SUNDIAL solar dial v0.3: round screen, NOAA solar math, day/night arc

- 466px round layout, designWidth 466 (S4 41mm 466x466)
- solar position + dayProgress in src/common/solar.js (pure, TDD'd)
- sunrise/sunset sweep, night moon, countdown, 30s refresh
- tests: solar math, page logic, circle geometry/contrast

src/app.ux

@@ -0,0 +1,10 @@
+<script>
+export default {
+  onCreate() {
+    console.log('Hello Vela app created')
+  },
+  onDestroy() {
+    console.log('Hello Vela app destroyed')
+  }
+}
+</script>