test(chrome-extension): verify WebRTC session description formatting

[gcoinstash-cmd]

Summary of Changes

• Adds unit test coverage for WebRTC session description exchange in Chrome extension recording pipeline.
• Test suite passed 100% green.

Greptile Summary

Adds unit coverage for Chrome-extension WebRTC session-description formatting and shared recorder utilities.

• Verifies offer and answer serialization plus missing-description handling.
• Covers recording-mode label heuristics, cancellation classification, and display-media retry classification.

Confidence Score: 5/5

The PR appears safe to merge because it only adds tests whose fixtures and expectations match the existing implementations and test environments.

No blocking or non-blocking defects remain; the added WebRTC and recorder-core assertions exercise their intended existing behavior without changing production code.

Important Files Changed

Filename	Overview
apps/chrome-extension/src/shared/webrtc.test.ts	Adds tests consistent with the WebRTC helper’s serialization and null-input behavior.
packages/recorder-core/tests/recorder-utils.test.ts	Adds tests matching current recording-mode detection and capture-error classification contracts.

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