Per-camera mini-albums: full-width grid + camera-scoped view navigation

Two fixes to the per-camera pages:

- The camera thumbnail grid is now full-width and reflows with the window like
  the main album. Previously it sat inside the 900px-wide stats column, so wide
  thumbnails only fit ~2 per row. camera.tmpl now puts the grid in a full-width
  sibling block (centered by the body, like the album's direct thumbnail
  children); the heading/back-link stay in the narrow stats column.

- Each camera is now a self-contained mini album. Thumbnails link to per-camera
  view pages (camera-<slug>--<index>.html) whose prev/next cycle only through
  that camera's photos, instead of linking into the shared album view pages
  (where next/prev walked the whole album and left the camera). The view pages
  reuse the album's look (blurred background, EXIF tooltip, animation) and offer
  Gallery / Details (to the album details page) / Direct-link nav. The "--"
  index separator can never collide with a gallery name since slugs never
  contain "--".

Adds cameraview.tmpl + its render field, _stats_render_camera_{gallery,views}
and the cameraview body builders. Tests updated for the new thumbnail links and
extended to assert the per-camera view pages and their camera-scoped navigation;
required-context-vars test now also covers the camera and cameraview templates.

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

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