fix(gallery): hand the export over selected instead of faking a copy

The button said "copied" and nothing reached the clipboard. From a file:// origin Chrome refuses both programmatic paths: navigator.clipboard.writeText rejects NotAllowedError, and execCommand('copy') returns true while writing nothing. The truthy return is what let the page claim a success it never had.

A hand-typed Ctrl+C works, so nothing about the clipboard is broken. I checked the rest of the chain: a Wayland-set clipboard crosses to X11, and Emacs reads it back correctly against a sentinel. So the page's only job is to hand the text over selected, and the reader's own copy does the rest.

The comment I shipped earlier had this backwards, claiming Chrome couldn't write the clipboard at all. It's replaced.

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