Add AudioRecorderComponent sample tests

[shai-almog]

Summary

• add a test-local copy of the AudioRecorderComponent sample for use in unit tests
• create UI-driven tests that drive recording acceptance and cancellation using TestCodenameOneImplementation

Testing

• mvn -f maven/core-unittests/pom.xml -Dtest=com.codename1.samples.AudioRecorderComponentSampleTest test (fails: missing dependency com.codenameone:codenameone-factory:8.0-SNAPSHOT)

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Placeholder file uses host FS instead of Codename One storage

The cancellation test builds a dummy recording file with new FileWriter(path) even though AudioRecorderComponentSample.recordAudio() returns Codename One file URLs (file://app/...) managed by the in-memory TestCodenameOneImplementation storage. Writing via java.io never populates that mock file system (and will throw when the file:// prefix resolves to a non-existent host directory), so the test either fails before exercising the cancel flow or checks deletion against the wrong location. Use FileSystemStorage/Codename One streams (and matching existence checks) so the placeholder resides in the same storage the component deletes.

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