Add fallback names to signal transforms

[JoviDeCroock]

Unnamed effects and reactive primitives are difficult to identify in debugging tools when the transform cannot derive a contextual name.

Transform effects and signal effects too, and fall back to file:line while preserving explicit names.

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🦋 Changeset detected

Latest commit: 64e040e

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

This PR includes changesets to release 2 packages

Name	Type
@preact/signals-preact-transform	Patch
@preact/signals-react-transform	Patch

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Size Change: -7.75 kB (-4.08%)

Total Size: 182 kB

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