fix: executable code block flashing

[rui-typelets]

Summary

This PR upgrades TipTap from v2.26.1 to v3.4.4 and resolves compatibility issues introduced by the major version upgrade.

Key Changes

• TipTap v3 Migration: Updated all TipTap packages to v3.4.4 with proper import syntax fixes
• Import Compatibility: Fixed default imports → named imports for TipTap v3 compatibility
• Extension Configuration: Disabled duplicate link and underline extensions in StarterKit
• CSS Import Order: Moved Google Fonts imports before other CSS imports to resolve PostCSS warnings
• Dependency Updates: Updated React, TypeScript, ESLint and other dev dependencies to latest versions

Technical Details

Breaking Changes Handled

• ✅ Import Syntax: import StarterKit from '@tiptap/starter-kit' → import { StarterKit } from '@tiptap/starter-kit'
• ✅ Extension Conflicts: Added link: false, underline: false to StarterKit config
• ✅ CSS Processing: Reordered @import statements to satisfy PostCSS requirements

Issues Resolved

• ❌ Fixed: [tiptap warn]: Duplicate extension names found: ['link', 'underline']
• ❌ Fixed: The requested module does not provide an export named 'default'
• ❌ Fixed: @import must precede all other statements PostCSS warnings
• ❌ Fixed: Missing manifest.json syntax errors

Testing

• Editor loads without console errors or warnings
• All TipTap extensions function correctly (links, formatting, code blocks, etc.)
• CSS builds without PostCSS warnings
• No duplicate extension conflicts
• Executable code blocks work properly
• Performance remains consistent

Dependencies Updated

Major Upgrades:

• @tiptap/*: 2.26.1 → 3.4.4 (major version upgrade)
• @vitejs/plugin-react: 4.7.0 → 5.0.3
• typescript: 5.8.3 → 5.9.2

Minor/Patch Updates:

• @clerk/clerk-react: 5.41.0 → 5.47.0
• eslint: 9.33.0 → 9.36.0
• lucide-react: 0.523.0 → 0.544.0
• Various @radix-ui and other dependencies

Risk Assessment

Low Risk - All breaking changes have been properly handled:

• Import syntax updated throughout codebase
• Extension conflicts resolved
• Console output clean
• Existing functionality preserved

Verification Steps

1. Run pnpm dev - should start without errors
2. Open editor - should load cleanly without console warnings
3. Test formatting features (bold, italic, links, etc.)
4. Test executable code blocks
5. Verify CSS builds without PostCSS warnings

[github-actions]

🎉 This PR is included in version 1.18.1 🎉

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