fix(rewards): guard CalculateReward against non-positive elapsed time

[amathxbt]

Summary

Bug: If blockTime <= LastReleaseTime (clock skew, same-block re-entry, or governance setting LastReleaseTime close to block time), timeElapsedNs was zero or negative.

• Zero: releaseProportion = 0 — silent no-op, acceptable
• Negative: releaseProportion < 0 — amountToRelease < 0 — sdk.NewCoin panics with "negative coin amount", halting the chain

Fix: Return a zero coin early when timeElapsedStamp.Nanoseconds() <= 0.

Files changed

• x/rewards/types/reward.go

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Reviewing files that changed from the base of the PR and between e0d3113 and 865151a.

📒 Files selected for processing (1)

• x/rewards/types/reward.go

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
x/rewards/types/reward.go	0.00%	1 Missing and 1 partial ⚠️

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