fix EXIF-rotated images shown cropped in previews, closes #4482

JPEGs with EXIF orientation 5/6/7/8 were rendered cropped in the
mediamanager detail view, the image diff view and the fullscreen
deta

fix EXIF-rotated images shown cropped in previews, closes #4482

JPEGs with EXIF orientation 5/6/7/8 were rendered cropped in the
mediamanager detail view, the image diff view and the fullscreen
detail page: getimagesize() / JpegMeta report raw (rotation-unaware)
pixel dimensions, and passing both w and h to fetch.php defaults to
center-crop.

- Bump splitbrain/slika to 1.1, which ships ImageInfo: a rotation-
aware, metadata-only dimension simulator mirroring Adapter's
fluent API (autorotate/resize/crop).
- Add fit=1 to fetch.php: when both w and h are given, route to
media_resize_image() (bbox fit) instead of media_crop_image().
Token hashes only (id, w, h) so existing tokens stay valid.
- Add MediaFile::getDisplayDimensions($w, $h, $crop) which delegates
to ImageInfo and returns the dims fetch.php would produce.
- Add Display::getDetailHtml() and retire media_preview() / the old
media_image_preview_size() helper. media_tab_view and MediaDiff
now share the Display-based renderer.
- Rewrite tpl_img() (lib/tpl/*/detail.php) to use MediaFile dims +
fit=1 URL; drops the manual ratio math.
- Tests: MediaFileTest covers the dims math, DisplayTest covers the
detail-view HTML (rotated dims, rev-vs-timestamp URL selection,
structure), fetch_imagetoken gains a fit-token compat test.
Fixture _test/data/media/wiki/exif-orient-6.jpg: 20x30 JPEG with
EXIF orientation 6.

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