Add no-op support for JVM / JS targets

[wellingtoncosta]

See discussion #101

[Copilot]

🟡 Changes recommended

The new “Supported targets” doc text is misleading about Bugsnag JVM/JS support and should be clarified for accuracy.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

Adds JVM and JS “no-op” support so CrashKiOS can be depended on from commonMain in multiplatform projects that also target JVM/JS, aligning with the linked feature request discussion.

Changes:

• Added JVM/JS actual implementations for Crashlytics/Bugsnag calls that intentionally no-op on unsupported targets.
• Added JVM/JS actual implementations for ThreadSafeVar and enabled jvm + js targets in affected modules.
• Updated docs to describe supported targets and committed the Kotlin/JS yarn lockfile for the new JS targets.

File summaries

File	Description
website/docs/index.md	Documents JVM/JS no-op behavior and guidance for using commonMain.
kotlin-js-store/yarn.lock	Adds Kotlin/JS-generated Yarn lockfile needed by the new JS targets.
crashlytics/src/jvmMain/.../CrashlyticsCallsActual.kt	JVM no-op Crashlytics actual implementation.
crashlytics/src/jsMain/.../CrashlyticsCallsActual.kt	JS no-op Crashlytics actual implementation.
crashlytics/build.gradle.kts	Enables JVM + JS targets for the crashlytics module.
core/src/jvmMain/.../ThreadSafeVar.kt	JVM actual implementation of ThreadSafeVar.
core/src/jsMain/.../ThreadSafeVar.kt	JS actual implementation of ThreadSafeVar.
core/build.gradle.kts	Enables JVM + JS targets for the core module.
bugsnag/src/jvmMain/.../BugsnagCallsActual.kt	JVM no-op Bugsnag actual implementation.
bugsnag/src/jsMain/.../BugsnagCallsActual.kt	JS no-op Bugsnag actual implementation.
bugsnag/build.gradle.kts	Enables JVM + JS targets for the bugsnag module.

Review details

• Files reviewed: 10/11 changed files
• Comments generated: 1
• Review effort level: Lite

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