Reuse the album tile grid for stats mini-album galleries (DRY)

The per-camera and per-filter stats mini-album galleries rendered their
own plain img.thumb grid, so they did not get the dynamic tiles. Make
them reuse the album's shared grid builder instead.

Generalize append_preview_grid (and build_tile_block /
build_subdivided_tile / build_preview_thumbnail) to take an href_prefix
rather than a page number: the main album passes "<page_num>-" (view
pages "<page>-<n>.html") and the stats mini-albums pass "" (view pages
bare "<n>.html") -- the only difference between the two grids. The
duplicate _stats_filter_thumbnail is removed; _stats_build_filter_thumbs
now calls append_preview_grid, and camera.tmpl wraps the result in the
same thumbs-grid container. Stats galleries now get the identical 2x2
feature tiles, subdivided sub-thumbnails, entry animations and hover
effects as the main overview.

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

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