Feature request: Add Webhook Support for File and Block-level Events Integration

[imfangli]

Have you searched existing Github issues to see if someone has already requested this feature?
Yes, I have searched through existing issues and haven't found a similar feature request for webhook integration.

Is your feature request related to a problem? Please describe.
As a developer using Heynote, I often need to integrate my notes and code blocks with other systems and workflows. Currently, there's no automated way to sync or notify external systems when content changes in Heynote. This makes it difficult to:

• Automatically backup specific code blocks
• Integrate with documentation systems
• Sync blocks with RAG (Retrieval-Augmented Generation) systems for AI-powered code assistance and knowledge management

Describe the solution you'd like
I propose adding a webhook system to Heynote that would:

1. Support both file-level and block-level event notifications:
   • File events: created, updated, deleted
   • Block events: created, updated, deleted, language_changed
2. Allow users to configure webhooks with:
   • Custom endpoint URLs
   • Event type selection
   • Custom HTTP headers
   • Retry settings
3. Include rich event payloads:

{
  "event": "block.updated",
  "data": {
    "fileId": "notes/my-note.txt",
    "blockId": "block_1648372891000_x9f4k2m",
    "content": "block content",
    "language": {
      "name": "javascript",
      "auto": true
    },
    "position": 0,
    "timestamp": 1648372892000
  }
}

4. Implement reliability features:

   • Local event queue for offline support
   • Automatic retries for failed deliveries
   • Event persistence across app restarts

5. Provide a simple UI for:

   • Webhook configuration
   • Event delivery monitoring
   • Manual retry of failed events

Describe alternatives you've considered

• File system watchers: Less reliable and doesn't provide block-level granularity
• Export/Import automation: Lacks real-time capabilities

Additional context
Adding webhook support would significantly enhance Heynote's integration capabilities. It would transform Heynote from a standalone note-taking tool into a powerful component that can be seamlessly integrated into various development workflows and systems. This opens up endless possibilities for automation and integration, making Heynote more valuable in modern development ecosystems.

A particularly exciting use case would be integration with RAG systems, allowing developers to build their own AI-powered code assistant based on their personal code snippets and notes. This would enable more contextual and personalized AI assistance while coding.

The key advantage is that users can create their own integration scenarios based on their specific needs, which greatly extends the potential use cases of Heynote.