Slash command picker improvements in the CoAudit Office Add-in

Command picker displays in the right place in the Excel and Word Add-ins — the slash command menu was appearing at an incorrect position when used inside the add-in panel. It now anchors reliably to the correct spot on screen regardless of the surrounding layout.
Clearer dismiss behavior for the command picker — pressing Escape now permanently closes the picker until you type / again. Clicking outside or switching focus temporarily hides it; your next keystroke in the same search brings it back automatically, matching how it works on the main web app.
Slash command suggestion menus close cleanly — menus that appeared after typing / now dismiss properly when no longer needed, and outdated suggestions no longer linger in the composer footer.