v2.5.1

Added

• Test connection in backup target dialogs. New and edit dialogs for all six target types
  (local folder, host folder, S3, SFTP, SMB, NFS) have an optional "Test connection" button that
  checks the unsaved settings before you save. The test writes a uniquely named object, reads it
  back, compares it and removes it again; it never creates folders, never overwrites existing
  files, and reports a failed clean-up instead of claiming success. Nothing is saved, pinned or
  recorded by a test. A stored secret is only reused for the same target and destination; if you
  change the destination, enter the secret again. The result is cleared when a field changes. In
  the demo the test is simulated without network access.
• "With backups" filter. The backup overview has a new segment after "All" that lists only
  hosts and resources that have at least one complete backup set (English, German, Spanish). The
  counts follow the selected host and search.

Changed

• The connection test of saved targets uses the same safer probe (exclusive test object, clean-up
  reporting, translated error messages).

Fixed

• Backup list: icons, names and the metadata line no longer touch the row borders; rows keep
  even vertical spacing and centred actions.