Dictate 2.4.0

Meeting transcripts: Dictate now transcribes your calls, entirely on
your Mac. Start a transcript from the menu bar during a browser call
and both sides are captured - your voice from the microphone, everyone
else from system audio - into a live Markdown file. Nothing leaves
your machine, and you confirm before every session starts.

• Speakers are told apart automatically: participants get Speaker 1,
  Speaker 2... labels via local voice diarization, and you can rename
  anyone with a click - in the live session or in an old transcript.

• The transcript window is now a meetings library: past meetings
  grouped by day, full-text search across words and speakers, and the
  live session pinned on top while recording.

• Finished meetings name themselves: on macOS 26 an on-device Apple
  model titles the transcript from what was said (translating first when
  the meeting's language needs it), and files are named like
  "2026-08-10 09.17 - Release planning.md" so Finder sorting stays
  chronological.

• The live window feels alive: a gray in-progress line while a phrase
  is still forming, level meters for both channels, and an honest
  warm-up state instead of silence.

• Phrase boundaries are cut by the same neural voice detector as
  dictation, so breaths and background noise never reach the recognizer,
  and the live preview never delays the actual transcript.

Also fixed: the onboarding "Preparing the model" step now retries by
itself instead of spinning forever if the first attempt fails on a
fresh install.

Full Changelog: v2.3.6...v2.4.0