v0.4.0

Changelog

• 3de2992 Merge feat/themes: switchable colour themes, picked live with t or :theme and kept across restarts
• c8be7b3 Merge fix/sidebar-theme-key: t opens the theme picker from the sidebar too
• b906233 Merge refactor/overlay-box: render draws the one open box, found by openBox
• 2b90d6b feat(theme): save the chosen theme's name, and load it back or the default
• 92ad8be feat(theme): twelve dark themes by name, Macchiato first and the fallback
• 0755c77 feat(ui): :theme opens the picker, :theme switches and saves, with completion
• 850d245 feat(ui): UseTheme restyles every part, its tables, prompts and coloured rows
• 372311b feat(ui): t opens a theme picker that previews as it moves; enter keeps and saves
• c8cb3f2 feat: brewery starts in the theme you last kept; README covers themes
• 9c7bf2f fix(ui): t opens the theme picker from the sidebar too
• 1c6df80 refactor(ui): each part sets its own styles, themes are found by one Index, and boxes share a frame
• 4552274 refactor(ui): render draws the one open box, found by openBox
• 9e90bb4 refactor(ui): sync already rebuilds Discover's rows; the completion test fails cleanly