Bind Ctrl+F in vi keymaps for zsh

[Christian-Sidak]

The zsh integration installs the widget with a bare bindkey '^F', which only touches whichever keymap is the current main keymap at source time. If you enable vi mode with bindkey -v after shelloracle.zsh is sourced (the usual order when the plugin line comes before the vi-mode line in .zshrc), the binding stays behind in the emacs keymap and Ctrl+F falls through to self-insert. Even with bindkey -v first, the widget was never bound in vicmd.

This binds the widget explicitly in emacs, viins, and vicmd, which is the same thing the bash integration already does with bind -m emacs-standard, bind -m vi-insert, and bind -m vi-command. It also matches how fzf handles its zsh keybindings.

Checked with zsh -f in all four orderings (emacs default, source then bindkey -v, bindkey -v then source, and bindkey -M vicmd '^F' after each), and the widget is bound in every case now. Before the change, source-then-bindkey -v left viins on self-insert and vicmd on undefined-key.

Fixes #51

[Christian-Sidak]

Wanted to check in on this. The fix is straightforward: bindkey -v after the plugin sources means the widget only lands in the emacs keymap, so vi-mode users never see Ctrl+F work. Binding explicitly in viins and vicmd is the correct fix - I use zsh vi mode and tested it; the widget fires correctly in both insert and normal mode now. Is there anything blocking this from merging?

[djcopley]

nope, lgtm!