bubo v0.8.4

bubo 0.8.4

This release is about moving around the app faster and knowing what a practice
card wants from you before you type.

What's new

• Settings tabs: the settings screen used to be one long scroll. It now has
  five tabs — Learning, Connection, Practice, Appearance and System — with arrow,
  Home and End navigation, and each tab opens at the top.
• Two-row header: new chat, history, progress and practice moved to their own
  row under the bubo title. Pin, compact, popup, settings and hide stay on the
  first row.
• Mascot preview stays put: in the customization screen the preview is now
  sticky, so the eye and mouth controls can be changed with the mascot still on
  screen instead of scrolling back and forth.
• Hint before the answer: a practice card now shows the correction note (for
  example past simple) while you type, instead of only after the review. A note
  that already spells out the correction is held back, so the answer stays
  hidden until you commit to one.
• Message search: the search button matches the send button again, Escape
  closes the search, and the mascot steps out of the way while it is open.

Upgrade

Nothing to do. Settings → Updates offers 0.8.4 like any other version.

Build

• Version 0.8.4, build 1.
• x64 installer signed with the updater key (not Authenticode); SmartScreen may
  warn on first run.
• Update packages are verified with the Tauri updater signing key.

Verification

• 82 Vitest tests, 78 Rust tests, 34 Playwright tests, clippy, fmt, and build
  clean, locally and in CI.