refactor(key-wallet): drop unused first_loaded_at and total_transactions from WalletMetadata

[QuantumExplorer]

Summary

• Drops first_loaded_at and total_transactions from WalletMetadata; neither field is read by any consumer.
• Removes WalletInfoInterface::{first_loaded_at, set_first_loaded_at}, the ManagedWalletInfo::increment_transactions helper, and the six WalletManager call sites that wrote first_loaded_at after from_wallet.
• Strips test assertions in wallet_checker and wallet/mod.rs that exercised the removed fields.

Test plan

• cargo build --workspace
• cargo test -p key-wallet -p key-wallet-manager
• cargo clippy -p key-wallet -p key-wallet-manager --all-targets -- -D warnings
• cargo fmt --check

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

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Review profile: CHILL

Plan: Pro

Run ID: 7f8982ca-9235-44c7-8661-d7c91f567f8a

📥 Commits

Reviewing files that changed from the base of the PR and between fcaf66e and 15d622e.

📒 Files selected for processing (6)

• key-wallet-manager/src/lib.rs
• key-wallet/src/transaction_checking/wallet_checker.rs
• key-wallet/src/wallet/managed_wallet_info/mod.rs
• key-wallet/src/wallet/managed_wallet_info/wallet_info_interface.rs
• key-wallet/src/wallet/metadata.rs
• key-wallet/src/wallet/mod.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/frosty-benz-fdfc3c

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[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.59%. Comparing base (fcaf66e) to head (15d622e).
⚠️ Report is 1 commits behind head on v0.42-dev.

Files with missing lines	Patch %	Lines
key-wallet-manager/src/lib.rs	66.66%	2 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##           v0.42-dev     #719      +/-   ##
=============================================
+ Coverage      70.57%   70.59%   +0.01%     
=============================================
  Files            319      319              
  Lines          68211    68183      -28     
=============================================
- Hits           48142    48132      -10     
+ Misses         20069    20051      -18     

Flag	Coverage Δ
core	75.81% <ø> (ø)
ffi	43.37% <ø> (ø)
rpc	20.00% <ø> (ø)
spv	87.32% <ø> (+0.10%)	⬆️
wallet	69.61% <66.66%> (-0.04%)	⬇️

Files with missing lines	Coverage Δ
...-wallet/src/transaction_checking/wallet_checker.rs	99.38% <ø> (-0.01%)	⬇️
key-wallet/src/wallet/managed_wallet_info/mod.rs	68.42% <ø> (-1.58%)	⬇️
...allet/managed_wallet_info/wallet_info_interface.rs	83.22% <ø> (+1.23%)	⬆️
key-wallet/src/wallet/mod.rs	88.17% <ø> (-0.04%)	⬇️
key-wallet-manager/src/lib.rs	62.10% <66.66%> (-0.73%)	⬇️

... and 4 files with indirect coverage changes