feat(exif): stamp RC_<ts> filenames + EXIF on capture and export

App.tsx

@@ -934,6 +934,7 @@ export default function App() {
           }
         }
 
+        const capturedAt = Date.now(); // EXIF DateTimeOriginal / file name
         const { filePath } = await photoOutput.capturePhotoToFile({ enableShutterSound: shutterSound === 'on' }, {});
         const sourceUri = toUri(filePath);
 
@@ -974,6 +975,10 @@ export default function App() {
             useGeotag,
           };
           const options = {
+            // Live capture: gallery name RC_<yyyymmdd_hhmmss>.jpg and the
+            // shutter instant as the EXIF capture date.
+            exported: false,
+            capturedAt,
             // 300dpi header + full-res screen sharpen. No evFromCamera: the camera
             // AE bias is never written, so the export applies the same software EV
             // gain the preview shows.
@@ -1072,6 +1077,9 @@ export default function App() {
           // the photo as seen (own aspect), polaroid/wall keep their ratio crop.
           {
             aspect: libraryAspect,
+            // Library export: RC_<ts>_exported.jpg, and the loaded photo's
+            // EXIF (camera, dates, GPS) is carried into the file.
+            exported: true,
             watermark: wmForExport(),
             watermarkRotation: wmRotation,
             gpsWatermark: gpsWm,
@@ -1093,6 +1101,9 @@ export default function App() {
           // the photo as seen (own aspect), polaroid/wall keep their ratio crop.
           {
             aspect: libraryAspect,
+            // Library export: RC_<ts>_exported.jpg, and the loaded photo's
+            // EXIF (camera, dates, GPS) is carried into the file.
+            exported: true,
             watermark: wmForExport(),
             watermarkRotation: wmRotation,
             gpsWatermark: gpsWm,