0.4.4

Bug-fix release (changes from PR #22).

Updater

• Rollback now restores nested files recursively and writes via writeBinary (no delete-then-copy gap).
• Recursive directory creation (ensureDir) fixes writes into not-yet-existing nested folders.
• removeBackups now targets the correct backup dir (.update_backup).

Stability / leaks

• Fix Web Worker leak (verification worker registered as a child).
• proxyService initialized eagerly so institution search works before pro features unlock.
• Vault delete/rename listeners are now cleaned up.
• One-shot DataManager queries no longer accumulate data sources.
• Metadata/delete/rename listeners now register on the live DataService instance.

Correctness

• Template $-escape: values containing $&/$1 are inserted literally.
• Remove duplicate setting-tab patch and duplicate command registration.