CLAUDE.md

@@ -62,6 +62,14 @@ docker exec stdout → tokio task → emit("terminal-output-{sessionId}") → li
   `tabOrder` is user-reorderable (drag, or `Ctrl+Shift+←/→` via `moveActiveTab`) — so **never
   treat a tab's position as identity**: address tabs by key, and index only through `tabOrder`.
   `moveTab` deliberately does not activate what it moves.
+  - **The tab drag is pointer events, not HTML5 drag-and-drop, and must stay that way.** Tauri's
+    `dragDropEnabled` blocks HTML5 drag inside the webview on Windows, and it cannot simply be
+    turned off: `TerminalView` needs Tauri's native drag-drop event because it is the only one
+    that carries dropped *file paths*. An HTML5 drag also carries a `DataTransfer`, which the
+    default handler types into any text field the drag is released over.
+  - **A new app-level shortcut must not swallow a text-editing chord.** `useKeyboardShortcuts`
+    binds on `document` in the capture phase, so `inTextField()` guards the arrow bindings —
+    excluding xterm's helper textarea, which is an input-method shim rather than a field.
 - **`hooks/`** — All Tauri IPC calls are encapsulated in hooks (`useTerminal`, `useProjects`, `useDocker`, `useSettings`)
 - **`lib/tauri-commands.ts`** — Typed `invoke()` wrappers; TypeScript types in `lib/types.ts` must match Rust models
 - **`components/terminal/TerminalView.tsx`** — xterm.js integration with WebGL rendering, URL detection for OAuth flow

HOW-TO-USE.md

@@ -192,10 +192,11 @@ Anthropic-backend project uses that token without its own login. See
   There is no separate terminal tab bar and no "+" button — tabs appear when you open a project or
   a terminal.
 
-  **Drag a tab to reorder it.** A line shows where it will land, and dropping it does not change
-  which tab you are looking at — so you can rearrange the strip without pulling focus away from a
-  terminal that is mid-run. `Ctrl+Shift+←` and `Ctrl+Shift+→` move the *active* tab the same way
-  without the mouse. The order is per-session: it is not saved when you quit.
+  **Drag a tab to reorder it.** A line shows where it will land; **Escape** abandons the drag.
+  Dropping does not change which tab you are looking at — so you can rearrange the strip without
+  pulling focus away from a terminal that is mid-run. `Ctrl+Shift+←` and `Ctrl+Shift+→` move the
+  *active* tab the same way without the mouse (they leave text fields alone, where that chord
+  still selects by word). The order is per-session: it is not saved when you quit.
 - **Status indicators (top right)** — Docker connection and container image availability. Each pairs
   a coloured dot with a word, so status is never conveyed by colour alone. The **?** button opens
   the built-in help.

app/src-tauri/src/browser_view/commands.rs

@@ -128,23 +128,29 @@ pub async fn open_browser_view_popout(
 }
 
 /// Close the pop-out, putting the view back in the tab. No-op if it is closed.
+///
+/// Propagates a failed close rather than reporting success: the pane restores
+/// its iframe on success, and doing that with the window still up puts two
+/// viewers on one browser.
 #[tauri::command]
 pub async fn close_browser_view_popout(
     project_id: String,
     app_handle: AppHandle,
 ) -> Result<(), String> {
-    popout::close(&app_handle, &project_id);
-    Ok(())
+    popout::close(&app_handle, &project_id)
 }
 
-/// Whether the pop-out is open — asked on tab open, since a window can outlive
-/// the pane that spawned it.
+/// Whether the pop-out is open, and whether it is pinned on top.
+///
+/// Read on every pane mount: the window outlives the pane — which is unmounted
+/// whenever another Project Home sub-tab is selected — so neither fact can be
+/// carried in component state.
 #[tauri::command]
-pub async fn is_browser_view_popout_open(
+pub async fn get_browser_view_popout_state(
     project_id: String,
     app_handle: AppHandle,
-) -> Result<bool, String> {
-    Ok(popout::is_open(&app_handle, &project_id))
+) -> Result<popout::PopoutState, String> {
+    Ok(popout::state(&app_handle, &project_id))
 }
 
 /// Pin the pop-out above other windows, so it can be watched while working in

app/src-tauri/src/browser_view/mod.rs

@@ -468,17 +468,33 @@ async fn supervise(
     let _ = kill_dashboard(&container_id, &cli_entry).await;
 
     // Deregister, unless a newer session has already taken this project's slot.
-    {
+    let superseded = {
         let mut map = sessions.lock().await;
-        if map.get(&project_id).is_some_and(|s| s.epoch == epoch) {
-            map.remove(&project_id);
+        match map.get(&project_id) {
+            Some(session) if session.epoch == epoch => {
+                map.remove(&project_id);
+                false
+            }
+            // Someone else owns this project now: `stop` removes the session
+            // from the map *before* awaiting this task, and teardown below is
+            // seconds of Docker work, so a restart in that window is ordinary.
+            Some(_) => true,
+            None => false,
         }
+    };
+
+    // Everything past here speaks for the project as a whole, so a superseded
+    // supervisor must say nothing: closing the pop-out would destroy the *new*
+    // session's window, and the off-status would report a running view as
+    // stopped.
+    if superseded {
+        return;
     }
 
     // A pop-out outlives the tab, so nothing else would take it down: the
     // window would sit there showing a frozen last frame of a viewer that no
     // longer exists. The session owns it, and this is where the session ends.
-    popout::close(&app, &project_id);
+    let _ = popout::close(&app, &project_id);
 
     let enabled = manager().is_enabled(&project_id).await;
     emit(&app, &project_id, &BrowserViewStatus::off(enabled));

app/src-tauri/src/browser_view/popout.rs

@@ -27,15 +27,36 @@
 //! dead viewer is worse than no window. The reverse is not true; closing the
 //! window leaves the view running, and the pane takes it back into the tab.
 
+use serde::Serialize;
 use tauri::{AppHandle, Emitter, Manager, WebviewUrl, WebviewWindowBuilder, WindowEvent};
 
-/// Emitted when a pop-out opens or closes. Payload: `{ project_id, open }`.
+/// Emitted when a pop-out opens or closes. Payload: [`PopoutState`] plus the
+/// project id.
 ///
 /// The window can close without the app asking it to — the user hits its X, or
 /// a teardown takes it — so the pane learns about it the same way it learns
 /// about everything else here, by listening.
 const POPOUT_EVENT: &str = "browser-view-popout-changed";
 
+/// What the pane needs to render its pop-out controls.
+///
+/// Both fields are read from the window itself rather than remembered on either
+/// side: the pane is unmounted whenever another Project Home sub-tab is
+/// selected, so anything it merely *remembers* about the window is gone by the
+/// time the user comes back, while the window is still there.
+#[derive(Debug, Clone, Copy, Serialize)]
+pub struct PopoutState {
+    pub open: bool,
+    pub always_on_top: bool,
+}
+
+impl PopoutState {
+    const CLOSED: Self = Self {
+        open: false,
+        always_on_top: false,
+    };
+}
+
 /// Tauri window labels admit `[a-zA-Z0-9-/:_]` only. Project ids are UUIDs, so
 /// this never fires in practice; it exists so a hand-edited `projects.json`
 /// cannot produce a label Tauri rejects at build time.
@@ -65,7 +86,7 @@ pub fn open(
         let _ = window.unminimize();
         let _ = window.set_focus();
         let _ = window.set_always_on_top(always_on_top);
-        emit(app, project_id, true);
+        emit(app, project_id, state(app, project_id));
         return Ok(());
     }
 
@@ -88,12 +109,12 @@ pub fn open(
     // to take the view back into the tab.
     window.on_window_event(move |event| {
         if matches!(event, WindowEvent::Destroyed) {
-            emit(&app_for_event, &project_id_owned, false);
+            emit(&app_for_event, &project_id_owned, PopoutState::CLOSED);
         }
     });
 
     log::info!("Browser view: popped out for project {}", project_id);
-    emit(app, project_id, true);
+    emit(app, project_id, state(app, project_id));
     Ok(())
 }
 
@@ -102,23 +123,39 @@ pub fn open(
 /// `destroy`, not `close`: `close` raises `CloseRequested`, and the app's
 /// window-event handler treats that as a request to quit for the main window.
 /// Nothing here should ever be able to be mistaken for that.
-pub fn close(app: &AppHandle, project_id: &str) {
+///
+/// A failure is **returned, not logged and forgotten**. The pane puts its
+/// iframe back the moment it believes the window is gone, so reporting a close
+/// that did not happen is how you end up with two viewers driving one browser —
+/// the exact state the iframe is dropped to prevent.
+pub fn close(app: &AppHandle, project_id: &str) -> Result<(), String> {
     if let Some(window) = app.get_webview_window(&window_label(project_id)) {
-        if let Err(e) = window.destroy() {
+        window.destroy().map_err(|e| {
             log::warn!(
                 "Browser view: could not close the pop-out for project {}: {}",
                 project_id,
                 e
             );
-        }
+            format!("Could not close the browser window: {}", e)
+        })?;
     }
-    // Unconditional: `Destroyed` covers the normal path, but a window that was
-    // already gone still owes the pane an answer.
-    emit(app, project_id, false);
+    // `Destroyed` covers the normal path; a window that was already gone still
+    // owes the pane an answer.
+    emit(app, project_id, PopoutState::CLOSED);
+    Ok(())
 }
 
-pub fn is_open(app: &AppHandle, project_id: &str) -> bool {
-    app.get_webview_window(&window_label(project_id)).is_some()
+/// Whether the window exists and how it is stacked, read from the window.
+pub fn state(app: &AppHandle, project_id: &str) -> PopoutState {
+    match app.get_webview_window(&window_label(project_id)) {
+        Some(window) => PopoutState {
+            open: true,
+            // A window that cannot answer is not a reason to fail the call; the
+            // pin is a preference, and "not pinned" is the safe reading.
+            always_on_top: window.is_always_on_top().unwrap_or(false),
+        },
+        None => PopoutState::CLOSED,
+    }
 }
 
 /// Pin the pop-out above other windows, or unpin it. No-op when it is closed.
@@ -128,13 +165,19 @@ pub fn set_always_on_top(app: &AppHandle, project_id: &str, on_top: bool) -> Res
     };
     window
         .set_always_on_top(on_top)
-        .map_err(|e| format!("Could not change the window's stacking: {}", e))
+        .map_err(|e| format!("Could not change the window's stacking: {}", e))?;
+    emit(app, project_id, state(app, project_id));
+    Ok(())
 }
 
-fn emit(app: &AppHandle, project_id: &str, open: bool) {
+fn emit(app: &AppHandle, project_id: &str, state: PopoutState) {
     let _ = app.emit(
         POPOUT_EVENT,
-        serde_json::json!({ "project_id": project_id, "open": open }),
+        serde_json::json!({
+            "project_id": project_id,
+            "open": state.open,
+            "always_on_top": state.always_on_top,
+        }),
     );
 }
 

app/src-tauri/src/lib.rs

@@ -438,7 +438,7 @@ pub fn run() {
             browser_view::commands::install_browser_view_browser,
             browser_view::commands::open_browser_view_popout,
             browser_view::commands::close_browser_view_popout,
-            browser_view::commands::is_browser_view_popout_open,
+            browser_view::commands::get_browser_view_popout_state,
             browser_view::commands::set_browser_view_popout_always_on_top,
             // Shared Claude Code auth token
             commands::auth_token_commands::acquire_claude_token,

app/src/components/layout/MainTabs.test.tsx

@@ -45,33 +45,22 @@ const S1 = terminalTabKey("s1");
 const S2 = terminalTabKey("s2");
 
 /**
- * A stand-in for the DataTransfer jsdom doesn't implement. It only has to
- * carry the tab key, which is what a drop falls back to reading.
+ * A pointer event carrying a real `clientX`.
+ *
+ * jsdom implements no `PointerEvent`, so Testing Library's synthesized one has
+ * no coordinates — and the coordinate is the whole point here, since it decides
+ * which slot the drop lands in. `MouseEvent` has one, and React dispatches on
+ * the event's type name either way.
  */
-function dataTransfer() {
-  const store: Record<string, string> = {};
-  return {
-    effectAllowed: "",
-    dropEffect: "",
-    setData: (format: string, value: string) => {
-      store[format] = value;
-    },
-    getData: (format: string) => store[format] ?? "",
-  };
+function pointer(el: Element, type: string, clientX: number) {
+  fireEvent(el, new MouseEvent(type, { bubbles: true, cancelable: true, clientX, button: 0 }));
 }
 
-/**
- * A dragover carrying a real `clientX`.
- *
- * jsdom has no `DragEvent`, so Testing Library's synthesized one is a plain
- * `Event` with no pointer coordinates — and the coordinate is the whole point
- * here, since it decides which side of a tab the drop lands on. A `MouseEvent`
- * has one, and React reads it the same way.
- */
-function dragOverAt(el: Element, clientX: number, dt: ReturnType<typeof dataTransfer>) {
-  const event = new MouseEvent("dragover", { bubbles: true, cancelable: true, clientX });
-  Object.defineProperty(event, "dataTransfer", { value: dt });
-  fireEvent(el, event);
+/** Press, move past the drag threshold, and release over `endX`. */
+function dragTab(el: Element, fromX: number, endX: number) {
+  pointer(el, "pointerdown", fromX);
+  pointer(el, "pointermove", endX);
+  pointer(el, "pointerup", endX);
 }
 
 /** Pin a tab's geometry so "past the midpoint" means something in jsdom. */
@@ -80,6 +69,13 @@ function place(el: Element, left: number, width = 100) {
     ({ left, width, right: left + width, top: 0, bottom: 30, height: 30, x: left, y: 0 }) as DOMRect;
 }
 
+/** Lay the strip out as three 100px tabs starting at x=0. */
+function laidOut() {
+  const tabs = screen.getAllByRole("tab");
+  tabs.forEach((tab, i) => place(tab, i * 100));
+  return tabs;
+}
+
 const order = () => useAppState.getState().tabOrder;
 
 beforeEach(() => {
@@ -95,73 +91,124 @@ beforeEach(() => {
 describe("MainTabs reordering", () => {
   it("drags a tab to the front", () => {
     render(<MainTabs />);
-    const tabs = screen.getAllByRole("tab");
-    tabs.forEach((tab, i) => place(tab, i * 100));
+    const tabs = laidOut();
 
-    const dt = dataTransfer();
-    fireEvent.dragStart(tabs[2], { dataTransfer: dt });
-    // Left half of the first tab — the marker sits before it.
-    dragOverAt(tabs[0], 10, dt);
-    expect(screen.getByTestId("tab-drop-marker")).toBeInTheDocument();
-    fireEvent.drop(tabs[0], { dataTransfer: dt });
+    // Left half of the first tab — the tab lands before it.
+    dragTab(tabs[2], 250, 10);
 
     expect(order()).toEqual([S2, HOME, S1]);
   });
 
   it("drops after the tab when the pointer is past its midpoint", () => {
     render(<MainTabs />);
-    const tabs = screen.getAllByRole("tab");
-    tabs.forEach((tab, i) => place(tab, i * 100));
+    const tabs = laidOut();
 
-    const dt = dataTransfer();
-    fireEvent.dragStart(tabs[0], { dataTransfer: dt });
-    dragOverAt(tabs[1], 190, dt);
-    fireEvent.drop(tabs[1], { dataTransfer: dt });
+    dragTab(tabs[0], 50, 190);
 
     expect(order()).toEqual([S1, HOME, S2]);
   });
 
+  it("drops at the end when released past the last tab", () => {
+    render(<MainTabs />);
+    const tabs = laidOut();
+
+    dragTab(tabs[0], 50, 800);
+
+    expect(order()).toEqual([S1, S2, HOME]);
+  });
+
   it("dragging does not steal the selection", () => {
     render(<MainTabs />);
-    const tabs = screen.getAllByRole("tab");
-    tabs.forEach((tab, i) => place(tab, i * 100));
+    const tabs = laidOut();
 
-    const dt = dataTransfer();
-    fireEvent.dragStart(tabs[1], { dataTransfer: dt });
-    dragOverAt(tabs[2], 290, dt);
-    fireEvent.drop(tabs[2], { dataTransfer: dt });
+    dragTab(tabs[1], 150, 290);
 
     expect(order()).toEqual([HOME, S2, S1]);
     expect(useAppState.getState().activeTabKey).toBe(HOME);
   });
 
-  it("shows no drop marker until a drag is under way", () => {
+  it("shows the drop marker only while a drag is under way", () => {
     render(<MainTabs />);
+    const tabs = laidOut();
+    expect(screen.queryByTestId("tab-drop-marker")).toBeNull();
+
+    pointer(tabs[2], "pointerdown", 250);
+    pointer(tabs[2], "pointermove", 10);
+    expect(screen.getByTestId("tab-drop-marker")).toBeInTheDocument();
+
+    pointer(tabs[2], "pointerup", 10);
     expect(screen.queryByTestId("tab-drop-marker")).toBeNull();
   });
 
-  it("clears the marker when the drag ends without a drop", () => {
+  it("abandons the drag on Escape, leaving the order alone", () => {
     render(<MainTabs />);
-    const tabs = screen.getAllByRole("tab");
-    tabs.forEach((tab, i) => place(tab, i * 100));
+    const tabs = laidOut();
 
-    const dt = dataTransfer();
-    fireEvent.dragStart(tabs[2], { dataTransfer: dt });
-    dragOverAt(tabs[0], 10, dt);
-    fireEvent.dragEnd(tabs[2], { dataTransfer: dt });
+    pointer(tabs[2], "pointerdown", 250);
+    pointer(tabs[2], "pointermove", 10);
+    fireEvent.keyDown(window, { key: "Escape" });
+
+    expect(screen.queryByTestId("tab-drop-marker")).toBeNull();
+    pointer(tabs[2], "pointerup", 10);
+    expect(order()).toEqual([HOME, S1, S2]);
+  });
+
+  it("treats a press that barely moves as a click, not a drag", () => {
+    render(<MainTabs />);
+    const tabs = laidOut();
+
+    // Two pixels of tremble, under the threshold.
+    pointer(tabs[2], "pointerdown", 250);
+    pointer(tabs[2], "pointermove", 252);
+    pointer(tabs[2], "pointerup", 252);
+    fireEvent.click(tabs[2]);
+
+    expect(order()).toEqual([HOME, S1, S2]);
+    expect(useAppState.getState().activeTabKey).toBe(S2);
+  });
+
+  it("does not select the tab it just dropped", () => {
+    render(<MainTabs />);
+    const tabs = laidOut();
+
+    dragTab(tabs[2], 250, 10);
+    // The browser fires a click after the pointerup that ended the drag.
+    fireEvent.click(tabs[2]);
+
+    expect(order()).toEqual([S2, HOME, S1]);
+    expect(useAppState.getState().activeTabKey).toBe(HOME);
+  });
+
+  it("ignores a press that starts on the close button", () => {
+    render(<MainTabs />);
+    const tabs = laidOut();
+    const close = screen.getByRole("button", { name: "Close shell (bash)" });
+
+    fireEvent(close, new MouseEvent("pointerdown", { bubbles: true, clientX: 290, button: 0 }));
+    pointer(tabs[2], "pointermove", 10);
 
     expect(screen.queryByTestId("tab-drop-marker")).toBeNull();
     expect(order()).toEqual([HOME, S1, S2]);
   });
 
-  it("leaves a tab being renamed undraggable, so its text stays selectable", () => {
+  it("does not drag a tab that is being renamed — that drag selects text", () => {
     render(<MainTabs />);
-    const tabs = screen.getAllByRole("tab");
-    expect(tabs[1]).toHaveAttribute("draggable", "true");
-
+    const tabs = laidOut();
     fireEvent.doubleClick(tabs[1]);
-
     expect(screen.getByLabelText("Rename tab")).toBeInTheDocument();
-    expect(screen.getAllByRole("tab")[1]).toHaveAttribute("draggable", "false");
+
+    dragTab(screen.getAllByRole("tab")[1], 150, 10);
+
+    expect(order()).toEqual([HOME, S1, S2]);
+  });
+
+  it("carries no drag payload that another element could receive", () => {
+    // An HTML5 drag would put the tab key in a DataTransfer, and releasing over
+    // any text field in the app would type `term:…` into it. Pointer events
+    // have nothing to hand over, and the tabs are not draggable at all.
+    render(<MainTabs />);
+    for (const tab of screen.getAllByRole("tab")) {
+      expect(tab).not.toHaveAttribute("draggable", "true");
+    }
   });
 });

app/src/components/layout/MainTabs.tsx

@@ -18,6 +18,9 @@ interface ContextMenuState {
   y: number;
 }
 
+/** Pixels of horizontal travel before a press becomes a drag rather than a click. */
+const DRAG_THRESHOLD = 4;
+
 const MODE_BADGE: Record<PermissionMode, { text: string; className: string }> = {
   plan: { text: "plan", className: "bg-[var(--bg-tertiary)] text-[var(--text-secondary)]" },
   default: { text: "ask", className: "bg-[var(--bg-tertiary)] text-[var(--text-secondary)]" },
@@ -29,9 +32,8 @@ const MODE_BADGE: Record<PermissionMode, { text: string; className: string }> =
  * One strip for both main-area tab kinds: Project Home views (⌂) and
  * terminals (▣).
  *
- * Tabs are draggable. The drag is HTML5's, not a pointer-event
- * reimplementation, so the OS supplies the drag image and the Escape-to-cancel
- * behaviour for free; the only thing tracked here is where the drop would land.
+ * Tabs are draggable, on pointer events rather than HTML5 drag-and-drop — see
+ * `pointerProps` for why neither of the two obvious alternatives works.
  * `Ctrl+Shift+←/→` does the same thing without a mouse.
  */
 export default function MainTabs() {
@@ -53,6 +55,10 @@ export default function MainTabs() {
   /** The tab being dragged, and the slot it would drop into. */
   const [dragKey, setDragKey] = useState<string | null>(null);
   const [dropIndex, setDropIndex] = useState<number | null>(null);
+  const stripRef = useRef<HTMLDivElement>(null);
+  /** A press that has not yet moved far enough to be a drag. */
+  const pending = useRef<{ key: string; startX: number; dragging: boolean } | null>(null);
+  const suppressClick = useRef(false);
 
   useEffect(() => {
     if (!menu) return;
@@ -72,6 +78,20 @@ export default function MainTabs() {
     }
   }, [renamingId]);
 
+  // Escape abandons a drag — the one affordance a pointer-event drag has to
+  // supply for itself, since the OS is not running this one.
+  useEffect(() => {
+    if (!dragKey) return;
+    const onKeyDown = (e: KeyboardEvent) => {
+      if (e.key !== "Escape") return;
+      pending.current = null;
+      setDragKey(null);
+      setDropIndex(null);
+    };
+    window.addEventListener("keydown", onKeyDown);
+    return () => window.removeEventListener("keydown", onKeyDown);
+  }, [dragKey]);
+
   if (tabOrder.length === 0) {
     return (
       <div className="px-3 text-xs text-[var(--text-secondary)] leading-10">
@@ -152,54 +172,91 @@ export default function MainTabs() {
     }${dragging ? " opacity-40" : ""}`;
 
   const endDrag = () => {
+    pending.current = null;
     setDragKey(null);
     setDropIndex(null);
   };
 
   /**
-   * Drag props shared by both tab kinds.
+   * Which slot the pointer is currently over, as an insertion index into
+   * `tabOrder`.
    *
-   * A tab in rename mode is not draggable: a `draggable` ancestor swallows the
-   * mouse-drag that selects text inside the input, which would make the rename
-   * field impossible to select in.
+   * Measured from the tabs actually on screen rather than from the event's
+   * target, so the answer is the same whatever the pointer happens to be over —
+   * including the drop marker itself, and including a `tabOrder` entry whose
+   * session has already gone and which therefore renders nothing.
    */
-  const dragProps = (key: string, index: number, renaming: boolean) => ({
-    draggable: !renaming,
-    onDragStart: (e: React.DragEvent<HTMLDivElement>) => {
-      e.dataTransfer.effectAllowed = "move";
-      // Some platforms refuse to start a drag with an empty payload.
-      e.dataTransfer.setData("text/plain", key);
-      setDragKey(key);
-      setDropIndex(index);
+  const dropIndexAt = (clientX: number): number => {
+    const strip = stripRef.current;
+    if (!strip) return tabOrder.length;
+    for (const el of strip.querySelectorAll<HTMLElement>("[data-tab-index]")) {
+      const rect = el.getBoundingClientRect();
+      if (clientX < rect.left + rect.width / 2) return Number(el.dataset.tabIndex);
+    }
+    return tabOrder.length;
+  };
+
+  /**
+   * Dragging is done with pointer events, not HTML5 drag-and-drop.
+   *
+   * Two reasons, both load-bearing. Tauri's `dragDropEnabled` — which the
+   * terminal needs left on, because only the native drag-drop event carries
+   * dropped *file paths* — blocks HTML5 drag inside the webview on Windows, so
+   * an HTML5 implementation is simply dead there. And an HTML5 drag carries a
+   * `DataTransfer`: released over any text field in the app, the default
+   * handler types the payload into it.
+   */
+  const pointerProps = (key: string, renaming: boolean) => ({
+    onPointerDown: (e: React.PointerEvent<HTMLDivElement>) => {
+      // Left button only, never from the close button, and never while the
+      // rename input is up — that drag is a text selection.
+      if (e.button !== 0 || renaming) return;
+      if ((e.target as HTMLElement).closest("button, input")) return;
+      pending.current = { key, startX: e.clientX, dragging: false };
+      e.currentTarget.setPointerCapture?.(e.pointerId);
     },
-    onDragOver: (e: React.DragEvent<HTMLDivElement>) => {
-      if (!dragKey) return; // not our drag — a file dropped on the strip isn't one
-      e.preventDefault();
-      e.dataTransfer.dropEffect = "move";
-      const rect = e.currentTarget.getBoundingClientRect();
-      const after = e.clientX > rect.left + rect.width / 2;
-      setDropIndex(index + (after ? 1 : 0));
+    onPointerMove: (e: React.PointerEvent<HTMLDivElement>) => {
+      const drag = pending.current;
+      if (!drag) return;
+      // A few pixels of slop, so a click that trembles stays a click.
+      if (!drag.dragging && Math.abs(e.clientX - drag.startX) < DRAG_THRESHOLD) return;
+      drag.dragging = true;
+      setDragKey(drag.key);
+      setDropIndex(dropIndexAt(e.clientX));
     },
-    onDragEnd: endDrag,
+    onPointerUp: (e: React.PointerEvent<HTMLDivElement>) => {
+      const drag = pending.current;
+      e.currentTarget.releasePointerCapture?.(e.pointerId);
+      if (!drag?.dragging) {
+        pending.current = null;
+        return; // a plain click: leave it to `onClick` to select the tab
+      }
+      const to = dropIndexAt(e.clientX);
+      const from = tabOrder.indexOf(drag.key);
+      // `to` is a slot in the strip as it looks *now*; `moveTab` places the tab
+      // after pulling it out, so every slot past its own shifts down one.
+      if (from !== -1) moveTab(drag.key, to > from ? to - 1 : to);
+      // The click that follows this pointerup is the drag's, not a selection.
+      suppressClick.current = true;
+      endDrag();
+    },
+    onPointerCancel: endDrag,
   });
 
-  /** Drop lands wherever the marker is showing, and only there. */
-  const onDrop = (e: React.DragEvent<HTMLDivElement>) => {
-    const key = dragKey ?? e.dataTransfer.getData("text/plain");
-    if (!key || dropIndex === null) return endDrag();
-    e.preventDefault();
-    const from = tabOrder.indexOf(key);
-    // `dropIndex` is a slot in the strip as it looks *now*; `moveTab` places the
-    // tab after pulling it out, so every slot past the tab's own shifts down one.
-    moveTab(key, dropIndex > from ? dropIndex - 1 : dropIndex);
-    endDrag();
+  /** A drag in progress swallows the click it ends with. */
+  const activateTab = (key: string) => {
+    if (suppressClick.current) {
+      suppressClick.current = false;
+      return;
+    }
+    setActiveTabKey(key);
   };
 
   const dropMarker = (
     <div
       aria-hidden="true"
       data-testid="tab-drop-marker"
-      className="w-0.5 -mx-px h-full bg-[var(--accent)] flex-shrink-0"
+      className="w-0.5 -mx-px h-full bg-[var(--accent)] flex-shrink-0 pointer-events-none"
     />
   );
 
@@ -215,14 +272,15 @@ export default function MainTabs() {
           role="tab"
           aria-selected={active}
           tabIndex={0}
-          onClick={() => setActiveTabKey(key)}
+          data-tab-index={index}
+          onClick={() => activateTab(key)}
           onKeyDown={(e) => {
             if (e.key === "Enter" || e.key === " ") {
               e.preventDefault();
               setActiveTabKey(key);
             }
           }}
-          {...dragProps(key, index, false)}
+          {...pointerProps(key, false)}
           className={tabClass(active, dragKey === key)}
         >
           <span aria-hidden="true" className="text-[var(--text-secondary)]">⌂</span>
@@ -265,7 +323,8 @@ export default function MainTabs() {
         role="tab"
         aria-selected={active}
         tabIndex={0}
-        onClick={() => setActiveTabKey(terminalTabKey(session.id))}
+        data-tab-index={index}
+        onClick={() => activateTab(terminalTabKey(session.id))}
         onKeyDown={(e) => {
           if (e.key === "Enter" || e.key === " ") {
             e.preventDefault();
@@ -277,7 +336,7 @@ export default function MainTabs() {
           setMenu({ sessionId: session.id, x: e.clientX, y: e.clientY });
         }}
         onDoubleClick={() => startRename(session.id)}
-        {...dragProps(key, index, isRenaming)}
+        {...pointerProps(key, isRenaming)}
         className={tabClass(active, dragKey === key)}
       >
         <span aria-hidden="true" className="text-[var(--text-secondary)]">▣</span>
@@ -324,26 +383,22 @@ export default function MainTabs() {
     );
   };
 
+  // The marker goes before the first tab that is *actually on screen* at or
+  // past the drop slot. Addressing it by raw index would lose it whenever a
+  // `tabOrder` entry renders nothing — the window between a session ending and
+  // the store dropping its key — leaving the drag with no visible target.
+  let markerPending = dragKey !== null && dropIndex !== null;
+
   return (
-    <div
-      className="flex items-center h-full"
-      role="tablist"
-      aria-label="Open tabs"
-      onDrop={onDrop}
-      onDragLeave={(e) => {
-        // Leaving the strip entirely (not crossing between tabs) parks the
-        // marker, so a drag aborted outside doesn't leave one behind.
-        if (!e.currentTarget.contains(e.relatedTarget as Node | null)) {
-          setDropIndex(null);
-        }
-      }}
-    >
+    <div ref={stripRef} className="flex items-center h-full" role="tablist" aria-label="Open tabs">
       {tabOrder.map((key, index) => {
         const tab = renderTab(key, index);
         if (!tab) return null;
+        const marker = markerPending && index >= (dropIndex ?? 0);
+        if (marker) markerPending = false;
         return (
           <Fragment key={key}>
-            {dragKey !== null && dropIndex === index && dropMarker}
+            {marker && dropMarker}
             {tab}
           </Fragment>
         );
@@ -351,17 +406,7 @@ export default function MainTabs() {
 
       {/* The empty run after the last tab is a drop target too — it is where
           the hand naturally goes to say "put it at the end". */}
-      <div
-        className="flex-1 self-stretch"
-        onDragOver={(e) => {
-          if (!dragKey) return;
-          e.preventDefault();
-          e.dataTransfer.dropEffect = "move";
-          setDropIndex(tabOrder.length);
-        }}
-      >
-        {dragKey !== null && dropIndex === tabOrder.length && dropMarker}
-      </div>
+      <div className="flex-1 self-stretch">{markerPending && dropMarker}</div>
 
       {menu && (() => {
         const session = sessions.find((s) => s.id === menu.sessionId);

app/src/components/projects/home/BrowserTab.test.tsx

@@ -15,7 +15,8 @@ const installBrowserViewSupport = vi.fn<() => Promise<BrowserSetupOutcome>>();
 const installBrowserViewBrowser = vi.fn<(id: string, b: string) => Promise<BrowserSetupOutcome>>();
 const openBrowserViewPopout = vi.fn<(id: string, onTop: boolean) => Promise<void>>();
 const closeBrowserViewPopout = vi.fn<(id: string) => Promise<void>>();
-const isBrowserViewPopoutOpen = vi.fn<() => Promise<boolean>>();
+const getBrowserViewPopoutState =
+  vi.fn<() => Promise<{ open: boolean; always_on_top: boolean }>>();
 const setBrowserViewPopoutAlwaysOnTop = vi.fn<(id: string, onTop: boolean) => Promise<void>>();
 const pushToast = vi.fn();
 const setContainerProgress = vi.fn();
@@ -28,7 +29,7 @@ vi.mock("../../../lib/tauri-commands", () => ({
   installBrowserViewBrowser: (id: string, b: string) => installBrowserViewBrowser(id, b),
   openBrowserViewPopout: (id: string, onTop: boolean) => openBrowserViewPopout(id, onTop),
   closeBrowserViewPopout: (id: string) => closeBrowserViewPopout(id),
-  isBrowserViewPopoutOpen: () => isBrowserViewPopoutOpen(),
+  getBrowserViewPopoutState: () => getBrowserViewPopoutState(),
   setBrowserViewPopoutAlwaysOnTop: (id: string, onTop: boolean) =>
     setBrowserViewPopoutAlwaysOnTop(id, onTop),
 }));
@@ -120,7 +121,7 @@ beforeEach(() => {
   storeState.containerProgress = {};
   getBrowserViewStatus.mockResolvedValue(OFF);
   checkBrowserViewSupport.mockResolvedValue(READY);
-  isBrowserViewPopoutOpen.mockResolvedValue(false);
+  getBrowserViewPopoutState.mockResolvedValue({ open: false, always_on_top: false });
   openBrowserViewPopout.mockResolvedValue(undefined);
   closeBrowserViewPopout.mockResolvedValue(undefined);
   setBrowserViewPopoutAlwaysOnTop.mockResolvedValue(undefined);
@@ -406,16 +407,17 @@ describe("BrowserTab", () => {
     });
 
     await act(async () => {
-      fireEvent.click(screen.getByRole("switch", { name: /above other windows/i }));
+      // The accessible name is the visible text, as with every other Toggle.
+      fireEvent.click(screen.getByRole("switch", { name: "Keep on top" }));
     });
 
     expect(setBrowserViewPopoutAlwaysOnTop).toHaveBeenCalledWith("p1", true);
   });
 
   it("keeps a pop-out that outlived the tab, rather than showing an empty pane", async () => {
-    // The window belongs to the backend, so reopening the tab has to read its
+    // The window belongs to the backend, so remounting the pane has to read its
     // state back — otherwise the pane would render an iframe alongside it.
-    isBrowserViewPopoutOpen.mockResolvedValue(true);
+    getBrowserViewPopoutState.mockResolvedValue({ open: true, always_on_top: true });
     checkBrowserViewSupport.mockResolvedValue({ ...READY, browsers: ["chromium-1200"] });
     getBrowserViewStatus.mockResolvedValue(LIVE);
 
@@ -423,6 +425,33 @@ describe("BrowserTab", () => {
 
     expect(await screen.findByText(/in its own window/i)).toBeInTheDocument();
     expect(screen.queryByTitle(/browser view for/i)).toBeNull();
+    // The pin is read from the window too — the pane is unmounted every time
+    // another sub-tab is selected, so remembering it would show Off over a
+    // window that is still floating on top.
+    expect(screen.getByRole("switch", { name: "Keep on top" })).toBeChecked();
+  });
+
+  it("never mounts the iframe before the window's state is known", async () => {
+    // The status and the pop-out state are two separate round trips. If the
+    // status wins the race, guessing "not popped out" would flash a second
+    // viewer onto a browser the window is already driving.
+    checkBrowserViewSupport.mockResolvedValue({ ...READY, browsers: ["chromium-1200"] });
+    getBrowserViewStatus.mockResolvedValue(LIVE);
+    let answer: (s: { open: boolean; always_on_top: boolean }) => void = () => {};
+    getBrowserViewPopoutState.mockReturnValue(
+      new Promise((resolve) => {
+        answer = resolve;
+      }),
+    );
+
+    render(<BrowserTab project={project} active />);
+    await waitFor(() => expect(screen.getByText("Live")).toBeInTheDocument());
+    expect(screen.queryByTitle(/browser view for/i)).toBeNull();
+
+    await act(async () => {
+      answer({ open: false, always_on_top: false });
+    });
+    expect(await screen.findByTitle("Playwright browser view for api-server")).toBeInTheDocument();
   });
 
   it("says why the window wouldn’t open instead of pretending it did", async () => {

app/src/components/projects/home/BrowserTab.tsx

@@ -15,7 +15,7 @@ import {
   getBrowserViewStatus,
   installBrowserViewBrowser,
   installBrowserViewSupport,
-  isBrowserViewPopoutOpen,
+  getBrowserViewPopoutState,
   openBrowserViewPopout,
   setBrowserViewEnabled,
   setBrowserViewPopoutAlwaysOnTop,
@@ -72,8 +72,13 @@ export default function BrowserTab({ project, active }: Props) {
   const [job, setJob] = useState<SetupJob>(null);
   const [outcome, setOutcome] = useState<BrowserSetupOutcome | null>(null);
   const [setupError, setSetupError] = useState<string | null>(null);
-  /** Whether the view is currently in its own window instead of this pane. */
-  const [poppedOut, setPoppedOut] = useState(false);
+  /**
+   * Whether the view is in its own window instead of this pane, and whether
+   * that window is pinned. `null` means "not asked yet" — a distinct state from
+   * "not popped out", because rendering the iframe on a guess is what puts a
+   * second viewer on the browser.
+   */
+  const [poppedOut, setPoppedOut] = useState<boolean | null>(null);
   const [onTop, setOnTop] = useState(false);
   const pushToast = useAppState((s) => s.pushToast);
   const setContainerProgress = useAppState((s) => s.setContainerProgress);
@@ -112,7 +117,7 @@ export default function BrowserTab({ project, active }: Props) {
     listen<BrowserViewPopoutChangedEvent>("browser-view-popout-changed", (event) => {
       if (event.payload.project_id === projectId && mounted.current) {
         setPoppedOut(event.payload.open);
-        if (!event.payload.open) setOnTop(false);
+        setOnTop(event.payload.always_on_top);
       }
     }).then((un) => {
       if (mounted.current) dispose = un;
@@ -123,9 +128,15 @@ export default function BrowserTab({ project, active }: Props) {
 
   useEffect(() => {
     if (!active || !running) return;
-    isBrowserViewPopoutOpen(projectId)
-      .then((open) => mounted.current && setPoppedOut(open))
-      .catch(() => {});
+    getBrowserViewPopoutState(projectId)
+      .then((s) => {
+        if (!mounted.current) return;
+        setPoppedOut(s.open);
+        setOnTop(s.always_on_top);
+      })
+      // Unreachable in practice, but a pane stuck at "not asked yet" would
+      // never show the view at all — so fail towards the tab.
+      .catch(() => mounted.current && setPoppedOut(false));
     getBrowserViewStatus(projectId)
       .then((s) => mounted.current && setStatus(s))
       .catch(() => {});
@@ -304,22 +315,21 @@ export default function BrowserTab({ project, active }: Props) {
           </span>
         )}
         <div className="flex-1" />
-        {live && poppedOut && (
-          <label className="flex items-center gap-1.5 text-xs text-[var(--text-secondary)]">
+        {live && poppedOut === true && (
+          <span className="flex items-center gap-1.5 text-xs text-[var(--text-secondary)]">
             Keep on top
-            <Toggle
-              checked={onTop}
-              onChange={toggleOnTop}
-              label="Keep the browser window above other windows"
-            />
-          </label>
+            {/* The accessible name matches the visible text, as everywhere else
+                a Toggle is used — a `<label>` around it would be inert anyway,
+                since a Toggle renders a button. */}
+            <Toggle checked={onTop} onChange={toggleOnTop} label="Keep on top" />
+          </span>
         )}
-        {live && !poppedOut && (
+        {live && poppedOut === false && (
           <Button size="md" onClick={() => setReloadKey((k) => k + 1)}>
             Reload
           </Button>
         )}
-        {live && (
+        {live && poppedOut !== null && (
           <Button size="md" onClick={poppedOut ? popIn : popOut}>
             {poppedOut ? "Put back in tab" : "Open in own window"}
           </Button>
@@ -334,7 +344,7 @@ export default function BrowserTab({ project, active }: Props) {
         </Button>
       </div>
 
-      {live && poppedOut ? (
+      {live && poppedOut === true ? (
         // The iframe is unmounted while the window is up, on purpose. Two
         // viewers on one browser both work, but both also *drive* it — two
         // cursors taking over the same page is not a feature.
@@ -355,7 +365,7 @@ export default function BrowserTab({ project, active }: Props) {
             </div>
           </div>
         </div>
-      ) : live ? (
+      ) : live && poppedOut === false ? (
         <iframe
           key={reloadKey}
           // Loopback only, and the URL carries the one-time session token the
@@ -364,6 +374,11 @@ export default function BrowserTab({ project, active }: Props) {
           title={`Playwright browser view for ${project.name}`}
           className="flex-1 min-h-0 w-full border-0 bg-[var(--bg-primary)]"
         />
+      ) : live ? (
+        // Live, but the window's state hasn't come back yet. An instant, and
+        // deliberately empty: guessing "not popped out" here is what would
+        // flash a second viewer onto the browser.
+        <div className="flex-1 min-h-0" />
       ) : (
         <div className="flex-1 min-h-0 overflow-y-auto">
           {/* Setup stays on screen while an install is running and after it

app/src/hooks/useKeyboardShortcuts.test.tsx

@@ -0,0 +1,88 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
+import { renderHook } from "@testing-library/react";
+import { useKeyboardShortcuts } from "./useKeyboardShortcuts";
+import { useAppState, homeTabKey, terminalTabKey } from "../store/appState";
+
+vi.mock("./useTerminal", () => ({
+  useTerminal: () => ({ open: vi.fn(), close: vi.fn() }),
+}));
+
+const HOME = homeTabKey("p1");
+const S1 = terminalTabKey("s1");
+const S2 = terminalTabKey("s2");
+
+const order = () => useAppState.getState().tabOrder;
+
+/** Press a chord, from whatever is focused. */
+function press(key: string, { shift = false } = {}) {
+  document.dispatchEvent(
+    new KeyboardEvent("keydown", { key, ctrlKey: true, shiftKey: shift, bubbles: true }),
+  );
+}
+
+/** Focus a real element of the given kind, inside `parent` if given. */
+function focus(tag: "input" | "textarea", parentClass?: string): HTMLElement {
+  const el = document.createElement(tag);
+  if (parentClass) {
+    const parent = document.createElement("div");
+    parent.className = parentClass;
+    parent.appendChild(el);
+    document.body.appendChild(parent);
+  } else {
+    document.body.appendChild(el);
+  }
+  el.focus();
+  return el;
+}
+
+beforeEach(() => {
+  useAppState.setState({ tabOrder: [HOME, S1, S2], activeTabKey: S1, activeSessionId: "s1" });
+});
+
+afterEach(() => {
+  document.body.innerHTML = "";
+});
+
+describe("Ctrl+Shift+←/→", () => {
+  it("moves the active tab along the strip", () => {
+    renderHook(() => useKeyboardShortcuts());
+
+    press("ArrowLeft", { shift: true });
+    expect(order()).toEqual([S1, HOME, S2]);
+
+    press("ArrowRight", { shift: true });
+    expect(order()).toEqual([HOME, S1, S2]);
+  });
+
+  it("leaves word-wise selection alone in a text field", () => {
+    // Ctrl+Shift+←/→ already means "extend the selection by a word" in every
+    // input in the app — the rename field, Config fields, Settings fields.
+    // Taking it there would break selection *and* silently reorder tabs.
+    renderHook(() => useKeyboardShortcuts());
+    focus("input");
+
+    press("ArrowLeft", { shift: true });
+
+    expect(order()).toEqual([HOME, S1, S2]);
+  });
+
+  it("still moves tabs from the terminal, whose focus lives in a textarea", () => {
+    // xterm keeps a hidden textarea focused as its input-method shim. It is
+    // not a field anyone edits word-wise, and the terminal is where these
+    // shortcuts matter most, so it is not treated as one.
+    renderHook(() => useKeyboardShortcuts());
+    focus("textarea", "xterm xterm-helper-textarea-host");
+
+    press("ArrowLeft", { shift: true });
+
+    expect(order()).toEqual([S1, HOME, S2]);
+  });
+
+  it("does nothing without Shift — that chord is readline's word motion", () => {
+    renderHook(() => useKeyboardShortcuts());
+
+    press("ArrowLeft");
+
+    expect(order()).toEqual([HOME, S1, S2]);
+  });
+});

app/src/hooks/useKeyboardShortcuts.ts

@@ -2,6 +2,22 @@ import { useEffect } from "react";
 import { useAppState, isTerminalTab, tabKeyId } from "../store/appState";
 import { useTerminal } from "./useTerminal";
 
+/**
+ * Whether the focus is in something the user is editing text in.
+ *
+ * xterm's hidden textarea is deliberately excluded: it is an input-method
+ * shim, not a field anyone edits word-wise, and the terminal is exactly where
+ * the tab shortcuts need to keep working.
+ */
+function inTextField(el: Element | null): boolean {
+  if (!el || el.closest(".xterm")) return false;
+  return (
+    el.tagName === "INPUT" ||
+    el.tagName === "TEXTAREA" ||
+    (el as HTMLElement).isContentEditable === true
+  );
+}
+
 /**
  * App-level shortcuts. Registered on `document` in the *capture* phase so they
  * win over xterm.js, which would otherwise forward them to the shell inside
@@ -55,8 +71,13 @@ export function useKeyboardShortcuts() {
       // Ctrl+Shift+←/→ — move the active tab, the keyboard route to what
       // dragging a tab does. Shift is what keeps it clear of the terminal:
       // Ctrl+←/→ is readline's word-wise cursor motion.
+      //
+      // In a text field this chord already means "extend the selection by a
+      // word", which is not ours to take: swallowing it would make word-wise
+      // selection impossible in every input in the app *and* silently reorder
+      // the strip each time someone tried it.
       if (e.shiftKey && (e.key === "ArrowLeft" || e.key === "ArrowRight")) {
-        if (!state.activeTabKey) return;
+        if (!state.activeTabKey || inTextField(document.activeElement)) return;
         e.preventDefault();
         e.stopPropagation();
         state.moveActiveTab(e.key === "ArrowLeft" ? -1 : 1);

app/src/lib/tauri-commands.ts

@@ -1,5 +1,5 @@
 import { invoke } from "@tauri-apps/api/core";
-import type { Project, ProjectPath, ContainerInfo, SiblingContainer, AppSettings, UpdateInfo, ImageUpdateInfo, FileEntry, WebTerminalInfo, SttStatus, GatewayStatus, InstallOptions, ClaudeSession, ContainerCapabilities, ScheduledTask, ScheduledTaskInput, SchedulerNotification, AuthBridgeStatus, BrowserViewStatus, PlaywrightDetection, BrowserSetupOutcome, BrowserInstallTarget, ContainerStaleness, MigrationOptions, MigrationReport, MigrationState, ClearTokenOutcome, CaCertInfo } from "./types";
+import type { Project, ProjectPath, ContainerInfo, SiblingContainer, AppSettings, UpdateInfo, ImageUpdateInfo, FileEntry, WebTerminalInfo, SttStatus, GatewayStatus, InstallOptions, ClaudeSession, ContainerCapabilities, ScheduledTask, ScheduledTaskInput, SchedulerNotification, AuthBridgeStatus, BrowserViewStatus, BrowserViewPopoutState, PlaywrightDetection, BrowserSetupOutcome, BrowserInstallTarget, ContainerStaleness, MigrationOptions, MigrationReport, MigrationState, ClearTokenOutcome, CaCertInfo } from "./types";
 
 // Docker
 export const checkDocker = () => invoke<boolean>("check_docker");
@@ -213,9 +213,15 @@ export const openBrowserViewPopout = (projectId: string, alwaysOnTop: boolean) =
 /** Close the pop-out and put the view back in the tab. No-op if it isn't open. */
 export const closeBrowserViewPopout = (projectId: string) =>
   invoke<void>("close_browser_view_popout", { projectId });
-/** Asked on tab open: the window outlives the pane, so its state has to be read back. */
-export const isBrowserViewPopoutOpen = (projectId: string) =>
-  invoke<boolean>("is_browser_view_popout_open", { projectId });
+/**
+ * Whether the pop-out is open and whether it is pinned, read from the window.
+ *
+ * Asked on every mount: the pane is unmounted whenever another Project Home
+ * sub-tab is selected, while the window carries on — so neither fact can live
+ * in component state and survive.
+ */
+export const getBrowserViewPopoutState = (projectId: string) =>
+  invoke<BrowserViewPopoutState>("get_browser_view_popout_state", { projectId });
 /** Pin the pop-out above other windows — the point of popping it out at all. */
 export const setBrowserViewPopoutAlwaysOnTop = (projectId: string, onTop: boolean) =>
   invoke<void>("set_browser_view_popout_always_on_top", { projectId, onTop });

app/src/lib/types.ts

@@ -515,15 +515,27 @@ export interface BrowserViewChangedEvent {
 }
 
 /**
- * Payload of the `browser-view-popout-changed` event.
+ * Mirrors Rust `PopoutState` — read from the window, never remembered.
+ *
+ * The pane is unmounted whenever another Project Home sub-tab is selected while
+ * the window carries on, so anything it holds in component state is stale by
+ * the time the user comes back.
+ */
+export interface BrowserViewPopoutState {
+  open: boolean;
+  always_on_top: boolean;
+}
+
+/**
+ * Payload of the `browser-view-popout-changed` event: a `BrowserViewPopoutState`
+ * plus the project it belongs to.
  *
  * The pop-out window can close without the pane asking — the user hits its X,
  * or the session tears down and takes it — so this is the only reliable way to
  * know whether it is on screen.
  */
-export interface BrowserViewPopoutChangedEvent {
+export interface BrowserViewPopoutChangedEvent extends BrowserViewPopoutState {
   project_id: string;
-  open: boolean;
 }
 
 /** Payload of the `claude-token-progress` event: milestones during