feat(KB-180): rename pause button titles from 'AI engine' to 'scheduling'

- Update Header pause button titles to 'Pause scheduling' / 'Resume scheduling'
- Update Header unit tests to assert new title strings
- Update App integration tests for engine pause flows to use new titles

packages/dashboard/app/components/Header.tsx

@@ -27,7 +27,7 @@ export function Header({
         <button
           className={`btn-icon${enginePaused ? " btn-icon--paused" : ""}`}
           onClick={onToggleEnginePause}
-          title={enginePaused ? "Resume AI engine" : "Pause AI engine"}
+          title={enginePaused ? "Resume scheduling" : "Pause scheduling"}
           disabled={!!globalPaused}
         >
           {enginePaused ? <Play size={16} /> : <Pause size={16} />}

packages/dashboard/app/components/__tests__/App.test.tsx

@@ -218,9 +218,9 @@ describe("App engine pause (soft pause)", () => {
 
     render(<App />);
 
-    // When engine is paused, the pause button should show "Resume AI engine"
+    // When engine is paused, the pause button should show "Resume scheduling"
     await waitFor(() => {
-      expect(screen.getByTitle("Resume AI engine")).toBeTruthy();
+      expect(screen.getByTitle("Resume scheduling")).toBeTruthy();
     });
   });
 
@@ -233,7 +233,7 @@ describe("App engine pause (soft pause)", () => {
     render(<App />);
 
     await waitFor(() => {
-      expect(screen.getByTitle("Pause AI engine")).toBeTruthy();
+      expect(screen.getByTitle("Pause scheduling")).toBeTruthy();
     });
   });
 
@@ -246,15 +246,15 @@ describe("App engine pause (soft pause)", () => {
     render(<App />);
 
     await waitFor(() => {
-      expect(screen.getByTitle("Pause AI engine")).toBeTruthy();
+      expect(screen.getByTitle("Pause scheduling")).toBeTruthy();
     });
 
     // Click the pause button
-    fireEvent.click(screen.getByTitle("Pause AI engine"));
+    fireEvent.click(screen.getByTitle("Pause scheduling"));
 
     // Should optimistically switch to "Resume" state
     await waitFor(() => {
-      expect(screen.getByTitle("Resume AI engine")).toBeTruthy();
+      expect(screen.getByTitle("Resume scheduling")).toBeTruthy();
     });
 
     // Should call updateSettings with enginePaused: true

packages/dashboard/app/components/__tests__/Header.test.tsx

@@ -28,47 +28,47 @@ describe("Header", () => {
 
   // ── Pause button (soft pause) ────────────────────────────────────
 
-  it("renders pause button with 'Pause AI engine' title when not paused", () => {
+  it("renders pause button with 'Pause scheduling' title when not paused", () => {
     render(<Header enginePaused={false} />);
-    const btn = screen.getByTitle("Pause AI engine");
+    const btn = screen.getByTitle("Pause scheduling");
     expect(btn).toBeDefined();
   });
 
-  it("renders play button with 'Resume AI engine' title when engine is paused", () => {
+  it("renders play button with 'Resume scheduling' title when engine is paused", () => {
     render(<Header enginePaused={true} />);
-    const btn = screen.getByTitle("Resume AI engine");
+    const btn = screen.getByTitle("Resume scheduling");
     expect(btn).toBeDefined();
   });
 
   it("calls onToggleEnginePause when pause button is clicked", () => {
     const onToggle = vi.fn();
     render(<Header enginePaused={false} onToggleEnginePause={onToggle} />);
-    const btn = screen.getByTitle("Pause AI engine");
+    const btn = screen.getByTitle("Pause scheduling");
     fireEvent.click(btn);
     expect(onToggle).toHaveBeenCalledOnce();
   });
 
   it("applies btn-icon--paused class when engine is paused", () => {
     render(<Header enginePaused={true} />);
-    const btn = screen.getByTitle("Resume AI engine");
+    const btn = screen.getByTitle("Resume scheduling");
     expect(btn.className).toContain("btn-icon--paused");
   });
 
   it("does not apply btn-icon--paused class when engine is not paused", () => {
     render(<Header enginePaused={false} />);
-    const btn = screen.getByTitle("Pause AI engine");
+    const btn = screen.getByTitle("Pause scheduling");
     expect(btn.className).not.toContain("btn-icon--paused");
   });
 
   it("pause button is disabled when globalPaused is true", () => {
     render(<Header globalPaused={true} enginePaused={false} />);
-    const btn = screen.getByTitle("Pause AI engine");
+    const btn = screen.getByTitle("Pause scheduling");
     expect((btn as HTMLButtonElement).disabled).toBe(true);
   });
 
   it("pause button is enabled when globalPaused is false", () => {
     render(<Header globalPaused={false} enginePaused={false} />);
-    const btn = screen.getByTitle("Pause AI engine");
+    const btn = screen.getByTitle("Pause scheduling");
     expect((btn as HTMLButtonElement).disabled).toBe(false);
   });