feat(svelte): allow dynamic Store instance

[wobsoriano]

The useStore() function needs to be updated to accommodate dynamic Store instance values from @tanstack/db. See full discussion.

This PR already reruns the $effect callback when the Store instance changes but the .subscribe callback never gets invoked. Tbh not sure if this is optimal but I don't see an obvious better way of reacting to @tanstack/db's compiledQuery changes.

cc @crutchcorn

[nx-cloud]

View your CI Pipeline Execution ↗ for commit 826d8bf.

Command	Status	Duration	Result
nx affected --targets=test:sherif,test:knip,tes...	❌ Failed	31s	View ↗
nx run-many --target=build --exclude=examples/**	✅ Succeeded	3s	View ↗

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☁️ Nx Cloud last updated this comment at 2025-05-18 19:59:24 UTC

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commit: 826d8bf