Next-level improvements: 15 items across backend, frontend, and testing

Backend:
- SQLiteStateBackend: persistent task/trace storage with SQLite
- InMemoryStateBackend: in-memory impl of StateBackend interface
- Redis cache backend (CacheBackend ABC + MemoryCacheBackend + RedisCacheBackend)
- OpenAI adapter: async acomplete() with retry logic
- Per-tenant + per-IP rate limiting in middleware

Frontend:
- State management: useStore + useAppState (zero-dep, context + reducer)
- React Router integration: URL-based navigation (usePageNavigation)
- WebSocket streaming: sendPrompt + StreamCallbacks for token-by-token updates
- File preview: inline image/text/binary preview with expand/collapse
- Sparkline charts + MetricCard + BarChart for dashboard visualization
- Push notifications hook (useNotifications) with browser Notification API
- i18n system: 6 locales (en, es, fr, de, ja, zh) with interpolation
- 6 new Storybook stories (ChatMessage, Skeleton, Markdown, SearchFilter, Toast, FilePreview)

Testing:
- Playwright E2E config + 6 browser specs (desktop + mobile)
- 18 new Python tests (SQLiteStateBackend, InMemoryStateBackend, cache backends)

570 Python tests + 45 frontend tests = 615 total, 0 ruff errors.

Co-Authored-By: Nakamoto, S <defi@defi-oracle.io>

frontend/e2e/app.spec.ts

@@ -0,0 +1,77 @@
+/**
+ * End-to-end tests for FusionAGI frontend.
+ *
+ * Prerequisites:
+ *   npx playwright install chromium
+ *   npm run dev (or the webServer config will start it)
+ */
+
+import { test, expect } from '@playwright/test'
+
+test.describe('FusionAGI App', () => {
+  test.beforeEach(async ({ page }) => {
+    // Set auth token to skip login
+    await page.addInitScript(() => {
+      localStorage.setItem('fusionagi-token', 'test-e2e-token')
+    })
+  })
+
+  test('renders the main interface', async ({ page }) => {
+    await page.goto('/')
+    await expect(page.locator('.app')).toBeVisible()
+    await expect(page.locator('.logo')).toContainText('FusionAGI')
+  })
+
+  test('navigation tabs work', async ({ page }) => {
+    await page.goto('/')
+    const tabs = page.locator('[role="tab"]')
+    await expect(tabs).toHaveCount(4)
+
+    // Navigate to admin
+    await tabs.filter({ hasText: 'Admin' }).click()
+    await expect(page.locator('.admin-page, [role="status"]')).toBeVisible()
+
+    // Navigate to settings
+    await tabs.filter({ hasText: 'Settings' }).click()
+    await expect(page.locator('.settings-page, [role="form"]')).toBeVisible()
+  })
+
+  test('theme toggle works', async ({ page }) => {
+    await page.goto('/')
+    const app = page.locator('.app')
+    const initialTheme = await app.getAttribute('data-theme')
+
+    await page.click('[aria-label*="mode"]')
+    const newTheme = await app.getAttribute('data-theme')
+    expect(newTheme).not.toBe(initialTheme)
+  })
+
+  test('prompt input accepts text', async ({ page }) => {
+    await page.goto('/')
+    const input = page.locator('[aria-label="Message input"]')
+    await input.fill('Hello FusionAGI')
+    await expect(input).toHaveValue('Hello FusionAGI')
+  })
+
+  test('login page shows when not authenticated', async ({ page }) => {
+    await page.addInitScript(() => {
+      localStorage.removeItem('fusionagi-token')
+    })
+    await page.goto('/')
+    await expect(page.locator('.login-page, input[type="password"], input[type="text"]')).toBeVisible()
+  })
+})
+
+test.describe('Mobile', () => {
+  test.beforeEach(async ({ page }) => {
+    await page.addInitScript(() => {
+      localStorage.setItem('fusionagi-token', 'test-e2e-token')
+    })
+  })
+
+  test('renders on mobile viewport', async ({ page }) => {
+    await page.setViewportSize({ width: 375, height: 812 })
+    await page.goto('/')
+    await expect(page.locator('.app')).toBeVisible()
+  })
+})

frontend/e2e/playwright.config.ts

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+/**
+ * Playwright configuration for FusionAGI E2E tests.
+ *
+ * Run: npx playwright test
+ * Requires: npx playwright install chromium
+ */
+
+import { defineConfig, devices } from '@playwright/test'
+
+export default defineConfig({
+  testDir: '.',
+  timeout: 30000,
+  retries: 1,
+  use: {
+    baseURL: 'http://localhost:5173',
+    trace: 'on-first-retry',
+    screenshot: 'only-on-failure',
+  },
+  projects: [
+    { name: 'chromium', use: { ...devices['Desktop Chrome'] } },
+    { name: 'mobile', use: { ...devices['iPhone 13'] } },
+  ],
+  webServer: {
+    command: 'npm run dev',
+    port: 5173,
+    reuseExistingServer: true,
+  },
+})