A native select draws its option list itself, so hovering a name gave
nothing to go on: you picked by filename alone. Load Image + Pad, Load
Video and the crop / rotate / pad editors now open a list that shows the
hovered picture, or plays the hovered clip muted with its size and
length, and filters as you type; arrow keys, Enter and Escape work.
The picker (js/shared/media_picker.mjs) only reads the combo widget's
options and writes the chosen value back, so saved workflows, undo and
the API are unchanged. Pure parts live in media_list.mjs with tests.
ausboss
153eb3a25d