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>

app/globals.css

@@ -0,0 +1,8 @@
+@import '@mantine/core/styles.css';
+
+body {
+  margin: 0;
+  padding: 0;
+  background-color: #181a1d; /* Our darkest gray */
+  color: #e9ecef; /* Our lightest gray */
+}