feat: Improve UI layout and navigation

- Increase logo size (48x48 desktop, 56x56 mobile) for better visibility
- Add logo as favicon
- Add logo to mobile header
- Move user menu to navigation bars (sidebar on desktop, bottom bar on mobile)
- Fix desktop chat layout - container structure prevents voice controls cutoff
- Fix mobile bottom bar - use icon-only ActionIcons instead of truncated text buttons
- Hide Create Node/New Conversation buttons on mobile to save header space
- Make fixed header and voice controls work properly with containers

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

tests/README.md

@@ -0,0 +1,177 @@
+# Ponderants Test Suite
+
+This directory contains all automated and manual tests for the Ponderants application.
+
+## Directory Structure
+
+```
+tests/
+├── magnitude/          # Magnitude.run automated tests
+│   └── node-publishing.mag.ts
+├── helpers/           # Reusable test utilities
+│   ├── playwright-helpers.ts
+│   └── README.md
+└── README.md         # This file
+```
+
+## Test Frameworks
+
+### Magnitude.run
+AI-powered end-to-end testing framework that uses vision to interact with the browser like a human.
+
+**Run tests:**
+```bash
+pnpm test
+# or
+npx magnitude
+```
+
+**Test files:** `*.mag.ts` in the `magnitude/` directory
+
+### Playwright MCP
+Interactive browser automation for manual testing and debugging.
+
+**Usage:** Use the Playwright MCP tools with helper functions from `helpers/playwright-helpers.ts`
+
+## Test Coverage
+
+### Node Publishing Flow (`magnitude/node-publishing.mag.ts`)
+
+**Happy Path Tests:**
+- ✅ User can publish a node from conversation
+- ✅ User can edit node draft before publishing
+- ✅ User can cancel node draft without publishing
+
+**Unhappy Path Tests:**
+- ✅ Cannot publish node without authentication
+- ✅ Cannot publish node with empty title
+- ✅ Cannot publish node with empty content
+- ✅ Shows error notification if publish fails
+- ✅ Handles long content with truncation
+- ✅ Shows warning when cache fails but publish succeeds
+
+**Integration Tests:**
+- ✅ Complete user journey: Login → Converse → Publish → View
+
+## Setup
+
+### 1. Install Dependencies
+```bash
+pnpm install
+```
+
+### 2. Configure Test Environment
+```bash
+cp .env.test.example .env.test
+```
+
+Edit `.env.test` and add your test credentials:
+```env
+TEST_BLUESKY_USERNAME=your-test-user.bsky.social
+TEST_BLUESKY_PASSWORD=your-test-password
+```
+
+**Important:** Use a dedicated test account, not your personal account!
+
+### 3. Start Development Server
+```bash
+pnpm dev
+```
+
+The test server must be running on `http://localhost:3000` before running tests.
+
+### 4. Run Tests
+```bash
+pnpm test
+```
+
+## Writing New Tests
+
+### Using Magnitude
+```typescript
+import { test } from 'magnitude-test';
+
+test('Test description', async (agent) => {
+  await agent.open('http://localhost:3000');
+  await agent.act('Describe the action');
+  await agent.check('Verify the result');
+});
+```
+
+### Using Helpers
+```typescript
+import { test } from 'magnitude-test';
+import { loginWithBluesky, startConversation } from '../helpers/playwright-helpers';
+
+test('Test with helpers', async (agent) => {
+  const page = agent.page;
+
+  await loginWithBluesky(page);
+  await startConversation(page, 'My test message');
+
+  await agent.check('Expected result');
+});
+```
+
+## Best Practices
+
+1. **Test Isolation:** Each test should be independent and not rely on previous tests
+2. **Test Data:** Use dedicated test accounts and test data
+3. **Cleanup:** Clean up any created data after tests (nodes, conversations)
+4. **Error Handling:** Test both happy paths and error scenarios
+5. **Documentation:** Comment complex test logic and edge cases
+6. **Reusability:** Use helper functions for common flows
+7. **Readability:** Use descriptive test names and clear assertions
+
+## Continuous Integration
+
+Tests should run on every pull request:
+
+```yaml
+# .github/workflows/test.yml
+- name: Run tests
+  run: pnpm test
+```
+
+## Debugging Tests
+
+### View Test Execution
+Magnitude.run provides visual feedback during test execution.
+
+### Interactive Testing with Playwright MCP
+Use Playwright MCP tools for step-by-step debugging:
+
+```typescript
+import { loginWithBluesky } from './tests/helpers/playwright-helpers';
+
+// In MCP session
+await loginWithBluesky(page, {
+  username: 'test-user.bsky.social',
+  password: 'test-password'
+});
+```
+
+### Check Server Logs
+Monitor the dev server output for API errors:
+```bash
+pnpm dev
+# Watch for [POST /api/nodes] logs
+```
+
+## Known Issues
+
+1. **OAuth Rate Limiting:** Repeated login tests may hit Bluesky rate limits
+   - Solution: Use fewer login tests or implement session caching
+
+2. **AI Response Times:** Chat tests may timeout on slow responses
+   - Solution: Increase `waitForAIResponse` timeout
+
+3. **Cache Failures:** SurrealDB cache may fail but shouldn't break tests
+   - Expected: Tests should still pass with warning notifications
+
+## Resources
+
+- [Magnitude.run Documentation](https://magnitude.run/docs)
+- [Playwright Documentation](https://playwright.dev)
+- [ATProto OAuth Spec](https://atproto.com/specs/oauth)
+- [Bluesky API Docs](https://docs.bsky.app)