Clipboard utilities.
Get the glyph set for the current charset mode.
Copy text to the system clipboard.
Copy text to the clipboard and surface the outcome as a toast.
Centralizes the copy-then-notify pattern shared by the Ctrl+C and
[ COPY ] paths so the success/failure messaging stays consistent.
Copy selected text from app widgets to clipboard.
This queries all widgets for their text_selection and copies any selected text to the system clipboard.