The DisableDockerUpdateActions setting was being saved to disk but not
updated in h.config, causing the UI toggle to appear to revert on page
refresh since the API returned the stale runtime value.
Related to #1023
- Add pagination (100 items per page) to prevent UI lockup with 2500+ backups
- Show year in date labels for non-current year backups
- Reset to page 1 when filters change
- Add First/Previous/Next/Last navigation controls
Fixes#541
