master: 添加会话模块及界面改进

- 新增 ChatView 页面及其逻辑设计
- 修改 App.vue 以支持动态会话标题
- 调整 Sidebar 为固定高度及改进滚动样式
- 优化会话分页，添加 lastPage 逻辑
- 在 SessionSidebar 中实现刷新操作和路由同步
- 更新路由配置，添加 chat 相关路径
- 添加单元测试以覆盖新逻辑

tests/session-sidebar.spec.js

@@ -20,6 +20,7 @@ const makeRouter = () =>
     routes: [
       { path: '/', name: 'login', component: LoginView },
       { path: '/welcome', name: 'welcome', component: LoginView },
+      { path: '/chat/:id', name: 'chat', component: LoginView },
     ],
   })
 
@@ -61,6 +62,7 @@ describe('SessionSidebar', () => {
         total: 1,
         current_page: 1,
         per_page: 20,
+        last_page: 1,
       },
     })
 
@@ -81,6 +83,55 @@ describe('SessionSidebar', () => {
     )
     expect(wrapper.text()).toContain('Demo')
     await wrapper.find('.session-item').trigger('click')
+    await flushPromises()
     expect(localStorage.getItem('ars-current-session')).toBe('s1')
+    expect(router.currentRoute.value.name).toBe('chat')
+  })
+
+  it('resets page when refreshing after loading more', async () => {
+    localStorage.setItem('ars-token', 'jwt-token')
+    mockedAxios.get
+      .mockResolvedValueOnce({
+        data: {
+          data: [{ session_id: 's1', session_name: 'P1', status: 'OPEN' }],
+          meta: { total: 2, current_page: 1, per_page: 10, last_page: 2 },
+        },
+      })
+      .mockResolvedValueOnce({
+        data: {
+          data: [{ session_id: 's2', session_name: 'P2', status: 'OPEN' }],
+          meta: { total: 2, current_page: 2, per_page: 10, last_page: 2 },
+        },
+      })
+      .mockResolvedValueOnce({
+        data: {
+          data: [{ session_id: 's1', session_name: 'Refreshed', status: 'OPEN' }],
+          meta: { total: 1, current_page: 1, per_page: 10, last_page: 1 },
+        },
+      })
+
+    const router = makeRouter()
+    router.push('/welcome')
+    await router.isReady()
+
+    const wrapper = mount(SessionSidebar, {
+      global: {
+        plugins: [router, ElementPlus],
+      },
+    })
+
+    await flushPromises()
+    expect(wrapper.findAll('.session-item')).toHaveLength(1)
+
+    await wrapper.find('.load-more').trigger('click')
+    await flushPromises()
+    expect(mockedAxios.get.mock.calls[1][1].params.page).toBe(2)
+    expect(wrapper.findAll('.session-item')).toHaveLength(2)
+
+    await wrapper.find('[data-testid="refresh-btn"]').trigger('click')
+    await flushPromises()
+    expect(mockedAxios.get.mock.calls[2][1].params.page).toBe(1)
+    expect(wrapper.findAll('.session-item')).toHaveLength(1)
+    expect(wrapper.text()).toContain('Refreshed')
   })
 })