feat(community): Add Remix + Supabase bookmark manager template

[mioNacs]

Adds a community template demonstrating Remix + Supabase + Tambo integration for AI-powered bookmark management.

This PR supersedes #2012 which supersedes #1980 and addresses all feedback from @michaelmagan:

Changes from #2012

• ✅ Added userToken prop to TamboProvider for proper user authentication
• ✅ Removed Next.js "use client" directive (Remix-specific)
• ✅ Enhanced error handling for missing API keys with helpful setup instructions

What this template demonstrates

• Remix - Full-stack React framework with Vite
• Supabase - PostgreSQL with email/password auth and Row Level Security
• Tambo - Streaming AI chat with generative UI components and voice input

Screenshot

Video Demo

Screen.Recording.2026-02-02.102354.mp4

Tambo Integration

Components (3)

• BookmarkCard - Single bookmark display with favicon
• BookmarkList - Multiple bookmarks in a list with staggered animations
• CategorySummary - Visual category breakdown with animated progress bars

Tools (7)

• add_bookmark, search_bookmarks, update_bookmark, delete_bookmark
• categorize_bookmarks, get_uncategorized_bookmarks, get_category_stats

Setup Notes

⚠️ Supabase Auth Configuration: Users must set JWT Verification to "None" in Tambo dashboard settings (Supabase doesn't support asymmetric JWT verification).

Checklist

• npm run lint passes
• npm run typecheck passes
• npm run build passes
• .env.example included
• tsconfig.json has strict: true
• Voice input with dictation button
• Image attachment option
• User authentication with userToken prop
• README with setup instructions
• Screenshot added
• Video demo linked

[mioNacs]

Important

I opened the PR again because the last one #2065 was closed saying it didn't have a video demo, but I had video demo in both PR and Readme.

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