feat(tui): let Esc cancel active minimal-mode response generation

src/frontends/tui/minimal.test.ts

@@ -29,6 +29,7 @@ function asAgent(value: unknown): NativeAgent {
 function minimalTuiPrivates(value: MinimalTui): {
   handleBackendCommand: (provider: string) => Promise<void>;
   handleModelCommand: (tier: string, providerModel?: string) => void;
+  handleEscapeAction: () => boolean;
   prompt: (text: string) => Promise<string>;
   rl: {
     once: (event: string, cb: () => void) => void;
@@ -37,10 +38,12 @@ function minimalTuiPrivates(value: MinimalTui): {
     write: (data: string | null, key?: { ctrl?: boolean; name?: string }) => void;
   };
   activePromptCancel: (() => void) | null;
+  activeOperationCancel: (() => void) | null;
 } {
   return value as unknown as {
     handleBackendCommand: (provider: string) => Promise<void>;
     handleModelCommand: (tier: string, providerModel?: string) => void;
+    handleEscapeAction: () => boolean;
     prompt: (text: string) => Promise<string>;
     rl: {
       once: (event: string, cb: () => void) => void;
@@ -49,6 +52,7 @@ function minimalTuiPrivates(value: MinimalTui): {
       write: (data: string | null, key?: { ctrl?: boolean; name?: string }) => void;
     };
     activePromptCancel: (() => void) | null;
+    activeOperationCancel: (() => void) | null;
   };
 }
 
@@ -329,4 +333,26 @@ describe('MinimalTui prompt cancellation', () => {
     expect(write).toHaveBeenCalledWith(null, { name: 'return' });
     expect(minimalTuiPrivates(tui).activePromptCancel).toBeNull();
   });
+
+  it('uses Esc to cancel active running operation', () => {
+    const mockSession = {
+      id: 'test',
+      getHistory: () => [],
+      addMessage: vi.fn(),
+      clear: vi.fn(),
+      replaceHistory: vi.fn(),
+    };
+
+    const tui = new MinimalTui({
+      session: asSession(mockSession),
+      modelClient: asRouter({}),
+      systemPrompt: 'test',
+    });
+
+    const cancelRunningOperation = vi.fn();
+    minimalTuiPrivates(tui).activeOperationCancel = cancelRunningOperation;
+
+    expect(minimalTuiPrivates(tui).handleEscapeAction()).toBe(true);
+    expect(cancelRunningOperation).toHaveBeenCalledOnce();
+  });
 });