fix(ui): Platform Sync Clear actually forces a full trunk/branch resync

[QuantumExplorer]

Problem

On the Platform Sync Status screen, Clear + Sync Now looked like a from-scratch resync but wasn't one: Clear only called clearDisplay() (a published-counter wipe). The Rust-owned BLAST incremental-sync watermark survived, so the next Sync Now resumed from the checkpoint — Recent queries only, no trunk/branch walk — under a zeroed UI that implied a full rescan. Exactly the "I feel like it isn't really resyncing" QA observation.

Fix

PlatformAddressSyncCoordinator.clearLocalState(), ported from the SwiftExampleApp PlatformBalanceSyncService contract:

1. resetPlatformAddressSyncState() first — drains the in-flight pass and drops the Rust watermark, which is what actually forces the full trunk/branch rescan. Fail closed: on error the display keeps its real state rather than showing a false "cleared".
2. Zero (never delete) the network's PersistentPlatformAddress volatile fields — the rows are durable derivation state the rescan upserts against; deleting them would strand balances until an app relaunch re-seeds them.
3. Delete the PersistentPlatformAddressesSyncState watermark rows — pure volatile state, recreated by the next sync.
4. Clear the display, then re-arm the background loop — the Rust reset deliberately leaves it stopped.

The screen's Clear button now runs this sequence; Sync Now / Clear are gated on the new isClearing flag for its duration.

Test plan

• dashpay arm64-sim build green; installed on QA-iPhone16
• Platform Sync Status → Clear → Sync Now: Queries card shows non-zero Trunk/Branch counts (full walk), balances repopulate
• Clear while offline → error surfaces in Last Error, display NOT falsely zeroed

🤖 Generated with Claude Code

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