tmproto.Header -> sdk.Header

[pompon0]

sei-cosmos unnecessarily depends on tmproto.Header and uses it in a degenerate way.

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Feb 19, 2026, 1:31 PM

[codecov]

Codecov Report

❌ Patch coverage is 78.08219% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.36%. Comparing base (2a1ccca) to head (87e5c60).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
sei-cosmos/x/simulation/mock_tendermint.go	0.00%	4 Missing ⚠️
app/export.go	0.00%	2 Missing ⚠️
app/test_helpers.go	33.33%	2 Missing ⚠️
sei-cosmos/baseapp/baseapp.go	81.81%	2 Missing ⚠️
sei-cosmos/x/simulation/simulate.go	0.00%	2 Missing ⚠️
app/apptesting/test_suite.go	66.66%	1 Missing ⚠️
sei-ibc-go/testing/simapp/export.go	0.00%	1 Missing ⚠️
sei-ibc-go/testing/simapp/test_helpers.go	0.00%	1 Missing ⚠️
sei-wasmd/app/test_helpers.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2933      +/-   ##
==========================================
+ Coverage   57.33%   57.36%   +0.03%     
==========================================
  Files        2089     2095       +6     
  Lines      172126   172866     +740     
==========================================
+ Hits        98683    99164     +481     
- Misses      64646    64821     +175     
- Partials     8797     8881      +84     

Flag	Coverage Δ
sei-chain	52.86% <62.50%> (+0.05%)	⬆️
sei-cosmos	48.20% <81.81%> (+<0.01%)	⬆️
sei-db	68.42% <ø> (-0.31%)	⬇️

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

Files with missing lines	Coverage Δ
app/abci.go	66.92% <100.00%> (ø)
app/app.go	71.31% <ø> (-1.43%)	⬇️
occ_tests/utils/utils.go	85.43% <100.00%> (ø)
sei-cosmos/baseapp/abci.go	66.21% <100.00%> (-0.06%)	⬇️
sei-cosmos/baseapp/test_helpers.go	76.92% <100.00%> (ø)
sei-cosmos/testutil/context.go	80.00% <100.00%> (ø)
sei-cosmos/types/context.go	93.67% <100.00%> (-0.15%)	⬇️
sei-cosmos/x/staking/types/historical_info.go	71.42% <100.00%> (ø)
sei-cosmos/x/upgrade/client/testutil/suite.go	100.00% <100.00%> (ø)
sei-ibc-go/testing/chain.go	93.98% <100.00%> (ø)
... and 16 more

... and 54 files with indirect coverage changes

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