Fix alt text selection in lightbox on both platforms

Move the tap-to-expand handlers from the wrapping Pressable onto the
selectable Text itself. Text selection is driven by the native text
view's long-press (RN Text on Android, UITextView on iOS); a parent
touchable consumes that long-press before the selectable node can begin
a selection, which broke selection entirely on Android.

This restores the pre-#10330 structure so the same native node owns both
the tap-to-expand and the long-press-to-select. The earlier #10654 fix
only addressed iOS (its UITextView selection recognizer coexists with
the parent Pressable); Android needs the handlers on the Text node.

src/components/Lightbox/chrome/Footer.tsx

@@ -1,11 +1,5 @@
 import {useRef} from 'react'
-import {
-  LayoutAnimation,
-  Pressable,
-  ScrollView,
-  StyleSheet,
-  View,
-} from 'react-native'
+import {LayoutAnimation, ScrollView, StyleSheet, View} from 'react-native'
 import {useSafeAreaInsets} from 'react-native-safe-area-context'
 import {useLingui} from '@lingui/react/macro'
 
@@ -46,26 +40,41 @@ export function Footer({altText, isAltExpanded, onToggleAltExpanded}: Props) {
             isMomentumScrolling.current = false
           }}
           contentContainerStyle={[a.px_md, a.py_sm]}>
-          <Pressable
+          <View
             accessibilityRole="button"
             accessibilityLabel={l`Expand alt text`}
-            accessibilityHint=""
-            onPress={() => {
-              if (isMomentumScrolling.current) return
-              LayoutAnimation.configureNext({
-                duration: 450,
-                update: {type: 'spring', springDamping: 1},
-              })
-              onToggleAltExpanded()
-            }}>
+            accessibilityHint="">
+            {/*
+             * The press handlers must live on the Text itself, not on a
+             * wrapping Pressable. Text selection is driven by the platform's
+             * native text view long-press (RN Text on Android, UITextView on
+             * iOS). A parent touchable consumes that long-press before the
+             * selectable Text can begin a selection - on Android this prevents
+             * selection entirely. Keeping onPress/onLongPress on the Text lets
+             * the same native node own both the tap-to-expand and the
+             * long-press-to-select. The empty onLongPress is intentional: it
+             * reserves the long-press for the OS selection gesture instead of
+             * firing the expand toggle. RN exposes no API to arbitrate tap vs
+             * native selection on a single node, so this is the supported
+             * workaround, and it behaves consistently on both platforms.
+             */}
             <Text
               emoji
               selectable
               style={[a.text_sm, {color: t.palette.white}]}
-              numberOfLines={isAltExpanded ? undefined : 3}>
+              numberOfLines={isAltExpanded ? undefined : 3}
+              onPress={() => {
+                if (isMomentumScrolling.current) return
+                LayoutAnimation.configureNext({
+                  duration: 450,
+                  update: {type: 'spring', springDamping: 1},
+                })
+                onToggleAltExpanded()
+              }}
+              onLongPress={() => {}}>
               {altText}
             </Text>
-          </Pressable>
+          </View>
         </ScrollView>
       </View>
     </View>