v0.4.1

Fixed

• Per-plugin updates deactivated active plugins: The single-plugin update endpoint used Plugin_Upgrader::upgrade(), whose core behavior deactivates an active plugin before swapping files and leaves reactivation to the caller — so updating an active plugin from Minn (including Minn itself) stranded it deactivated. Now uses bulk_upgrade() for a single file, the same path core's own AJAX updater uses, which preserves active state — plus a reactivation safety net. "Update all" was never affected.
• Plugin description punctuation: dropped the em dash ("Fast, focused and beautiful. Served at /minn-admin/.").