Replace the generic "🎨 rSpace — Real-time collaborative canvas" fallback
with a full landing page following the rl-* CSS system used by other rApps.
Sections: hero, principles (local-first/interoperable/AI-native/multiplayer),
canvas features, 16-shape library grid, AI capabilities, how it works steps,
ecosystem integrations, open source stack, data protection, and final CTA.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
