Wait for address association before balance assertions

[masih]

The Autobahn associate-balance test was flaky because associateKeyStrict returned after submitting seid tx evm associate-address and waiting a fixed number of blocks. In the failing run, the associate transaction had returned, but the EVM/Sei address association was not visible to the balance query yet, so the test read the pre-association EVM balance (200) instead of the expected converted Sei balance.

Fix this by waiting on the causal post-state: query seid q evm evm-addr until it reports associated: true for the Sei address. This makes the test proceed only once the association side effect is observable, instead of relying on block timing.

Flaked here.

[cursor]

PR Summary

Low Risk
Test-only changes in contracts/test/lib.js with no production or chain logic impact.

Overview
associateKeyStrict no longer uses a fixed waitForBlocks after associate-address. It polls seid q evm evm-addr until associated: true for the key’s Sei address, using the existing waitForCondition pattern used elsewhere in the test lib.

A new getEvmAddressAssociation helper returns the full query JSON; getEvmAddress now reads evm_address from that response instead of parsing the query inline.

This targets Autobahn flakiness where associate-balance tests asserted balances before the association was visible to queries.

^{Reviewed by Cursor Bugbot for commit 5f0ef68. Bugbot is set up for automated code reviews on this repo. Configure here.}

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Jun 15, 2026, 8:18 AM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.35%. Comparing base (0a2c388) to head (5f0ef68).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3584      +/-   ##
==========================================
- Coverage   59.22%   58.35%   -0.87%     
==========================================
  Files        2214     2140      -74     
  Lines      183389   174842    -8547     
==========================================
- Hits       108604   102031    -6573     
+ Misses      64994    63720    -1274     
+ Partials     9791     9091     -700     

Flag	Coverage Δ
sei-db	70.41% <ø> (ø)
sei-db-state-db	?

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