fix: make solid adapter behave more like how we'd expect

[crutchcorn]

This PR migrates us away from solid-js/store and towards shallow selection. It appears to fix some issues we were running into with Form and may even increase performance for our needs

[nx-cloud]

View your CI Pipeline Execution ↗ for commit 5ec8ab4

Command	Status	Duration	Result
nx affected --targets=test:sherif,test:knip,tes...	✅ Succeeded	36s	View ↗
nx run-many --target=build --exclude=examples/**	✅ Succeeded	1s	View ↗

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☁️ Nx Cloud last updated this comment at 2025-07-06 22:09:11 UTC

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commit: 5ec8ab4