Fix Gif Select dialog search bar scrolling away (#8874)

* fix flatlist dialogs on web

* tweak gif select dialog, add style prop to textfield

src/components/Dialog/index.web.tsx

@@ -193,7 +193,7 @@ export function Inner({
           onInteractOutside={preventDefault}
           onFocusOutside={preventDefault}
           onDismiss={close}
-          style={{display: 'flex', flexDirection: 'column'}}>
+          style={{height: '100%', display: 'flex', flexDirection: 'column'}}>
           {header}
           <View style={[gtMobile ? a.p_2xl : a.p_xl, contentContainerStyle]}>
             {children}
@@ -227,10 +227,10 @@ export const InnerFlatList = React.forwardRef<
         web({maxHeight: '80vh'}),
         webInnerStyle,
       ]}
-      contentContainerStyle={[a.px_0, webInnerContentContainerStyle]}>
+      contentContainerStyle={[a.h_full, a.px_0, webInnerContentContainerStyle]}>
       <FlatList
         ref={ref}
-        style={[gtMobile ? a.px_2xl : a.px_xl, flatten(style)]}
+        style={[a.h_full, gtMobile ? a.px_2xl : a.px_xl, flatten(style)]}
         {...props}
       />
     </Inner>

src/components/Dialog/shared.tsx

@@ -5,7 +5,6 @@ import {
   View,
   type ViewStyle,
 } from 'react-native'
-import type React from 'react'
 
 import {atoms as a, useTheme} from '#/alf'
 import {Text} from '#/components/Typography'
@@ -28,6 +27,8 @@ export function Header({
     <View
       onLayout={onLayout}
       style={[
+        a.sticky,
+        a.top_0,
         a.relative,
         a.w_full,
         a.py_sm,
@@ -61,7 +62,7 @@ export function HeaderText({
   style?: StyleProp<TextStyle>
 }) {
   return (
-    <Text style={[a.text_lg, a.text_center, a.font_bold, style]}>
+    <Text style={[a.text_lg, a.text_center, a.font_heavy, style]}>
       {children}
     </Text>
   )