Split album-render.source.sh along its four seams (ar0)

album-render.source.sh bundled four concerns that change for unrelated
reasons. Extract three focused siblings, leaving album-render as the page
orchestrator:

  - album-tile-layout.source.sh    tile_layout_for, build_tile_block,
                                   build_subdivided_tile
  - album-thumbnail-html.source.sh build_preview_thumbnail,
                                   append_preview_grid
  - album-photo-select.source.sh   album_photo_files, album_page_records,
                                   splash_photo_files, random_splash_photo,
                                   randomphoto

album-render.source.sh keeps page assembly, the per-photo view/details
pages, navigation redirects, index/splash, and the job_pool_* plumbing.
Every function moved whole with no body/signature change. The
album_view_page_for_photo accessor and its private ALBUM_VIEW_PAGE_BY_PHOTO
map stay in album-render so the stats mini-album boundary is unchanged.
LIB_SOURCES (Justfile + src/shuriken.sh) sources the three new modules
before album-render. Regenerated bin/shuriken.

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

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