Sill 0.4.6

• Dictation: The local whisper.cpp engine updates on its own schedule
  instead of waiting for a Sill release. When a newer stable build is out,
  Settings shows a dot on Dictation and an Update button at the top of the
  Local server card; nothing installs until it is pressed. The new build
  downloads beside the current one and has to match GitHub's published
  checksum, still accept every option Sill starts it with, and load your model
  before it replaces anything. A dictation being transcribed finishes first.
  A build that fails is removed, the previous engine keeps running, and the
  card says what went wrong.
• Dictation: A first local setup installs whisper.cpp's newest release,
  and falls back to 1.9.3 when GitHub cannot be reached or the newest will not
  load a model.
• Dictation: Transcriptions sent through OpenRouter are credited to Sill.