Explicit upload control in the terminal input bar (drag-and-drop doesn't work on mobile at all)

Currently, sharing an image/link/video into a Claude Code terminal session relies on drag-and-drop. Two real problems with that as the only option:

1. Doesn't work on mobile at all — there's no drag-and-drop gesture available, so mobile users have no way to attach images/video to a session.
2. Clunky even on desktop — requires opening the source (browser tab, photo app), finding the file, arranging window space to drag it over, then dropping it precisely onto the input bar.

Request: An explicit upload button/control in the terminal's input bar — tap/click to open a file picker (or camera roll on mobile) — as an alternative to drag-and-drop, not a replacement. Would make image/link/video sharing actually usable on mobile, and faster on desktop.