feat(keybindings): add Ctrl+Alt+U to replace first command token

conf.d/keybindings.fish

@@ -0,0 +1,11 @@
+# Copyright (C) 2026 Rootiest
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+if not status is-interactive
+    exit
+end
+
+# Ctrl+Alt+U — strip the first command token and place cursor at start to retype it
+for mode in default insert
+    bind --mode $mode ctrl-alt-u _replace_command_token
+end

functions/_replace_command_token.fish

@@ -0,0 +1,6 @@
+function _replace_command_token --description 'Remove first token from commandline and place cursor at start'
+    set -l cmd (commandline)
+    set -l rest (string replace -r '^\S+\s*' '' -- $cmd)
+    commandline -- $rest
+    commandline -C 0
+end