feat: Vim mode (#405)

[tomlin7]

Summary

Implements the basic Vim mode as described in issue #405.

New files

File	Purpose
src/biscuit/editor/text/vim/init.py	Package export
src/biscuit/editor/text/vim/motion.py	Pure cursor-movement helpers (h/j/k/l, w/b/e, 0/$/^, gg/G, word boundaries)
src/biscuit/editor/text/vim/operator.py	Delete/yank/change/paste with internal register + system clipboard sync
src/biscuit/editor/text/vim/vim.py	Core state machine: NORMAL / INSERT / VISUAL / VISUAL LINE / COMMAND
src/biscuit/common/ui/vimbar.py	:\ command-line bar + ephemeral operation messages
src/biscuit/layout/statusbar/keypresslog.py	Keypress display widget (streamer mode)

Modified files

• statusbar.py — color-coded mode indicator (NORMAL/INSERT/VISUAL/COMMAND), keypress display
• text.py — \enable_vim_mode()\ / \disable_vim_mode(), auto-enable on new editors
• commands.py — \ oggle_vim_mode, \ oggle_keypress_display\ (appear in command palette)
• binder.py — \Ctrl+Alt+V\ keybinding
• config.py / settings/config.py — \�im_mode\ and \keypress_display\ flags
• layout/root.py — VimBar wired into layout

Features implemented

• Normal mode: h/j/k/l, w/b/e, 0/$/^, gg/G, dd/yy/p/P, x, dw/diw/cw/ciw, u/Ctrl-R
• Insert mode: i/I/a/A/o/O, Esc to return
• Visual mode: v (char-wise), V (line-wise), d/y/c on selection
• Command mode: :w, :q, :wq, :\ goto-line
• Mode indicator in status bar (click to toggle)
• Vim messages: \1 line yanked, \2 lines deleted, etc. shown in VimBar
• Keypress display: Toggle Keypress Display in command palette (great for streamers)
• All specific bindings (brackets, BackSpace, Return, Tab) correctly guarded in Normal/Visual mode

Closes #405

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Project	Deployment	Actions	Updated (UTC)
biscuit	Ready	Preview, Comment	Jul 18, 2026 5:53pm