canvas/BatchActionBar: wire Esc to clear selection (matches button title)

Two small fixes for the batch-action toolbar:

1. The deselect button's title says "Clear selection (Escape)" — but
   pressing Escape did NOTHING. The title has been lying since the bar
   shipped. Now wired: window keydown handler calls clearSelection
   when Esc fires. Skipped while the confirm dialog is open
   (`pending !== null`) so the dialog's own Esc-cancels takes
   precedence, and skipped during a busy in-flight action so the
   user can't strand a partial-failure mid-flight.

2. focus-visible:ring-zinc-500/70 → focus-visible:ring-accent/50
   on the deselect button. The hardcoded zinc broke the semantic-
   token pattern used by the other action buttons.

Tests: two new vitest cases — Esc clears with selection, Esc no-op
when empty (the bar isn't mounted at count===0 so the listener never
registers). Full suite: 1222/1222.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

canvas/src/components/BatchActionBar.tsx

@@ -30,6 +30,24 @@ export function BatchActionBar() {
     if (count === 0 && hasFailedBatch) setHasFailedBatch(false);
   }, [count, hasFailedBatch]);
 
+  // Esc clears selection — the deselect button title has been promising
+  // "(Escape)" since the bar shipped, but no handler was wired. Skip when
+  // the confirm dialog is open (`pending !== null`) so the dialog's own
+  // Esc-cancels takes precedence and we don't double-handle the keystroke.
+  // Also skip during a busy in-flight action so the user can't accidentally
+  // strand a partial-failure mid-flight.
+  useEffect(() => {
+    if (count === 0 || pending !== null || busy) return;
+    const onKey = (e: KeyboardEvent) => {
+      if (e.key === "Escape") {
+        e.stopPropagation();
+        clearSelection();
+      }
+    };
+    window.addEventListener("keydown", onKey);
+    return () => window.removeEventListener("keydown", onKey);
+  }, [count, pending, busy, clearSelection]);
+
   // Hide when nothing is selected. Hide for single-node selection UNLESS a
   // partial-failure left a survivor awaiting retry.
   if (count === 0) return null;
@@ -129,7 +147,7 @@ export function BatchActionBar() {
         onClick={clearSelection}
         aria-label="Clear selection"
         title="Clear selection (Escape)"
-        className="p-1.5 rounded-lg text-[12px] text-ink-mid hover:text-ink hover:bg-surface-card/50 transition-colors disabled:opacity-50 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-zinc-500/70"
+        className="p-1.5 rounded-lg text-[12px] text-ink-mid hover:text-ink hover:bg-surface-card/50 transition-colors disabled:opacity-50 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent/50"
       >
         ✕
       </button>

canvas/src/components/__tests__/BatchActionBar.test.tsx

@@ -130,6 +130,26 @@ describe("BatchActionBar", () => {
     const toolbar = screen.getByRole("toolbar");
     expect(toolbar.getAttribute("aria-label")).toBe("Batch workspace actions");
   });
+
+  it("Esc clears the selection — matches the deselect button title", () => {
+    // The deselect button has been promising "Clear selection (Escape)"
+    // since the bar shipped, but no handler was wired. This pins the
+    // contract.
+    mockSelectedNodeIds = new Set(["ws-1", "ws-2"]);
+    render(<BatchActionBar />);
+    fireEvent.keyDown(window, { key: "Escape" });
+    expect(mockClearSelection).toHaveBeenCalled();
+  });
+
+  it("Esc is a no-op when nothing is selected", () => {
+    mockSelectedNodeIds = new Set<string>();
+    render(<BatchActionBar />);
+    fireEvent.keyDown(window, { key: "Escape" });
+    // The early-return at count===0 prevents the bar from mounting at all,
+    // so the keydown listener never registers. clearSelection must NOT be
+    // called.
+    expect(mockClearSelection).not.toHaveBeenCalled();
+  });
 });
 
 /**