yazi: fix unintended recursive calls

Use `command` (POSIX) and `^` (Nushell) to prevent recursive function
calls when `cfg.shellWrapperName` is set to "yazi".

Previously, if `cfg.shellWrapperName` was set to "yazi", the invocation
of `yazi` within the shell integration function triggered the function
itself instead of the binary. This name conflict prevents users from
using the binary name as-is when shell integration is enabled.

Hence, fix this by using shell-specific mechanisms to target the
underlying executable, bypassing any name collisions.

This aligns with the official documentation:
- 2c839b37c8/docs/quick-start.md (L29)
- 2c839b37c8/docs/quick-start.md (L56)

tests/modules/programs/yazi/bash-integration-enabled.nix

@@ -10,7 +10,7 @@
     assertFileExists home-files/.bashrc
     assertFileContains home-files/.bashrc 'function yy() {'
     assertFileContains home-files/.bashrc 'local tmp="$(mktemp -t "yazi-cwd.XXXXX")"'
-    assertFileContains home-files/.bashrc 'yazi "$@" --cwd-file="$tmp"'
+    assertFileContains home-files/.bashrc 'command yazi "$@" --cwd-file="$tmp"'
     assertFileContains home-files/.bashrc 'if cwd="$(<"$tmp")" && [ -n "$cwd" ] && [ "$cwd" != "$PWD" ]; then'
     assertFileContains home-files/.bashrc 'builtin cd -- "$cwd"'
     assertFileContains home-files/.bashrc 'rm -f -- "$tmp"'

tests/modules/programs/yazi/nushell-integration-enabled.nix

@@ -4,7 +4,7 @@ let
   shellIntegration = ''
     def --env yy [...args] {
       let tmp = (mktemp -t "yazi-cwd.XXXXX")
-      yazi ...$args --cwd-file $tmp
+      ^yazi ...$args --cwd-file $tmp
       let cwd = (open $tmp)
       if $cwd != "" and $cwd != $env.PWD {
         cd $cwd

tests/modules/programs/yazi/zsh-integration-enabled.nix

@@ -10,7 +10,7 @@
     assertFileExists home-files/.zshrc
     assertFileContains home-files/.zshrc 'function yy() {'
     assertFileContains home-files/.zshrc 'local tmp="$(mktemp -t "yazi-cwd.XXXXX")"'
-    assertFileContains home-files/.zshrc 'yazi "$@" --cwd-file="$tmp"'
+    assertFileContains home-files/.zshrc 'command yazi "$@" --cwd-file="$tmp"'
     assertFileContains home-files/.zshrc 'if cwd="$(<"$tmp")" && [ -n "$cwd" ] && [ "$cwd" != "$PWD" ]; then'
     assertFileContains home-files/.zshrc 'builtin cd -- "$cwd"'
     assertFileContains home-files/.zshrc 'rm -f -- "$tmp"'