fix(ui): register the ported explorer models in loadCounts

[QuantumExplorer]

Summary

Follow-up to #832: the new explorer rows read their count badge from the counts dictionary, but loadCounts() was never taught about the ported models — so every new row showed 0 while its drill-in @Query list rendered the real records (QA repro: "Contact Requests 0" on the root list, 4 rows inside).

Registers all fifteen ported models (DashPay family ×7, pending inputs, asset locks, masternodes, shielded ×5) in loadCounts().

Test plan

• Clean dashpay simulator build (arm64); installed on QA-iPhone16
• Explorer root badges match the drill-in list counts (Contact Requests 4, Contact Profiles 1, DashPay Payments 3, Asset Locks 4, shielded rows non-zero)

🤖 Generated with Claude Code

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