feat: enable PostHog session replay and fix checkout origin fallback

- Enable session recording in PostHog provider (was disabled by default)
- Add origin URL fallback in checkout route to prevent Stripe "Not a valid URL" error
- Refactor logo component to extract LogoIcon and add color scheme support
- Add .moat/ to gitignore

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/analytics/web/src/providers/posthog/index.tsx

@@ -27,7 +27,7 @@ if (typeof window !== "undefined" && isValidPosthogConfig) {
     person_profiles: "always",
     capture_pageview: false,
     disable_external_dependency_loading: true,
-    disable_session_recording: true,
+    disable_session_recording: false,
   });
 }