Added onboarding + a lightweight install banner to both the mobile login screen and the settings screen, with Android/Chromium

install prompt support and iOS “Share → Add to Home Screen” guidance. Also added a small helper + tests to decide
  when/which banner variant should show, and shared copy in common.json.

resources/js/admin/mobile/EventPhotosPage.tsx

@@ -744,9 +744,20 @@ export default function MobileEventPhotosPage() {
       ) : photos.length === 0 ? (
         <MobileCard alignItems="center" justifyContent="center" space="$2">
           <ImageIcon size={28} color={muted} />
-          <Text fontSize="$sm" color={muted}>
-            {t('mobilePhotos.empty', 'No photos found.')}
+          <Text fontSize="$sm" fontWeight="700" color={text}>
+            {t('mobilePhotos.emptyTitle', 'No uploads yet')}
           </Text>
+          <Text fontSize="$xs" color={muted} textAlign="center">
+            {t('mobilePhotos.emptyBody', 'Share the QR code so guests can start uploading photos.')}
+          </Text>
+          {slug ? (
+            <CTAButton
+              label={t('mobilePhotos.emptyAction', 'Share QR code')}
+              tone="ghost"
+              fullWidth={false}
+              onPress={() => navigate(adminPath(`/mobile/events/${slug}/qr`))}
+            />
+          ) : null}
         </MobileCard>
       ) : (
         <YStack space="$3">