Broadcastify Desktop 0.4.74

Current coverage is checked across followed feeds before historical acquisition. Third and later accounts are protected for today and the previous two days. Rolling caps are 248 for the primary account and 250 for additional accounts, preserving recorded usage and provider throttling. Scheduled analysis yields after one day with remaining dates queued. Windows uses its shared local quota ledger. Offline suite, native UI checks, and package scan passed.