[BUG] MCQ text handling and cursor behavior issues

[matKlju]

Bug description:

MCQ configuration has multiple text/input UI issues:

• MCQ button config tags have no max width and long button text is not cropped.

• Editing MCQ button text resets the cursor position to the end of the line.
  • While editing MCQ, typing in the client message area also resets the cursor position to the end.

Screen.Recording.2026-05-08.102746.mp4

Expected behavior:

• MCQ button tags should have a max width and crop overflowing text.

  • Max length of the button tag should extend only up to the edit button.
  • Cropped text should end with "...".
  • This should not affect the canvas button tag; it must remain as-is.

• Cursor position should remain where the user is editing or typing and must not jump to another position.

  • Opened button config should not affect any other functionality while open.