dropped_payload_paths

Return resolved file paths from a payload that looks like a file drop.

Applies parse_pasted_path_payload — the same parser the chat input's drop handling uses, which only resolves paths that exist on disk — behind a shape guard that requires the drop form terminals actually emit (see looks_like_dropped_payload). Text-only inputs use this to detect a dragged file so it can be rejected instead of inserted as a path.

Leading-path-plus-trailing-text payloads (<path> what is this?) are deliberately out of scope: allow_leading_path stays off, matching the chat input's own drop-time calls, which handle that shape later at submit time instead.