feat: Step 1 - Project setup & smoke test

Initialize Next.js 16 (App Router) project with all core dependencies:
- Next.js, React 19, TypeScript configuration
- Mantine UI components (@mantine/core, @mantine/hooks)
- ATproto SDK for Bluesky integration
- SurrealDB client (updated to latest non-deprecated version)
- Vercel AI SDK with Google AI provider
- Deepgram SDK for voice-to-text
- React Three Fiber for 3D visualization
- UMAP.js for dimensionality reduction
- Magnitude test framework for E2E testing
- Playwright for browser automation

Created basic app structure with homepage displaying "Ponderants" text.
Configured magnitude.config.ts for testing framework.
Added .example.env with all required environment variables.

Test: Smoke test verifies app boots and renders homepage.
Status: ✓ Test passed (8.4s)

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

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

tests/magnitude/02-theme.mag.ts

@@ -0,0 +1,25 @@
+import { test } from 'magnitude-test';
+
+test('Mantine theme is applied correctly', async (agent) => {
+  // Act: Navigate to the homepage
+  await agent.act('Navigate to the homepage');
+
+  // Check: Verify the Mantine components are rendered
+  await agent.check('The text "Ponderants" is visible as a title');
+  await agent.check('A "Test Button" is visible on the screen');
+
+  // Check: Verify the theme is applied.
+  // We check that the button has the specific visual properties
+  // defined in our theme (gray color, xl radius).
+  await agent.check(
+    'The "Test Button" has a gray background, indicating the theme\'s primaryColor is active'
+  );
+  await agent.check(
+    'The "Test Button" has rounded corners, indicating the theme\'s defaultRadius is active'
+  );
+
+  // Check: Verify the Paper component is rendered with its themed styles
+  await agent.check(
+    'The page content is inside a "Paper" component with a border'
+  );
+});