fix(coinbase): Fix Coinbase metadata wallet context

[llbartekll]

Summary

• capture the Dash receive address and wallet ID atomically, then carry that wallet context through the Coinbase send response
• retain fallback Coinbase transfers for their originating wallet across runtime rebuilds without fetching a full snapshot while tracking
• throttle metadata refreshes triggered by Core Data saves and correct the migration ledger left stale by Remove DashSync Coinbase transaction metadata tail #902

Follow-up to #902. The public transferFromCoinbaseToDashWallet API and direct network.hash behavior remain unchanged.

Validation

• git diff --check
• plutil -lint DashWallet.xcodeproj/project.pbxproj
• dashpay Debug build for arm64 iOS Simulator
• Focused CoinbaseTransactionMetadataTests and the dashwallet build are blocked before app compilation by the local watchOS runtime mismatch: runtime 23S303 is unavailable for watch simulator SDK 23T570.

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