feat: Add tag expansion and command completion system

[weinaike]

This commit introduces a comprehensive tag expansion and command completion system across the application, enabling users to use shorthand tag commands (e.g., /tag_name arguments) that automatically expand to their full content.

Core Features:

1. Tag Command Expansion Library (tagExpansion.ts)

   • Parse /tag_name syntax with optional arguments
   • Expand tag commands by replacing placeholders (, {args}, {{args}})
   • Support multiple commands in the same text
   • Handle Markdown escape characters properly

2. Multi-Source Autocomplete (multi-file-search-textarea.tsx)

   • Added unified search for both tags and files
   • Support @ and / triggers for tag/command completion
   • Visual separation between tags and files in dropdown
   • Smart insertion logic based on trigger character

3. WYSIWYG Editor Integration (file-tag-typeahead-plugin.tsx)

   • Extended typeahead to support both @ and / triggers
   • Different behavior based on trigger:
     • @tag_name: inserts full tag content
     • /tag_name: inserts command syntax for expansion
   • Improved text node replacement logic

4. Task Form Integration (TaskFormDialog.tsx)

   • Automatically expand tag commands before task creation/update
   • Seamless integration with existing form submission flow
   • Error handling for expansion failures

5. Follow-up Message Integration (TaskFollowUpSection.tsx, useFollowUpSend.ts)

   • Enable tag expansion for follow-up messages
   • Support tag commands in queued messages
   • Configurable expansion via expandTags flag

Technical Implementation:

• Command parsing supports multiple /commands in the same text
• Position-aware replacement (processes from end to start)
• Graceful fallback if expansion fails
• Unified search utility (searchTagsAndFiles) for consistent UX
• Async expansion to support future enhancements

User Benefits:

• Faster task creation with reusable templates
• Consistent messaging with predefined tag content
• Flexible argument passing for dynamic content
• Intuitive autocomplete across the application

[vibe-kanban-cloud]

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