### What problem does this PR solve?

Feat: Adjust the style of the note node #3221

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

Feat: Delete the operator node and hide the corresponding sheet #3221
### Type of change


- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

Feat: Modify the background color of the agent canvas #3221
### Type of change


- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

Feat: Adjust the style of the agent canvas connection line #3221

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

Feat: Add note node #3221

### Type of change


- [x] New Feature (non-breaking change which adds functionality)