fix(desktop): support batch transcription for custom STT provider

[AzimovS]

Summary

• The "Custom" STT provider was missing from BATCH_PROVIDER_MAP in useRunBatch.ts, causing getBatchProvider() to return null and batch transcription to fail with "Batch transcription is not supported for provider: custom"
• Maps custom to the deepgram adapter since custom endpoints use the Deepgram-compatible protocol

Context

When live WebSocket streaming fails (e.g., the custom endpoint only supports HTTP), the app falls back to batch mode and records audio to disk. However, clicking the refresh button to trigger batch transcription threw an error because the custom provider had no batch adapter mapping.

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Note

Low Risk
Low risk: a small mapping change that routes custom batch requests through the existing Deepgram-compatible adapter, with minimal impact outside batch provider selection.

Overview
Fixes batch transcription for the custom STT provider by adding it to BATCH_PROVIDER_MAP in useRunBatch.ts, mapping custom to the deepgram batch adapter so getBatchProvider() no longer returns null.

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