Stash v0.3.4-beta.2

Pre-release — UX fix for Move Library visibility

Fixes a confusing flow where "Move library" was hidden until you'd already picked a destination folder. Now the button is visible up front; if no folder is picked, tapping it opens the picker first and then auto-starts the migration once you grant access.

Supersedes v0.3.4-beta. Upgrade to v0.3.4 for the final release.