IndexedDB cleanup Policy

[Pejjp]

En ce moment les fichiers raws sont gardés indéfiniments en mémoire du browser.

À implémenter:

• Remove temporary orphaned blobs immediately when no hotspot references them.
• Delete abandoned unpinned drafts after something like 7 to 30 days.
• Keep recently opened or explicitly saved/pinned projects indefinitely.
• Warn before deleting anything user-facing if the app presents it as a “project”.
• Provide a clear user action like Delete local project or Clear local cache.
• Clear the db on tab close.
• Before closing the tab, warn the user that the data will be lost and propose to save.