fix: show Zcash transparent address metadata

[Arbeitszeit]

Issue Number (if Applicable): N/A

Description

This change provides real transaction-count and balance metadata for rotated Zcash transparent addresses instead of displaying null, while preserving address labels across refreshes.

Changes

• Fix rotated-account lookup to use the integer account ID rather than a seed string as a map key.
• Track transparent balance and transaction count for each rotated account using the existing Warp API data.
• Associate address-list entries with their actual rotated account IDs.
• Refresh address metadata during wallet balance updates.
• Preserve user labels when the transparent address list is rebuilt.
• Allow Zcash transparent address labels to be edited and persisted.
• Include transparent funds in the wallet's frozen balance until they are shielded, so deposits remain visible without being treated as immediately spendable.
• Recognize rotated addresses in containsAddress().

Validation

• git diff --check passes.
• Runtime validation with restored and existing Zcash wallets is still required. The Flutter/native build toolchain was not available in the analysis environment.

Pull Request - Checklist

• Initial Manual Tests Passed
• Double check modified code and verify it with the feature/task requirements
• Format code
• Look for code duplication
• Clear naming for variables and methods
• Manual tests in accessibility mode (TalkBack on Android) passed