## Task 5: shadcn/ui-Inspired Visual System In CSS

**Files:**
- Modify: `apps/web/src/index.css`
- Test: `apps/web/src/features/workbench/ProjectWorkbench.test.ts`

**Interfaces:**
- Consumes: class names introduced in Tasks 1-4.
- Produces: stable desktop layout, responsive mobile layout, accessible focus states.

- [ ] **Step 1: Add a test assertion for active state semantics**

Extend `ProjectWorkbench.test.ts` with:

```ts
it('marks active channel with aria-pressed', async () => {
  render(ProjectWorkbench, { props: { currentUser: { account: 'david@example.com' } } });

  await fireEvent.click(screen.getByRole('button', { name: 'Work Plan 8' }));

  expect(screen.getByRole('button', { name: 'Work Plan 8' })).toHaveAttribute('aria-pressed', 'true');
});
```

- [ ] **Step 2: Run test**

Run:

```powershell
Set-Location D:\work\senlinai\agent\apps\web
npm test -- --run src/features/workbench/ProjectWorkbench.test.ts
```

Expected: PASS before visual CSS work; this protects state semantics while styling changes.

- [ ] **Step 3: Replace `index.css` with workbench visual system**

Implement CSS tokens and component classes:

```css
:root {
  color: #18181b;
  background: #f4f4f5;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
  --background: #f4f4f5;
  --panel: #ffffff;
  --panel-muted: #fafafa;
  --border: #d4d4d8;
  --text: #18181b;
  --muted: #71717a;
  --primary: #0f7ae5;
  --primary-strong: #0969c8;
  --success: #15803d;
  --danger: #b91c1c;
  --radius: 8px;
}

* { box-sizing: border-box; }
body { margin: 0; min-width: 320px; min-height: 100vh; }
button, input, textarea, select { font: inherit; }
button { cursor: pointer; }
button:focus-visible, input:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

.login-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background: var(--background);
}

.login-panel {
  width: min(420px, 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 24px;
}

.server-login,
.login-heading,
.channel-page,
.object-inspector,
.channel-sidebar {
  display: grid;
  gap: 12px;
}

.server-login input,
.search-box input {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 9px 10px;
  background: white;
}

.server-login button,
.primary-action {
  border: 1px solid var(--primary);
  border-radius: 6px;
  background: var(--primary);
  color: white;
  padding: 9px 12px;
}

.workbench-shell {
  min-height: 100vh;
  display: grid;
  grid-template-rows: 64px 1fr;
}

.workspace-topbar {
  display: grid;
  grid-template-columns: 160px minmax(240px, 1fr) auto;
  align-items: center;
  gap: 16px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
  padding: 0 16px;
}

.workbench-body {
  min-height: 0;
  display: grid;
  grid-template-columns: 76px 280px minmax(0, 1fr) 320px;
}

.project-rail,
.channel-sidebar,
.object-inspector {
  border-right: 1px solid var(--border);
  background: var(--panel);
}

.project-rail {
  display: grid;
  align-content: start;
  gap: 10px;
  padding: 12px;
}

.project-rail button {
  min-width: 48px;
  min-height: 48px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--panel-muted);
}

.project-rail button.active,
.channel-group button.active {
  border-color: var(--primary);
  color: var(--primary);
  background: #eff6ff;
}

.channel-sidebar,
.object-inspector,
.channel-stage {
  padding: 16px;
  overflow: auto;
}

.channel-group,
.recent-sessions,
.task-list,
.record-list {
  display: grid;
  gap: 8px;
}

.channel-group button,
.recent-sessions button,
.task-card,
.record-row,
.cron-row {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 10px 12px;
}

.task-card,
.record-row,
.cron-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 12px;
  align-items: start;
}

.task-card.completed {
  color: var(--muted);
  background: var(--panel-muted);
}

.inspector-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
}

.inspector-tabs button[aria-selected='true'] {
  border-color: var(--primary);
  color: var(--primary);
}

@media (max-width: 920px) {
  .workspace-topbar {
    grid-template-columns: 1fr;
    height: auto;
    padding: 12px;
  }

  .workbench-shell {
    grid-template-rows: auto 1fr;
  }

  .workbench-body {
    grid-template-columns: 1fr;
  }

  .project-rail,
  .channel-sidebar,
  .object-inspector {
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }
}
```

- [ ] **Step 4: Run component tests and build**

Run:

```powershell
Set-Location D:\work\senlinai\agent\apps\web
npm test -- --run
npm run build
```

Expected: both PASS.

- [ ] **Step 5: Commit**

Run:

```powershell
Set-Location D:\work\senlinai\agent
git add apps\web\src\index.css apps\web\src\features\workbench\ProjectWorkbench.test.ts
git commit -m "style: apply workbench visual system"
```

---