Apply rustfmt pass across all modules

Pure whitespace normalization — no logic changes. Mostly:
- collapsing multi-line match/if arms rustfmt prefers inline
- inlining short `with_context`/`ok_or_else` closures
- reformatting nested method chains for consistency

Build and clippy stay clean.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/detect.rs

@@ -80,10 +80,7 @@ fn collect_prefixes(dir: &Path, depth: u32, out: &mut Vec<PathBuf>) {
     }
 }
 
-fn match_launchers(
-    config: &Config,
-    prefixes: &[PathBuf],
-) -> HashMap<String, Vec<PathBuf>> {
+fn match_launchers(config: &Config, prefixes: &[PathBuf]) -> HashMap<String, Vec<PathBuf>> {
     let mut by_launcher: HashMap<String, Vec<PathBuf>> = HashMap::new();
     for l in &config.launchers {
         for prefix in prefixes {
@@ -114,11 +111,7 @@ fn print_findings(config: &Config, by_launcher: &HashMap<String, Vec<PathBuf>>)
             Some(matches) => {
                 let detected = &matches[0];
                 if *detected == l.prefix_dir {
-                    println!(
-                        "  \x1b[1;32m✓\x1b[0m {:12} {}",
-                        l.name,
-                        detected.display()
-                    );
+                    println!("  \x1b[1;32m✓\x1b[0m {:12} {}", l.name, detected.display());
                 } else {
                     any_divergent = true;
                     println!(
@@ -136,10 +129,7 @@ fn print_findings(config: &Config, by_launcher: &HashMap<String, Vec<PathBuf>>)
     }
 }
 
-fn apply_findings(
-    config: &Config,
-    by_launcher: &HashMap<String, Vec<PathBuf>>,
-) -> Result<()> {
+fn apply_findings(config: &Config, by_launcher: &HashMap<String, Vec<PathBuf>>) -> Result<()> {
     let mut c = config.clone();
     let mut updated = 0;
     let mut ambiguous = 0;