v.0.5.0: Add field text alignment, loop max-items cap, and whole-item linking

- Custom Field block: enable typography.textAlign so the editor exposes a
  left/center/right control; ship a small style so alignment also takes
  effect when the field renders as an inline tag (span/strong/em).
- Loop query: add a "Max items (total)" option that caps the total number
  of items shown across pagination (shrinks the final page and limits the
  page count for numbered pagination and load-more).
- Loop layout: add a "Link entire item to post" toggle that makes each item
  clickable via a stretched-link overlay, keeping inner links/buttons usable.
- Silence two long-standing PHPCS warnings (direct DB query in the fields
  endpoint; a comment misread as commented-out code).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>