Improve Filament Import UX with Persistent Error CSV Downloads

Short summary

FilamentPHP's import action restricts error CSV downloads to the initiating user and loses access once notifications are dismissed. This tutorial implements a complete team-based import management solution using Laravel's Policy system, exposing all imports with download and delete controls via proper authorization gates. The implementation leverages Filament's internal Import model and signed routes while adapting authorization through a custom Policy class.

• •FilamentPHP imports lack persistent error tracking and team-wide access by default
• •Implement a Laravel Policy to control authorization and expose imports in a Filament resource
• •Use signed routes to safely download error CSVs with role-based permission checks

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