• Implemented update method in MessageModel to allow message updates by ID.
• Added deleteAfter method to remove messages in a conversation created after a specified message.
• Introduced new API routes for updating messages and deleting subsequent messages.
• Enhanced frontend components to support message editing and deletion, including a new EditableMessage component for inline editing.
• Updated types to include UpdateMessage schema for message updates.

This enhances the chat functionality by allowing users to modify their messages and manage conversation history more effectively.

Fixes #1282 /claim #1282

[!NOTE] Adds PATCH/DELETE message APIs and integrates inline message editing that can prune subsequent messages and regenerate replies.

• Backend:
  • Message model: add findById, update(id, data), and deleteAfter(conversationId, messageId); use and, gt filters.
  • Routes: add PATCH /api/chat/messages/:id (updates message) and DELETE /api/chat/messages/:id/after (deletes later messages) with org ownership checks; wire schemas SelectMessageSchema, UpdateMessageSchema.
  • Access Control: add route IDs updateChatMessage and deleteChatMessagesAfter.
• Types:
  • Add UpdateMessageSchema and UpdateMessage type; export SelectMessageSchema for responses.
• Frontend:
  • ChatMessages: support editing via new props (conversationId, sendMessage, onMessageEdit); hide messages below while editing; on save, calls update API and optionally deletes later messages then resubmits user message.
  • New component: EditableMessage for inline editing (save/cancel, keyboard shortcuts).
  • Queries: add hooks useUpdateMessage and useDeleteMessagesAfter.
  • Chat page: passes new props and updates local state after edits.

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