Add polished OAuth success page

[salmonumbrella]

Summary

• Adds a proposed replacement for the roamjs.com/oauth?auth=true redirect page that users see after authorizing their Google account
• Currently the page is bare — this adds a polished success screen with the RoamJS logo, a "Google Account Connected to Roam Research" heading, and a subtle blinking cursor animation on the "Roam" badge
• Includes the OAuth relay JavaScript (postMessage for browser popup flow, session POST for desktop app flow) so it's a functional drop-in replacement

Details

The HTML file at static/oauth-success.html is self-contained and ready to be hosted at roamjs.com/oauth. It handles:

1. Browser flow: Relays the authorization code and state back to the Roam window via postMessage
2. Desktop flow: Decodes the session from state and POSTs to /oauth/session for the extension to poll
3. Error display: Shows a message if Google returns an error

pr-for-the-droid.mp4

Preview

The page features:

• Centered RoamJS logo with a checkmark badge
• Fade-in animation on load
• Monospace "Roam" badge with a blinking cursor and hand-drawn underlines

Test plan

• Open static/oauth-success.html locally to verify the visual design
• Verify the postMessage relay works by testing the full OAuth flow with this page hosted at the redirect URI
• Test desktop app flow (session polling path)

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[salmonumbrella]

Hey @mdroidian — this is a proposed upgrade for the roamjs.com/oauth?auth=true redirect page. Right now it's pretty bare after Google auth completes. This adds a polished success screen with the RoamJS logo, a blinking cursor animation, and clear messaging. The HTML is self-contained with the OAuth relay JS included, so it should be a drop-in replacement. Let me know what you think!