v2026.07.24.4

What's Changed

Internal

• Batch per-seller "hasn't bought X" probes in mobile library post filtering by @gumclaw in #6206
• Populate errors on every refund failure branch so the dashboard never shows a blank error toast by @gumclaw in #6216
• Lower non-opener resend count preview budget from 10s to 300ms by @gumclaw in #6221

Full Changelog: v2026.07.24.3...v2026.07.24.4