Refactor help output formatting for improved clarity and readability

- Updated subcommand help to display one summary line per subcommand, followed by detailed flag descriptions.
- Added individual alignment for flag columns across subcommands for consistent presentation.
- Replaced compact inline summaries with a more structured format to prevent line wrapping and improve visual layout.
- Enhanced flag argument handling by introducing `value

src/cli.rs

@@ -71,15 +71,15 @@ pub struct EditArgs {
     pub name: String,
 
     /// Enable or disable the self-monitor loopback.
-    #[arg(short, long)]
+    #[arg(short, long, value_name = "BOOL")]
     pub loopback: Option<bool>,
 
     /// Loopback volume: fraction (0.8) or percent (80).
-    #[arg(short, long)]
+    #[arg(short, long, value_name = "PCT")]
     pub volume: Option<f32>,
 
     /// Mixed-in source volume: fraction (0.8) or percent (80).
-    #[arg(long = "source-volume", visible_alias = "sv")]
+    #[arg(long = "source-volume", visible_alias = "sv", value_name = "PCT")]
     pub source_volume: Option<f32>,
 }