Replace CategoryExpandedDialog with TransactionBookingDialog that embeds the
JournalEntryForm for full manual booking. Add /api/transactions/[id]/book
endpoint. Add VAT treatment selector to CategoryExpandedDialog. Add booking
buttons to TransactionHistoryList and improve TransactionInboxCard actions.
Fix animation timing in transactions page state updates.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>