fix(signals): clear uninitialized optimistic async completion

[brenelz]

Summary

• clear STATUS_UNINITIALIZED after the first successful completion of a resting async createOptimistic source
• add a regression test for the first refresh when isPending is the only consumer
• add a patch changeset for @solidjs/signals

Testing

• pnpm --filter @solidjs/signals test -- tests/createOptimistic.test.ts

[changeset-bot]

🦋 Changeset detected

Latest commit: 362fc2f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 9 packages

Name	Type
@solidjs/signals	Patch
test-integration	Patch
solid-js	Patch
babel-preset-solid	Patch
@solidjs/web	Patch
@solidjs/html	Patch
@solidjs/h	Patch
@solidjs/universal	Patch
@solidjs/element	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[codspeed-hq]

Merging this PR will not alter performance

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 1 improved benchmark
❌ 1 regressed benchmark
✅ 116 untouched benchmarks

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
❌	omit	172.1 µs	215.9 µs	-20.28%
⚡	merge	285.2 µs	222.1 µs	+28.41%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing brenelz:fix/optimistic-first-refresh-pending (362fc2f) with next (9892af2)}