fix(maestro): reset pending state when kill dialog transitions to force mode

The onConfirm handler in Sidebar resolves (not rejects) when the daemon
refuses an unforced kill — it mutates state to switch to force mode and
returns. That left `pending` stuck at true in the KillDialog, so the
"Force kill" button rendered disabled.

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

web/src/components/dialogs/KillDialog.test.tsx

@@ -71,4 +71,33 @@ describe("KillDialog", () => {
     await waitFor(() => expect(kill.disabled).toBe(false));
     expect(screen.getByText("Failed to kill: daemon unreachable")).not.toBeNull();
   });
+
+  it("resets pending when force changes, so the force button is clickable", async () => {
+    // Simulate the Sidebar flow: onConfirm resolves (parent switches to
+    // force mode via rerender), but pending was set to true before the call.
+    const onConfirm = vi.fn(() => Promise.resolve());
+    const { rerender } = render(
+      <KillDialog name="alpha" blockers={null} onConfirm={onConfirm} onCancel={vi.fn()} />,
+    );
+
+    const kill = screen.getByRole("button", { name: "Kill" }) as HTMLButtonElement;
+    fireEvent.click(kill);
+    expect(kill.disabled).toBe(true);
+
+    // Parent re-renders with force=true (the daemon refused the unforced kill).
+    await waitFor(() => expect(onConfirm).toHaveBeenCalledOnce());
+    rerender(
+      <KillDialog
+        name="alpha"
+        blockers={{ uncommitted_files: 1, untracked_files: 0, unpushed_commits: 0 }}
+        force
+        reason="worktree is dirty"
+        onConfirm={onConfirm}
+        onCancel={vi.fn()}
+      />,
+    );
+
+    const forceBtn = screen.getByRole("button", { name: "Force kill" }) as HTMLButtonElement;
+    expect(forceBtn.disabled).toBe(false);
+  });
 });

web/src/components/dialogs/KillDialog.tsx

@@ -34,6 +34,11 @@ export function KillDialog(props: KillDialogProps) {
   // asked for the kill, so Enter confirms it.
   useEffect(() => confirmRef.current?.focus(), []);
 
+  // When the dialog transitions from normal → force mode, the previous
+  // onConfirm resolved without error (it mutated parent state and returned),
+  // so `pending` is still true.  Reset it so the force button is clickable.
+  useEffect(() => setPending(false), [force]);
+
   const handleConfirm = () => {
     setPending(true);
     setError(null);