improve error handling

src/overlays/keyboard.rs

@@ -87,7 +87,10 @@ where
                     });
                 } else if let Some(exec_args) = LAYOUT.exec_commands.get(key) {
                     maybe_state = Some(KeyButtonData::Exec {
-                        program: exec_args.first().unwrap().clone(),
+                        program: exec_args
+                            .first()
+                            .expect("Keyboard: Invalid EXEC args")
+                            .clone(),
                         args: exec_args.iter().skip(1).cloned().collect(),
                     });
                 } else {

src/overlays/screen.rs

@@ -481,9 +481,10 @@ where
         let token = pw_token_store.get(display_name).map(|s| s.as_str());
 
         if let Some(t) = token {
-            println!(
+            log::info!(
                 "Found existing Pipewire token for display {}: {}",
-                display_name, t
+                display_name,
+                t
             );
         }
 
@@ -495,7 +496,7 @@ where
                     .insert(String::from(display_name), token.clone())
                     .is_none()
                 {
-                    println!("Adding Pipewire token {}", token);
+                    log::info!("Adding Pipewire token {}", token);
                 }
             }
         }