focusedId, setFocusedId] = useState<string | null>(null);
-  const [searchOpen, setSearchOpen] = useState(false);
+  const [searchSurfaceId, setSearchSurfaceId] = useState<string | null>(null);
   const [searchNonce, setSearchNonce] = useState(0);
   const activeRef = useRef<string | null>(null);
+  const effectiveFocusRef = useRef<string | null>(null);
   const wsRef = useRef<WorkspaceView[]>([]);
   activeRef.current = activeId;
   wsRef.current = workspaces;
@@ -107,7 +107,11 @@ export function App() {
   useEffect(() => {
     const onKey = (e: KeyboardEvent) => {
       if ((e.metaKey || e.ctrlKey) && e.key.toLowerCase() === "f") {
-        if (activeRef.current) { e.preventDefault(); setSearchOpen(true); setSearchNonce((n) => n + 1); }
+        if (activeRef.current && effectiveFocusRef.current) {
+          e.preventDefault();
+          setSearchSurfaceId(effectiveFocusRef.current); // anchor to the focused panel
+          setSearchNonce((n) => n + 1);
+        }
       }
     };
     window.addEventListener("keydown", onKey);
@@ -121,6 +125,7 @@ export function App() {
   const active = workspaces.find((w) => w.id === activeId) ?? null;
   const leaves = active ? leafIds(active.layout) : [];
   const effectiveFocus = focusedId && leaves.includes(focusedId) ? focusedId : leaves[0] ?? null;
+  effectiveFocusRef.current = effectiveFocus;
 
   function selectWorkspace(id: string) {
     setActiveId(id);
@@ -135,13 +140,12 @@ export function App() {
         {sidebarOpen && <Sidebar groups={groups} workspaces={workspaces} activeId={activeId} onSelect={selectWorkspace} onNew={() => setWizard(true)} health={health} connected={connected} />}
         <div style={{ flex: 1, display: "flex", flexDirection: "column", minWidth: 0 }}>
           {active && (
-            <CenterToolbar selected="" onSelect={(p) => { if (active) void applyPreset(active.id, p, []); }} onOpenSearch={() => setSearchOpen(true)} />
+            <CenterToolbar selected="" onSelect={(p) => { if (active) void applyPreset(active.id, p, []); }} onOpenSearch={() => { if (effectiveFocus) { setSearchSurfaceId(effectiveFocus); setSearchNonce((n) => n + 1); } }} />
           )}
           <div style={{ flex: 1, minHeight: 0, position: "relative" }}>
             {active
-              ? <LayoutEngine workspaceId={active.id} layout={active.layout} running={running} states={states} surfaces={active.surfaces} focusedId={effectiveFocus} onFocus={setFocusedId} zoomed={active.zoomed} />
+              ? <LayoutEngine workspaceId={active.id} layout={active.layout} running={running} states={states} surfaces={active.surfaces} focusedId={effectiveFocus} onFocus={setFocusedId} zoomed={active.zoomed} searchSurfaceId={searchSurfaceId} searchNonce={searchNonce} onCloseSearch={() => setSearchSurfaceId(null)} />
               : <div style={{ color: COLORS.textMuted, padding: 24 }}>No workspace — create one to begin.</div>}
-            {searchOpen && active && <SearchBar surfaceId={effectiveFocus} reopenNonce={searchNonce} onClose={() => setSearchOpen(false)} />}
           </div>
         </div>
         {eventsOpen && (

app/src/LayoutEngine.tsx

@@ -1,6 +1,7 @@
 import { useEffect, useRef, useState } from "react";
 import { Maximize2, Minimize2, RotateCw, GripVertical } from "lucide-react";
 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";
@@ -16,6 +17,11 @@ interface Props {
   focusedId: string | null;
   onFocus: (id: string) => void;
   zoomed: string | null;
+  /** The surface whose scrollback search bar is open, or null. Anchored to the
+   * panel it was opened on — it does NOT follow focus. */
+  searchSurfaceId: string | null;
+  searchNonce: number;
+  onCloseSearch: () => void;
 }
 
 type Edge = "left" | "right" | "top" | "bottom";
@@ -34,7 +40,7 @@ function shortPath(cwd: string): string {
   return leaf ? `~/${leaf}` : cwd;
 }
 
-export function LayoutEngine({ workspaceId, layout, running, states, surfaces, focusedId, onFocus, zoomed }: Props) {
+export function LayoutEngine({ workspaceId, layout, running, states, surfaces, focusedId, onFocus, zoomed, searchSurfaceId, searchNonce, onCloseSearch }: Props) {
   // Panel drag-to-reorder. Implemented with raw pointer events rather than the
   // HTML5 drag API, which is unreliable in the macOS WKWebView Tauri uses.
   const [drop, setDrop] = useState<DropTarget | null>(null);
@@ -72,7 +78,7 @@ export function LayoutEngine({ workspaceId, layout, running, states, surfaces, f
   if (!layout) {
     return <div style={{ color: COLORS.textMuted, padding: 24 }}>Empty workspace — apply a preset to add panels.</div>;
   }
-  const shared = { workspaceId, running, states, surfaces, focusedId, onFocus, zoomed, drop, onStartPanelDrag: startPanelDrag };
+  const shared = { workspaceId, running, states, surfaces, focusedId, onFocus, zoomed, drop, onStartPanelDrag: startPanelDrag, searchSurfaceId, searchNonce, onCloseSearch };
   if (zoomed) {
     return (
       <div style={{ width: "100%", height: "100%", padding: 12, boxSizing: "border-box" }}>
@@ -94,6 +100,9 @@ interface NodeProps {
   zoomed: string | null;
   drop: DropTarget | null;
   onStartPanelDrag: (srcId: string, e: React.MouseEvent) => void;
+  searchSurfaceId: string | null;
+  searchNonce: number;
+  onCloseSearch: () => void;
 }
 
 function Node({ node, path, ...rest }: NodeProps) {
@@ -103,7 +112,7 @@ function Node({ node, path, ...rest }: NodeProps) {
   return <SplitView split={node.split} path={path} {...rest} />;
 }
 
-function Leaf({ id, workspaceId, running, states, surfaces, focusedId, onFocus, zoomed, drop, onStartPanelDrag }: Omit<NodeProps, "node" | "path"> & { id: string }) {
+function Leaf({ id, workspaceId, running, states, surfaces, focusedId, onFocus, zoomed, drop, onStartPanelDrag, searchSurfaceId, searchNonce, onCloseSearch }: Omit<NodeProps, "node" | "path"> & { id: string }) {
   const focused = focusedId === id;
   const dropEdge = drop && drop.id === id ? drop.edge : null;
 
@@ -114,7 +123,11 @@ function Leaf({ id, workspaceId, running, states, surfaces, focusedId, onFocus,
       style={{
         position: "relative", display: "flex", flexDirection: "column", width: "100%", height: "100%",
         background: COLORS.bgPanel, borderRadius: 8, overflow: "hidden",
-        border: focused ? `2px solid ${COLORS.accent}` : `1px solid ${COLORS.borderSubtle}`,
+        // Constant 2px border, color-only on focus. A width change (1px<->2px)
+        // would resize the inner content box, fire ResizeObserver -> fit -> PTY
+        // SIGWINCH, making zsh/powerlevel10k reprint its prompt on every focus
+        // switch (the "stacked prompts" bug).
+        border: `2px solid ${focused ? COLORS.accent : COLORS.borderSubtle}`,
         boxSizing: "border-box",
       }}
     >
@@ -170,6 +183,9 @@ function Leaf({ id, workspaceId, running, states, surfaces, focusedId, onFocus,
       <div style={{ flex: 1, minHeight: 0 }}>
         <TerminalView key={id} surfaceId={id} />
       </div>
+      {searchSurfaceId === id && (
+        <SearchBar surfaceId={id} reopenNonce={searchNonce} onClose={onCloseSearch} />
+      )}
     </>
   );
 }

app/src/SearchBar.tsx

@@ -61,18 +61,20 @@ export function SearchBar({
   return (
     <div
       style={{
+        // Anchored to the focused panel's card (position:relative). Sits over
+        // the 30px header so it's obvious which panel is being searched.
         position: "absolute",
-        top: 8,
+        top: 3,
-        right: 16,
+        right: 6,
         zIndex: 50,
         display: "flex",
         alignItems: "center",
-        gap: 6,
+        gap: 4,
-        height: 32,
+        height: 24,
-        padding: "0 8px",
+        padding: "0 6px",
         background: COLORS.bgElevated,
         border: `1px solid ${COLORS.borderStrong}`,
-        borderRadius: 8,
+        borderRadius: 6,
         boxShadow: "0 4px 16px rgba(0,0,0,0.4)",
       }}
     >
@@ -100,7 +102,7 @@ export function SearchBar({
         }}
         placeholder="Search scrollback"
         style={{
-          width: 200,
+          width: 150,
           background: "transparent",
           border: "none",
           outline: "none",

app/src/TerminalView.tsx

@@ -14,7 +14,10 @@ export function TerminalView({ surfaceId }: { surfaceId: string }) {
 
   useEffect(() => {
     if (!ref.current) return;
-    const term = new Terminal({ fontFamily: "'JetBrains Mono Variable', 'JetBrains Mono', monospace", fontSize: 13, convertEol: false, scrollback: 10000 });
+    // allowProposedApi is required by the search addon: its match decorations
+    // call registerMarker/registerDecoration (proposed API). Without it findNext
+    // throws and the scrollback search counter never updates.
+    const term = new Terminal({ fontFamily: "'JetBrains Mono Variable', 'JetBrains Mono', monospace", fontSize: 13, convertEol: false, scrollback: 10000, allowProposedApi: true });
     try {
       term.loadAddon(new WebglAddon());
     } catch {