Invite friends: wire followers banner to find-friends settings, polish

- Add promo banner illustration (assets/images/invite_friends_promo_banner.webp)
  and replace the empty placeholder box in FollowersPromoBanner.
- Redirect the followers empty-state banner to the Find and Invite Friends
  settings screen instead of opening the share sheet, gated to mirror that
  screen's availability (native, geolocation allowlist, feature flag) so we
  don't promote contact import where the settings entry is hidden.
- Drop the now-dead invite dialog mount/control from ProfileFollowers and
  update the banner a11y copy to match the new destination.
- Scanner: collapse the unused error-message state to a boolean (the overlay
  renders its own localized copy).

src/features/inviteFriends/InviteScannerScreen.tsx

@@ -25,7 +25,7 @@ export function InviteScannerScreen() {
   const insets = useSafeAreaInsets()
   const navigation = useNavigation<NavigationProp>()
   const [permission, requestPermission] = useCameraPermissions()
-  const [error, setError] = useState<string | null>(null)
+  const [showError, setShowError] = useState(false)
   const [scannerEnabled, setScannerEnabled] = useState(true)
 
   const onClose = useCallback(() => {
@@ -44,13 +44,7 @@ export function InviteScannerScreen() {
       )
       if (!profileMatch) {
         setScannerEnabled(false)
-        setError(
-          l({
-            message: 'Profile not found',
-            comment:
-              'Error shown when a scanned QR code is not a valid Bluesky profile URL',
-          }),
-        )
+        setShowError(true)
         return
       }
 
@@ -58,11 +52,11 @@ export function InviteScannerScreen() {
       const handle = profileMatch[1]
       navigation.replace('Profile', {name: handle})
     },
-    [scannerEnabled, navigation, l],
+    [scannerEnabled, navigation],
   )
 
   const onRetry = useCallback(() => {
-    setError(null)
+    setShowError(false)
     setScannerEnabled(true)
   }, [])
 
@@ -165,7 +159,7 @@ export function InviteScannerScreen() {
       </View>
 
       {/* Error overlay shown when scanned QR isn't a valid profile URL */}
-      {error && (
+      {showError && (
         <View
           style={{
             position: 'absolute',

src/features/inviteFriends/components/FollowersPromoBanner.tsx

@@ -1,4 +1,5 @@
 import {Pressable, View} from 'react-native'
+import {Image} from 'expo-image'
 import {useLingui} from '@lingui/react/macro'
 
 import {atoms as a, useTheme} from '#/alf'
@@ -18,8 +19,8 @@ export function FollowersPromoBanner({
     <View style={[a.px_lg, a.pt_md]}>
       <Pressable
         accessibilityRole="button"
-        accessibilityLabel={l`Invite friends`}
-        accessibilityHint={l`Opens the invite friends sheet to share your profile`}
+        accessibilityLabel={l`Find and invite friends`}
+        accessibilityHint={l`Opens the find and invite friends settings`}
         onPress={onPress}
         style={({pressed}) => [
           a.flex_row,
@@ -34,14 +35,11 @@ export function FollowersPromoBanner({
             opacity: pressed ? 0.85 : 1,
           },
         ]}>
-        <View
-          style={{
-            width: 126,
-            height: 64,
-            marginRight: 16,
-            alignItems: 'center',
-            justifyContent: 'center',
-          }}
+        <Image
+          accessibilityIgnoresInvertColors
+          source={require('../../../../assets/images/invite_friends_promo_banner.webp')}
+          style={{width: 126, height: 64, marginRight: 16}}
+          contentFit="contain"
         />
         <Text
           style={[