Fill the album's short final page with a full-row tile

A short final preview page (e.g. one leftover photo when the photo count
isn't a multiple of the page size) can't be aligned to a multiple of 12
cells, so it left an orphaned bottom-right corner. The album's LAST page
now widens its leftover final single tile into a "fill" tile spanning the
whole row (grid-column: 1 / -1) at any breakpoint, so the bottom edge is
flush; object-fit: cover keeps the wider crop undistorted.

append_preview_grid takes a fill_last flag: render_full_preview_page sets
it only for the page with no "next" link; stats mini-albums pass 'no' so
their small galleries are unaffected. build_tile_block gains a 'fill'
layout and header.tmpl an a.fill-row rule.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/share/templates/default/header.tmpl b/share/templates/default/header.tmpl
index c0a0fac..5d1b2e6 100644
--- a/share/templates/default/header.tmpl
+++ b/share/templates/default/header.tmpl
@@ -247,6 +247,16 @@ cat <<END
             grid-row: span 2;
         }
 
+        /* A "fill-row" tile spans the whole row at ANY column count
+           (grid-column: 1 / -1). Used for the single leftover photo on the
+           album's short final page so the bottom edge stays flush at every
+           breakpoint instead of an orphaned corner; object-fit: cover crops it
+           to the wide banner shape without distortion. */
+        div.thumbs-grid a.fill-row {
+            grid-column: 1 / -1;
+            aspect-ratio: 3 / 1;
+        }
+
         /* A subdivided thumbnail tile fills one grid cell with its own 2x2 inner
            grid packing several smaller thumbnails. Anchor order + the "wide"
            class (a full-width strip spanning both columns) produce the quad /