Add D.RANGE toggle chip to LIGHT tab; letterbox camera polaroid to 3:4 card

src/components/Viewfinder.tsx

@@ -395,14 +395,18 @@ export default function Viewfinder({
     return { dx: (vw - dw) / 2, dy: (vh - dh) / 2, dw, dh };
   }, [skiaImage, vw, vh]);
   // Polaroid card geometry (JS/overlay space) for the CURRENT mode. Library
-  // stills keep the photo aspect; camera previews use the screen aspect (the
-  // feed fills the screen, so the card overlays it in view coordinates).
+  // stills keep the photo aspect; the camera assumes the upright capture
+  // aspect of the photo output (4:3 sensor → 3:4 portrait), NOT the screen
+  // aspect: a screen-aspect window made the card nearly fullscreen and
+  // pole-like, whereas the real print is a shorter 3:4 card letterboxed on
+  // screen. ponytail: verified on Xiaomi quality-mode captures (4:3); if the
+  // session negotiates 16:9 photos, change to 9/16.
   const polaroidGeo = useMemo(() => {
     if (selectedFrame !== 'polaroid') return null;
     const aspect =
       mode === 'library' && skiaImage && skiaImage.width() > 0 && skiaImage.height() > 0
         ? skiaImage.width() / skiaImage.height()
-        : vw / vh;
+        : 3 / 4;
     return polaroidLayout(vw, vh, aspect, 'contain');
   }, [selectedFrame, mode, skiaImage, vw, vh]);
   const onLibTouchStart = (e: any) => {