Stats/camera pages: blurred background, album-like camera thumbs, spacing

Three refinements to the stats site:

- Stats and per-camera pages now get a random blurred background image (same
  seeded pick the album preview pages use) instead of a plain black page. Adds
  _stats_random_background + STATS_BLURS_DIR; falls back to black when no photos
  exist (e.g. isolated unit tests).
- Per-camera thumbnails now behave like the main album: they link to each
  photo's album view page (navigation, details, EXIF tooltip) and carry the same
  seeded animation class, instead of linking to the raw image. render_album_pages
  records a photo -> "<page>-<preview>" map (ALBUM_VIEW_PAGE_BY_PHOTO) that the
  camera pages read; photos with no recorded view page fall back to the image.
- Spacing: the camera leaderboard rows get padding + a separator line so the long
  wrapping camera names are distinguishable, and the stats sections, headings,
  bar rows, back-link, and camera grid get moderate extra spacing so nothing
  looks cramped.

Tests updated for the new camera-thumbnail markup and extended to assert the
stats background and the album view-page links; camera.tmpl comment corrected.

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

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