Initial commit: Fenix 8 V3 data watch face

- Restore watchface-kit design (500x500, scaled per device)
- 7 themes auto-generated from tokens via gen_themes.py -> Themes.mc
- Four-segment gradient progress ring (22+21 ticks, 4 anchor dots)
- Center time, date band w/ Bluetooth icon, top battery + dual complications, bottom distance/steps
- 17 devices compiled clean (SDK 9.1.0)
- Includes browser/JS preview (preview.html) + 7-theme SVG sheet

source/Fenix8V3App.mc

@@ -0,0 +1,28 @@
+import Toybox.Application;
+import Toybox.Lang;
+import Toybox.WatchUi;
+
+class Fenix8V3App extends Application.AppBase {
+
+    function initialize() {
+        AppBase.initialize();
+    }
+
+    function onStart(state as Dictionary?) as Void {
+    }
+
+    function onStop(state as Dictionary?) as Void {
+    }
+
+    function getInitialView() as [Views] or [Views, InputDelegates] {
+        return [new Fenix8V3View()];
+    }
+
+    function onSettingsChanged() as Void {
+        WatchUi.requestUpdate();
+    }
+}
+
+function getApp() as Fenix8V3App {
+    return Application.getApp() as Fenix8V3App;
+}