Cap the 2x2 feature tiles at two per page

Each tile rolled for a feature independently, so a page (or stats
gallery) could fill up with large 2x2 hero tiles. append_preview_grid
now counts the features it has placed and stops offering the "feature"
layout to tile_layout_for once two have been used, so any single grid
gets at most two feature tiles; later tiles fall back to subdivided or
single. The cap is per append_preview_grid call, so it applies to both
the main preview pages and the stats mini-album galleries.

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

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