[sneurlax]

Implement SignVerifyInterface on LibMoneroWallet so Monero wallets get the existing Sign / Verify view. cs_monero 4.0.0 already wraps MONERO_Wallet_signMessage and MONERO_Wallet_verifySignedMessage, so this only forwards them through CsMoneroInterface.

Signatures are wallet2 SigV2 spend-key signatures for the chosen primary address or subaddress, compatible with monero-wallet-cli/rpc sign and verify. wallet2 returns an empty string instead of throwing when signing fails, so treat that as an error. View-only wallets cannot sign.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 14.08%. Comparing base (e93f052) to head (6c49e3c).
⚠️ Report is 6 commits behind head on staging.

Files with missing lines	Patch %	Lines
...wallets/wallet/intermediate/lib_monero_wallet.dart	0.00%	17 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           staging    #1509      +/-   ##
===========================================
+ Coverage    14.01%   14.08%   +0.06%     
===========================================
  Files         1139     1139              
  Lines       114724   114742      +18     
===========================================
+ Hits         16078    16156      +78     
+ Misses       98646    98586      -60     

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