feat(gui): Enhance Deleting Edges

[seongjinyoon]

Feature:

• Deletion of selected links with keyboard
• Right click on link to get drop down menu
• Delete combination of operators, comment boxes, and links together
• Modified Drop down menu for comment box as it included "run to this operator" despite not being an operator.

Closes #3579
Closes #3074

Screen.Recording.2025-08-06.at.1.47.40.PM.mov

[Copilot]

Pull Request Overview

This PR enhances the deletion functionality for workflow editor links, adding support for keyboard deletion of selected links, right-click context menus for links, and unified deletion of operators, comment boxes, and links together.

• Added right-click context menu support for links with highlighting functionality
• Enhanced deletion logic to handle operators, comment boxes, and links in a single bundled action for proper undo/redo support
• Modified context menu display logic to show appropriate options when links are selected

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
workflow-editor.component.ts	Added link right-click event handling and enhanced deleteElements method to support unified deletion of all element types
context-menu.component.ts	Added hasHighlightedLinks method and updated onDelete to handle combined deletion of operators, comment boxes, and links
context-menu.component.html	Modified context menu visibility conditions to show appropriate options when links are highlighted

[Ma77Ball]

Using right-click to select and delete links is a helpful improvement over the original delete functionality, especially for quickly removing multiple links. However, since using right-click as a select for the delete action isn't a common pattern, it might be confusing for some users. It might be worth merging both our branches (#3602). This would allow us to keep the dedicated delete button on each link for clarity, while also supporting the right-click shortcut for more advanced users who want to delete multiple links quickly.

[aglinxinyuan]

LGTM!

[aglinxinyuan]

Please fix the frontend test.