Persist transcription engine choice in presets

[nmbrthirteen]

Follow-up to #48.

The AssemblyAI vs Whisper engine selector already exists in the studio (added in 5f27df4, shipped in v2.3.0/v2.3.1) and the CLI already has --engine/--assemblyai-api-key. The reporter's screenshot shows the older "Auto (Whisper)" tab, so they were on a pre-v2.3.0 build.

This adds the one thing still missing for "consistently choose their preferred engine": the engine choice was component-local React state that reset on reload. Now it's saved with the preset config and restored on load, exactly like whisper_model. The AssemblyAI API key is deliberately not persisted here (it lives in the global .env via ASSEMBLYAI_API_KEY, the secure store).

Build passes.

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Reviewing files that changed from the base of the PR and between da158e6 and 6c275d6.

📒 Files selected for processing (1)

• src/ui/client/EpisodeWorkspace.jsx

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• Create PR with unit tests
• Commit unit tests in branch feat/persist-transcription-engine

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