Feature Request: Add right-click context menu for selected text

When a user selects text with the cursor, right-clicking on the selection should display a context menu that includes the following standard editing options:

Cut

Copy

Paste

Select All

Find (search for the selected text)

This enhancement would make text editing more convenient and align the tool with common user expectations for text editors.

Start by tracing the editor's selected-text and right-click input handling; the issue names no files or tests. Define done as showing a context menu for selected text with Cut, Copy, Paste, Select All, and Find, with each option working as described.

Written by the indexing model from the issue text.