testfix: delayed WAL closing

[pompon0]

When consensus WAL is closed while consensus is running, some of the messages might get dropped (handler panics -> processing loop recovers the panic and continues). The solution is to close WAL only once consensus state Run() terminates. Also this recover seems to be dangerous itself (because of recover), will investigate in a separate pr.

also refactored a bunch of functions to be methods of testState which is now a wrapper of State, which also acts as a handler of bunch of goroutines operating on the State.

THE ACTUAL FLAKINESS FIX is included in this pr, but it is not related to the WAL closing error logs. The problem was due to constructing a proposal in the wrong consensus round.

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Apr 28, 2026, 2:42 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.19%. Comparing base (d67dd88) to head (0c439a2).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3327      +/-   ##
==========================================
- Coverage   59.19%   59.19%   -0.01%     
==========================================
  Files        2097     2097              
  Lines      172482   172477       -5     
==========================================
- Hits       102106   102101       -5     
  Misses      61532    61532              
  Partials     8844     8844              

Flag	Coverage Δ
sei-chain-pr	68.78% <ø> (?)
sei-db	70.41% <ø> (ø)

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Files with missing lines	Coverage Δ
sei-tendermint/internal/consensus/state.go	75.48% <ø> (-0.09%)	⬇️

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