Fix note deletion by adding required title field to add-note tool

The add-note tool was missing the title field when creating notes,
causing delete-note and update-note operations to fail since they
identify notes by title.

Changes:
- Added title parameter to add-note tool schema
- Include title field in noteData sent to frontend
- Document that title is used as identifier for updates/deletes

This fixes the issue where notes created via MCP couldn't be
deleted or updated because they had no title property.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: anatoly314

apps/backend/src/mcp/primitives/essential/tools/add-note.tool.ts

@@ -16,6 +16,7 @@ export class AddNoteTool {
     description:
       'Add a sticky note to the diagram for annotations, comments, or documentation. Useful for explaining design decisions.',
     parameters: z.object({
+      title: z.string().describe('Note title (used as identifier for updates/deletes)'),
       content: z.string().describe('Note content/text'),
       x: z.number().optional().describe('X coordinate on canvas (optional, defaults to 100)'),
       y: z.number().optional().describe('Y coordinate on canvas (optional, defaults to 100)'),
@@ -37,6 +38,7 @@ export class AddNoteTool {
       const noteId = nanoid();
       const noteData = {
         id: noteId,
+        title: input.title,
         content: input.content,
         x: input.x ?? 100,
         y: input.y ?? 100,