changelog for nightly.15

Author: yujonglee

apps/web/content/changelog/1.0.0-nightly.15.mdx

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+---
+created: "2025-12-10T11:33:49Z"
+---
+
+- Implement free trial support in desktop app with new onboarding flow.
+- Add full Gladia STT support with code switching, partial transcripts, multi-channel audio, custom vocabulary, and speaker diarization.
+- Fix hooks plugin functionality and improve event handling.
+- Introduce keys.json for better state management in TinyBase store.
+- Improve profile name rendering in sidebar.