Library items' Post objects were constructed without width/height
(library_meta doesn't store them), so the popout got 0/0 and
_fit_to_content returned early without setting keep_aspect_ratio.
Videos were unaffected because mpv reports dimensions later via
VideoSizeKnown. Images had no second chance — the aspect lock
was never set, and manual window resizing stretched them freely.
Fix: new _image_dimensions(path) reads the actual pixel size from
the file via QPixmap before constructing the Post. The Post now
carries real width/height. _update_fullscreen moved to run AFTER
Post construction so cp.width/cp.height are populated when the
popout reads them for pre-fit + aspect lock.
Not a regression from the templates refactor — pre-existing gap
in the library display path.
pax
82e7c77251