fix(giga): only schedule if necessary

[arajasek]

Describe your changes and provide context

Avoid unnecessary scheduling if there aren't any txs.

Testing performed to validate your change

Tests pass.

[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	Feb 6, 2026, 12:11 AM

[codecov]

Codecov Report

❌ Patch coverage is 83.92857% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.62%. Comparing base (5c26262) to head (76d4e26).

Files with missing lines	Patch %	Lines
app/app.go	82.35%	6 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2810      +/-   ##
==========================================
+ Coverage   56.58%   56.62%   +0.03%     
==========================================
  Files        2033     2033              
  Lines      166263   166268       +5     
==========================================
+ Hits        94074    94143      +69     
+ Misses      63926    63857      -69     
- Partials     8263     8268       +5     

Flag	Coverage Δ
sei-chain	41.52% <83.92%> (+0.01%)	⬆️
sei-cosmos	48.13% <40.00%> (-0.01%)	⬇️
sei-db	68.72% <ø> (ø)
sei-tendermint	58.01% <ø> (+0.13%)	⬆️

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

Files with missing lines	Coverage Δ
sei-cosmos/types/context.go	93.93% <100.00%> (+0.11%)	⬆️
app/app.go	68.22% <82.35%> (+2.08%)	⬆️

... and 33 files with indirect coverage changes

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