Backport release/v6.5: added a ProposerAddress check to setProposal CON-250

[seidroid]

Backport of #3232 to release/v6.5.

[seidroid]

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin backport-3232-to-release/v6.5
git worktree add --checkout .worktree/backport-3232-to-release/v6.5 backport-3232-to-release/v6.5
cd .worktree/backport-3232-to-release/v6.5
git reset --hard HEAD^
git cherry-pick -x 21433ced1c9719c11693d792e3d18bc32467870b
git push --force-with-lease

[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	May 1, 2026, 8:41 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.31%. Comparing base (a89d86b) to head (c68882f).

Additional details and impacted files

@@              Coverage Diff              @@
##           release/v6.5    #3370   +/-   ##
=============================================
  Coverage         58.31%   58.31%           
=============================================
  Files              2093     2093           
  Lines            173242   173242           
=============================================
+ Hits             101029   101030    +1     
+ Misses            63152    63151    -1     
  Partials           9061     9061           

Flag	Coverage Δ
sei-db	70.62% <ø> (+0.21%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
sei-tendermint/internal/consensus/state.go	75.44% <ø> (ø)

... and 1 file with indirect coverage changes

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