General cleanup and refactoring

lib/constants/strings.dart

@@ -0,0 +1,17 @@
+const String aboutText = "OpenHIIT is a free and open-source interval timer.";
+
+const String intervalTimerTitle = "Interval Timer";
+const String intervalTimerDescription =
+    "Create an interval timer that alternates between work and rest periods. Includes options for warm-up, cool-down, and more.";
+const String workoutTitle = "Workout";
+const String workoutDescription =
+    "Create a workout that lets you define exercises with an interval timer.";
+const String importTitle = "Import";
+const String importDescription =
+    "Import a workout or timer from a file on your device.";
+
+const String noSavedTimers = "No saved timers";
+const String noSavedTimersDescription =
+    "Hit the + at the bottom to get started!";
+const String fetchingTimers = "Fetching timers...";
+const String exportingFiles = "Exporting file(s)";

lib/pages/create_timer/create_timer.dart

@@ -20,11 +20,7 @@ class CreateTimerState extends State<CreateTimer> {
   Widget build(BuildContext context) {
     final formKey = GlobalKey<FormState>();
 
-    /// Submit and form, save the workout values, and move
-    /// to the next view.
-    ///
     void submitForm(TimerType timer) {
-      // Validate returns true if the form is valid, or false otherwise.
       final form = formKey.currentState!;
       if (form.validate()) {
         form.save();
@@ -38,7 +34,6 @@ class CreateTimerState extends State<CreateTimer> {
         );
       }
     }
-    // ---
 
     return Scaffold(
         appBar: AppBar(