feat: offline queue improvements (#240, #241, #242, #243)

[Johnero542]

#241 — Extend offline queue to deposit/withdraw (Android + iOS)

• Android: add DEPOSIT/WITHDRAW to PendingActionType enum; add DepositPayload/WithdrawPayload serializable data classes; bump Room DB version to 2; PendingActionSyncWorker drains all four action types; DepositViewModel/WithdrawViewModel queue offline instead of surfacing a plain error
• iOS: new PendingActionStore generalises PendingCheckInStore for checkIn/deposit/withdraw; CheckInSyncTask drains all three types; APIClientProtocol/APIClient extended with deposit+withdraw; VaultStore queues deposit/withdraw offline with dedup semantics matching Android

#243 — Configurable TTL / staleness indicator (Android + iOS)

• Android: OfflineCache gains maxAgeMs (default 24 h) and isCachedAtStale(); VaultUiState.cachedAt flows to OfflineBanner showing 'as of X ago' when serving cached data
• iOS: OfflineCache.maxAge defaulted to 24 h in init; new OfflineCacheBanner view shown in VaultListView when offline or serving cached data

#242 — Cache hit/miss/stale telemetry (Android + iOS)

• Android: CacheTelemetry object with AtomicLong counters wired into OfflineCache.load(); DebugScreen composable added; info button in vault list TopAppBar navigates to it
• iOS: CacheTelemetry class added to OfflineSupport.swift; wired into OfflineCache.load(); SupportDebugView in Settings shows counters with Reset button

#240 — Manual Retry Now button (Android + iOS)

• Android: PendingActionSyncWorker.scheduleImmediate() uses ExistingWorkPolicy.REPLACE for immediate no-backoff drain; VaultViewModel.retryNow() calls it; queued-actions banner with 'Retry Now' TextButton shown when queuedActionCount > 0
• iOS: CheckInSyncTask.retryNow() calls performSync() directly; VaultStore.retryNow() async exposed; 'Retry Now' button shown in VaultListView when queuedActionCount > 0

chore: update .gitignore (all three levels)

• Exclude test snapshot images (Paparazzi / screenshot tests)
• Exclude iOS Snapshots / ReferenceImages directories
• Remove 14 already-tracked snapshot PNGs from index
• Add common secrets / credential file patterns

Closes #240
Closes #241
Closes #242
Closes #243

Summary

Changes

Testing

Parity checklist

This project maintains a feature-parity table in PARITY.md that
tracks which features are implemented on iOS vs Android. Please answer the
questions below before requesting review.

• This PR does not add, change, or remove any user-facing feature on either
  platform — no PARITY.md update needed.

  — OR —

• This PR adds/changes/removes a user-facing feature. I have updated PARITY.md:

  • Updated the status symbol(s) for the affected row(s).
  • Added or updated "Notes" if the implementation is partial or has caveats.
  • Removed or updated any rows in the "Known gaps" table that this PR closes.

Related issues

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