Fix SignalValue component when using react-transform

[andrewiggins]

When using the react-transform, components aren't automatically tracked for signal usage. So the SignalValue component isn't reactive to signal changes. This PR manually codes the SignalValue to use useSignals to track signal usage regardless of the implementation.

Related #412

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Latest commit: b45b041e4d89f6f952af485e7dc5dd5ec780f602

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Size Change: +1.07 kB (+1%)

Total Size: 80.8 kB

Filename	Size	Change
docs/dist/assets/client.********.js	47 kB	+371 B (+1%)
docs/dist/nesting-********.js	1.13 kB	-1 B (0%)
docs/dist/react-********.js	237 B	-1 B (0%)
packages/react-transform/dist/signals-*********.js	3.55 kB	+31 B (+1%)
packages/react-transform/dist/signals-transform.mjs	2.87 kB	+32 B (+1%)
packages/react-transform/dist/signals-transform.umd.js	3.67 kB	+30 B (+1%)
packages/react/dist/signals.js	1.62 kB	+270 B (+20%)	🚨
packages/react/dist/signals.mjs	1.64 kB	+341 B (+26%)	🚨

ℹ️ View Unchanged

| Filename | Size | | :--- | :---: | | `docs/dist/assets/index.********.js` | 833 B | | `docs/dist/assets/jsxRuntime.module.********.js` | 281 B | | `docs/dist/assets/preact.module.********.js` | 4.02 kB | | `docs/dist/assets/signals-core.module.********.js` | 1.46 kB | | `docs/dist/assets/signals.module.********.js` | 2.02 kB | | `docs/dist/assets/style.********.js` | 21 B | | `docs/dist/assets/style.********.css` | 1.21 kB | | `docs/dist/basic-********.js` | 244 B | | `docs/dist/demos-********.js` | 3.35 kB | | `packages/core/dist/signals-core.js` | 1.54 kB | | `packages/core/dist/signals-core.mjs` | 1.56 kB | | `packages/preact/dist/signals.js` | 1.27 kB | | `packages/preact/dist/signals.mjs` | 1.22 kB |

_{compressed-size-action}

[andrewiggins]

Abandoning this for the moment. May revisit later after resolving other issues first