fix(persisted-state): write state to storage even if only a nested property is changed. fixes #224

[gyszalai]

Integrated Rich Harris's proxy solution to solve watching nested properties:
https://github.com/Rich-Harris/local-storage-test/blob/main/src/lib/storage.svelte.ts

Had to update existing tests as the getter for current always deserializes the state from storage.

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[webJose]

I would say this is not the best approach. One can leverage the deep reactive nature of Svelte v5 and have an $effect serialize and store the value. This should pick up on any changed property along the chain of objects.

[gyszalai]

I would say this is not the best approach. One can leverage the deep reactive nature of Svelte v5 and have an $effect serialize and store the value. This should pick up on any changed property along the chain of objects.

@webJose you are absolutely right! My first solution was to use $effect, it was much simpler. However, with that solution the state is not written to the storage synchronously, but asynchronously in the next tick and this broke all tests.

[TGlide]

This is the best approach until sveltejs/svelte#15069 lands. Thanks!