fix(devtools): resolve ts7006 implicit-any bug

[vedanshshetti]

Summary

This PR fixes TypeScript strict‑mode errors (TS7006: Parameter 'key' implicitly has an 'any' type) in the internal devtools packages by explicitly typing the selection.subscribe callback parameter as unknown. The issue appeared in both the React and Solid devtools implementations.

Changes

React_devtools_fix

Updated unsubSelection = selection.subscribe((key) => { ... }) to
unsubSelection = selection.subscribe((key: unknown) => { ... })
in packages/devtools-react/src/index.tsx.

Solid_devtools_fix

Applied the same fix in packages/devtools-solid/src/index.tsx for consistency.

Why this matters

Each item begins with a Guided Link.

TS_strict_mode

TypeScript’s strict mode flags untyped callback parameters as implicit any, which breaks builds and reduces type safety.

Internal_consistency

Both devtools implementations now use the same safe typing strategy, preventing future strict‑mode regressions.

Zero_runtime_change

This PR only affects type annotations. No runtime behavior or public API surface is changed.

Scope

This PR is strictly internal cleanup.
It does not modify logic, behavior, or user‑facing features.

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Suggested change

	unsubSelection = selection.subscribe((key: unknown) => {
	unsubSelection = selection.subscribe((key) => {

selection.subscribe callback param typed (key: unknown) fails type-check because narrowed {} is not assignable to highlightElement's string parameter (TS2345)

[vercel]

Suggested change

	const unsubSelection = selection.subscribe((key: unknown) => {
	const unsubSelection = selection.subscribe((key) => {

Annotating the selection.subscribe callback parameter as (key: unknown) breaks the type-check because highlightElement requires a string, but unknown narrowed by if (key) becomes {}.