feat(workspace): unify projects and conversations in one menu

Replace separate project and activity navigation with a fixed-height two-line button and a shared workspace menu. Browse local, remote and channel projects, preview sessions on hover, restore the last opened conversation, and show ten recent conversations alongside active work.

Preserve project settings, recovery actions, draft leave guards and completion reminders. Reuse conversation summaries and windowed lists without hover fetches or polling.

Validation: focused component and App tests, real Electron layout and interaction checks, typecheck and lint passed. The earlier full suite timed out and reported Supervisor settings/layout failures.

Release note: 左上角统一项目与活动入口，支持分类查找、悬停预览和最近 10 个会话；双行按钮整体点击，保留项目设置与跨项目会话切换。

tests/support/overlay-paths-main.ts

@@ -25,10 +25,11 @@ app.whenReady().then(async () => {
   const database = new AssistantDatabase(join(directory, 'assistant.sqlite'))
   database.initialize(directory)
   const project = database.listProjects()[0]!
+  const conversationId = randomUUID()
   const resultId = randomUUID()
   const html = '<html><body><a href="#end">Jump to end</a>' + '<p>Long preview text</p>'.repeat(80) +
     '<h2 id="end">End</h2><script>window.parent.previewUnsafe=true</script><img src="https://example.invalid/leak"></body></html>'
-  database.saveLocalConversations([{ header: { id: randomUUID(), projectId: project.id, title: 'Overlay paths', updatedAt: Date.now() },
+  database.saveLocalConversations([{ header: { id: conversationId, projectId: project.id, title: 'Overlay paths', updatedAt: Date.now() },
     messages: [{ id: randomUUID(), role: 'assistant', state: 'complete', createdAt: Date.now(), content: '```html\n' + html + '\n```',
       attachments: [{ id: randomUUID(), kind: 'text', name: 'review.pdf', size: 20, preview: 'Saved result', resultId }],
       sourceReferences: [{ libraryId: randomUUID(), libraryName: 'Review', documentName: 'Review source', sourceName: 'Fixture',
@@ -155,14 +156,94 @@ app.whenReady().then(async () => {
     await key('Escape')
     await wait('!document.querySelector(".html-preview-viewer")')
     evidence.iframe = true
+    const idleTrigger = await js<number>('document.querySelector(".project-switcher__control").getBoundingClientRect().height')
+    assert.equal(idleTrigger, 60)
+    assert(await js('document.querySelector(".project-switcher__control").matches("button") && document.querySelectorAll(".project-switcher__picker button").length === 1 && !!document.querySelector(".project-switcher__trigger .project-switcher__activity")'))
+    await screenshot('workspace-idle-trigger')
+    database.createTask({ id: randomUUID(), projectId: project.id, conversationId,
+      title: 'Review workspace layout', instructions: 'Layout fixture only', workMode: 'ask', status: 'running' })
+    win.webContents.send(ipcChannels.conversationsChanged)
+    await wait('!!document.querySelector(".project-switcher__control .project-activity__running")')
+    assert.equal(await js('document.querySelector(".project-switcher__control").getBoundingClientRect().height'), idleTrigger)
+    await screenshot('workspace-active-trigger')
+    const workspaceLayouts = []
+    for (const [width, height] of [[1280, 800], [1280, 480], [560, 640]]) {
+      win.setContentSize(width!, height!)
+      await wait(`innerWidth === ${width} && innerHeight === ${height}`)
+      if (width! < 900) {
+        await wait('document.querySelector(".sidebar").inert')
+        await click('.sidebar-toggle')
+        await wait('!document.querySelector(".sidebar").inert')
+      }
+      await js('Promise.all(document.getAnimations().filter(a => a instanceof CSSTransition).map(a => a.finished.catch(() => {})))')
+      for (const theme of ['light', 'dark']) {
+        await js(`document.documentElement.dataset.theme='${theme}'`)
+        await click('.project-switcher__activity')
+        await wait('!!document.querySelector(".workspace-menu")')
+        await js('Promise.all(document.getAnimations().filter(a => a instanceof CSSTransition).map(a => a.finished.catch(() => {})))')
+        const layout = await js<{ bounded: boolean; divider: boolean; compact: boolean; rows: boolean }>(`(() => {
+          const rect = selector => document.querySelector(selector).getBoundingClientRect();
+          const left = rect('.workspace-menu__projects'), input = rect('.workspace-menu__search');
+          const menu = rect('.workspace-menu'), toolbar = rect('.workspace-menu__toolbar');
+          const filters = rect('.workspace-menu__toolbar .segmented-control'), action = rect('.workspace-menu__new');
+          const border = getComputedStyle(document.querySelector('.workspace-menu__projects'));
+          const row = document.querySelector('.workspace-menu [role="menuitemradio"]');
+          const parts = [...row.querySelector('span').children].map(e => e.getBoundingClientRect());
+          return { bounded: input.left >= left.left && input.right <= left.right && menu.left >= 16 && menu.right <= innerWidth - 16 && menu.top >= 16 && menu.bottom <= innerHeight - 16,
+            divider: border.borderRightWidth === '1px' && border.borderRightStyle === 'solid' && border.borderRightColor === getComputedStyle(document.querySelector('.workspace-menu__search')).borderRightColor,
+            compact: toolbar.height < 70 && filters.right <= action.left && Math.abs(filters.top + filters.height / 2 - action.top - action.height / 2) < 2,
+            rows: parts.length >= 3 && parts[0].bottom <= parts[1].top && parts[1].bottom <= parts[2].top };
+        })()`)
+        assert.deepEqual(layout, { bounded: true, divider: true, compact: true, rows: true }, `${width}x${height} ${theme}: ${JSON.stringify(layout)}`)
+        await screenshot(`workspace-${width}x${height}-${theme}`)
+        await key('Escape')
+        await wait('!document.querySelector(".workspace-menu") && document.activeElement.matches(".project-switcher__trigger")')
+        workspaceLayouts.push({ width, height, theme, ...layout })
+      }
+    }
+    evidence.workspaceLayouts = workspaceLayouts
+    evidence.workspaceTriggerHeight = idleTrigger
+    await key('Escape')
     win.setContentSize(760, 700)
     await wait('document.querySelector(".sidebar").inert')
     await click('.sidebar-toggle')
-    await click('.project-switcher .icon-button')
+    await click('.project-switcher__trigger')
+    await wait('!!document.querySelector(".workspace-menu")')
+    assert(await js(`(() => {
+      const menu = document.querySelector('.workspace-menu'), r = menu.getBoundingClientRect();
+      return menu.closest('.floating-portal').parentElement === document.querySelector('.sidebar') &&
+        r.left >= 16 && r.right <= innerWidth - 16 && r.top >= 16 && r.bottom <= innerHeight - 16;
+    })()`))
+    await click('.workspace-menu__categories [role="tab"]:last-child')
+    assert(await js('document.querySelectorAll(".workspace-menu [role=menuitemradio]").length === 0'))
+    await click('.workspace-menu__categories [role="tab"]:first-child')
+    assert(await js(`(() => {
+      const tabs = [...document.querySelectorAll('.workspace-menu__categories [role="tab"]')];
+      return tabs.length === 3 && tabs[0].getAttribute('aria-selected') === 'true' &&
+        tabs.every(tab => tab.getBoundingClientRect().top === tabs[0].getBoundingClientRect().top) &&
+        document.querySelectorAll('.workspace-menu [role="menuitemradio"]').length === 1 &&
+        !document.querySelector('.workspace-menu__scope');
+    })()`))
+    evidence.workspaceCategories = true
+    await js('document.querySelector(".workspace-menu [role=menuitemradio]").focus()')
+    await key('Tab')
+    await wait('document.activeElement.matches(".project-switcher__menu-settings")')
+    await js('Promise.all(document.getAnimations().filter(a => a instanceof CSSTransition).map(a => a.finished.catch(() => {})))')
+    assert.equal(await js('getComputedStyle(document.activeElement).opacity'), '1')
+    await click('.project-switcher__menu-settings')
+    await wait('!!document.querySelector(".project-create-card")')
+    await key('Escape')
+    await wait('!document.querySelector(".project-create-card") && document.activeElement.matches(".project-switcher__trigger")')
+    await click('.project-switcher__trigger')
+    await key('Escape')
+    await wait('!document.querySelector(".workspace-menu") && document.activeElement.matches(".project-switcher__trigger")')
+    assert(await js('!document.querySelector(".sidebar").inert'))
+    await click('.project-switcher__trigger')
+    await click('.workspace-menu__footer button')
     await wait('!!document.querySelector(".project-create-card") && document.querySelector(".app-shell").inert')
     await key('Escape')
     await wait('!document.querySelector(".project-create-card")')
-    assert(await js('!document.querySelector(".sidebar").inert && document.activeElement.matches(".project-switcher .icon-button")'))
+    assert(await js('!document.querySelector(".sidebar").inert && document.activeElement.matches(".project-switcher__trigger")'))
     await key('Escape')
     await wait('document.querySelector(".sidebar").inert')
     evidence.project = true