fix(opencode): switch session models without restart

tests/unit/use-chat-commands.test.tsx

@@ -50,6 +50,7 @@ function renderCommandHook(
   const actions = {
     rename: vi.fn<ChatCommandActions['rename']>().mockResolvedValue(undefined),
     timeline: vi.fn<ChatCommandActions['timeline']>(),
+    models: vi.fn<ChatCommandActions['models']>(),
     compact: vi.fn<ChatCommandActions['compact']>().mockResolvedValue(undefined),
     share: vi.fn<ChatCommandActions['share']>().mockImplementation(async () => {
       context.shared = true;
@@ -138,6 +139,17 @@ function renderCommandHook(
 }
 
 describe('useChatCommands', () => {
+  it('opens the shared model selector for both /models and /model', async () => {
+    const fixture = renderCommandHook('/models');
+
+    await act(async () => fixture.result.current.tryExecuteDraft());
+    expect(fixture.actions.models).toHaveBeenCalledOnce();
+    expect(fixture.getDraft()).toBe('');
+
+    await fixture.run('/model');
+    expect(fixture.actions.models).toHaveBeenCalledTimes(2);
+  });
+
   it('fills a palette selection and executes it only on the next Enter', async () => {
     const fixture = renderCommandHook('/comp');
     act(() => fixture.result.current.handleKeyDown(keyEvent('Enter')));