add subtle web hover to "View full thread" (#6256)

src/components/SubtleWebHover.tsx

@@ -1,3 +1,5 @@
-export function SubtleWebHover({}: {hover: boolean}) {
+import {ViewStyleProp} from '#/alf'
+
+export function SubtleWebHover({}: ViewStyleProp & {hover: boolean}) {
   return null
 }

src/components/SubtleWebHover.web.tsx

@@ -2,9 +2,12 @@ import React from 'react'
 import {StyleSheet, View} from 'react-native'
 
 import {isTouchDevice} from '#/lib/browser'
-import {useTheme} from '#/alf'
+import {useTheme, ViewStyleProp} from '#/alf'
 
-export function SubtleWebHover({hover}: {hover: boolean}) {
+export function SubtleWebHover({
+  style,
+  hover,
+}: ViewStyleProp & {hover: boolean}) {
   const t = useTheme()
   if (isTouchDevice) {
     return null
@@ -26,9 +29,8 @@ export function SubtleWebHover({hover}: {hover: boolean}) {
       style={[
         t.atoms.bg_contrast_25,
         styles.container,
-        {
-          opacity: hover ? opacity : 0,
-        },
+        {opacity: hover ? opacity : 0},
+        style,
       ]}
     />
   )

src/view/com/posts/FeedSlice.tsx

@@ -7,6 +7,8 @@ import {Trans} from '@lingui/macro'
 import {usePalette} from '#/lib/hooks/usePalette'
 import {makeProfileLink} from '#/lib/routes/links'
 import {FeedPostSlice} from '#/state/queries/post-feed'
+import {useInteractionState} from '#/components/hooks/useInteractionState'
+import {SubtleWebHover} from '#/components/SubtleWebHover'
 import {Link} from '../util/Link'
 import {Text} from '../util/text/Text'
 import {FeedItem} from './FeedItem'
@@ -108,14 +110,30 @@ FeedSlice = memo(FeedSlice)
 export {FeedSlice}
 
 function ViewFullThread({uri}: {uri: string}) {
+  const {
+    state: hover,
+    onIn: onHoverIn,
+    onOut: onHoverOut,
+  } = useInteractionState()
   const pal = usePalette('default')
   const itemHref = React.useMemo(() => {
     const urip = new AtUri(uri)
     return makeProfileLink({did: urip.hostname, handle: ''}, 'post', urip.rkey)
   }, [uri])
 
   return (
-    <Link style={[styles.viewFullThread]} href={itemHref} asAnchor noFeedback>
+    <Link
+      style={[styles.viewFullThread]}
+      href={itemHref}
+      asAnchor
+      noFeedback
+      onPointerEnter={onHoverIn}
+      onPointerLeave={onHoverOut}>
+      <SubtleWebHover
+        hover={hover}
+        // adjust position for visual alignment - the actual box has lots of top padding and not much bottom padding -sfn
+        style={{top: 8, bottom: -5}}
+      />
       <View style={styles.viewFullThreadDots}>
         <Svg width="4" height="40">
           <Line