v1.7.0

Added

• Enso as a third external quote aggregator alongside Odos and Velora
• All external aggregators (Odos, Velora, Enso) are now available on every supported chain (Mainnet, Base, Arbitrum, BSC). In best mode the zapper queries every enabled provider in parallel (Promise.allSettled) and picks the highest minAmountOut; failures are soft
• Per-chain × per-provider enablement matrix (PROVIDER_ENABLED in src/utils/providers.ts). Flip a boolean to disable a source on a specific chain — it drops out of the dropdown and the best pool automatically
• Provider registry (PROVIDERS in src/utils/providers.ts). Adding a future aggregator is one icon + one registry entry
• New exports: PROVIDERS, PROVIDER_ENABLED, getEnabledProviders, getEnabledAggregators, isProviderEnabled, and types ProviderId, ProviderConfig, QuoteSource

Changed

• QuoteSource type widened from 'best' | 'zap' | 'odos' to 'best' | 'zap' | 'odos' | 'velora' | 'enso' (backward compatible — existing values still valid)
• Unified fetch flow in useZapSwapQuery; the hardcoded zap-vs-odos parallel path is replaced by a generic fetchBestZapQuote that iterates the enabled providers
• Quote Source settings dropdown is now registry-driven and shows only the providers enabled for the current chain
• Demo's Default Quote Source selector now exposes every provider (zap, odos, velora, enso) for testing