refactor: style usage based on command style

Clap 4.4 stabilized Command::get_styles(). This allows the make_usage()
helper to construct the styled usage string using the default literal
style instead of hardwiring bold.

src/cmd/mod.rs

@@ -135,19 +135,21 @@ pub(crate) enum Error {
     NoAppliedPatches,
 }
 
+pub(crate) const STYLES: clap::builder::Styles = clap::builder::Styles::styled();
+
 pub(crate) fn make_usage(command_name: &str, usages: &[&str]) -> clap::builder::StyledStr {
     use std::fmt::Write as _;
     let mut s = StyledStr::new();
-    let bold = anstyle::Style::new().bold();
+    let literal = STYLES.get_literal();
     for (i, &usage) in usages.iter().enumerate() {
         let indent = if i == 0 { "" } else { "       " };
         let end = if i + 1 == usages.len() { "" } else { "\n" };
         let sep = if usage.is_empty() { "" } else { " " };
         write!(
             s,
             "{indent}{}{command_name}{}{sep}{usage}{end}",
-            bold.render(),
-            bold.render_reset()
+            literal.render(),
+            literal.render_reset()
         )
         .unwrap();
     }

src/main.rs

@@ -51,6 +51,7 @@ const CONFLICT_ERROR: i32 = 3;
 /// cost of instantiating [`clap::Command`] instances for every StGit subcommand.
 fn get_base_command(color_choice: Option<termcolor::ColorChoice>) -> clap::Command {
     let mut command = clap::Command::new("stg")
+        .styles(cmd::STYLES)
         .about("Maintain a stack of patches on top of a Git branch.")
         .override_usage(cmd::make_usage(
             "stg",