feat: Update HTML `title` on web #626 #599 (#655)

For any `Screen` that shows on desktop, `title` is "(1) ... - Bluesky"
where "(1)" is the unread notification count.

The titles are unlocalized and the string "Bluesky" is hardcoded,
following the pattern of the rest of the app.

Display names and post content are loaded into the title as effects.

Tested:
* all screens
* screen changes / component mounts/unmounts
* long posts with links and images
* display name set/unset
* spamming myself with notifications, clearing notifications
* /profile/did:... links
* lint (only my changed files), jest, e2e.

New utilities: `useUnreadCountLabel`, `bskyTitle`,
`combinedDisplayName`, `useSetTitle`.

resolves: #626 #599

src/Navigation.tsx

···
 import {useColorSchemeStyle} from 'lib/hooks/useColorSchemeStyle'
 import {router} from './routes'
 import {usePalette} from 'lib/hooks/usePalette'
+import {useUnreadCountLabel} from 'lib/hooks/useUnreadCountLabel'
 import {useStores} from './state'
 
 import {HomeScreen} from './view/screens/Home'
···
 import {ModerationMutedAccounts} from 'view/screens/ModerationMutedAccounts'
 import {ModerationBlockedAccounts} from 'view/screens/ModerationBlockedAccounts'
 import {getRoutingInstrumentation} from 'lib/sentry'
+import {bskyTitle} from 'lib/strings/headings'
 
 const navigationRef = createNavigationContainerRef<AllNavigatorParams>()
 
···
 /**
  * These "common screens" are reused across stacks.
  */
-function commonScreens(Stack: typeof HomeTab) {
+function commonScreens(Stack: typeof HomeTab, unreadCountLabel?: string) {
+  const title = (page: string) => bskyTitle(page, unreadCountLabel)
+
   return (
     <>
-      <Stack.Screen name="NotFound" component={NotFoundScreen} />
-      <Stack.Screen name="Moderation" component={ModerationScreen} />
+      <Stack.Screen
+        name="NotFound"
+        component={NotFoundScreen}
+        options={{title: title('Not Found')}}
+      />
+      <Stack.Screen
+        name="Moderation"
+        component={ModerationScreen}
+        options={{title: title('Moderation')}}
+      />
       <Stack.Screen
         name="ModerationMuteLists"
         component={ModerationMuteListsScreen}
+        options={{title: title('Mute Lists')}}
       />
       <Stack.Screen
         name="ModerationMutedAccounts"
         component={ModerationMutedAccounts}
+        options={{title: title('Muted Accounts')}}
       />
       <Stack.Screen
         name="ModerationBlockedAccounts"
         component={ModerationBlockedAccounts}
+        options={{title: title('Blocked Accounts')}}
+      />
+      <Stack.Screen
+        name="Settings"
+        component={SettingsScreen}
+        options={{title: title('Settings')}}
       />
-      <Stack.Screen name="Settings" component={SettingsScreen} />
-      <Stack.Screen name="Profile" component={ProfileScreen} />
+      <Stack.Screen
+        name="Profile"
+        component={ProfileScreen}
+        options={({route}) => ({title: title(`@${route.params.name}`)})}
+      />
       <Stack.Screen
         name="ProfileFollowers"
         component={ProfileFollowersScreen}
+        options={({route}) => ({
+          title: title(`People following @${route.params.name}`),
+        })}
       />
-      <Stack.Screen name="ProfileFollows" component={ProfileFollowsScreen} />
-      <Stack.Screen name="ProfileList" component={ProfileListScreen} />
-      <Stack.Screen name="PostThread" component={PostThreadScreen} />
-      <Stack.Screen name="PostLikedBy" component={PostLikedByScreen} />
-      <Stack.Screen name="PostRepostedBy" component={PostRepostedByScreen} />
-      <Stack.Screen name="Debug" component={DebugScreen} />
-      <Stack.Screen name="Log" component={LogScreen} />
-      <Stack.Screen name="Support" component={SupportScreen} />
-      <Stack.Screen name="PrivacyPolicy" component={PrivacyPolicyScreen} />
-      <Stack.Screen name="TermsOfService" component={TermsOfServiceScreen} />
+      <Stack.Screen
+        name="ProfileFollows"
+        component={ProfileFollowsScreen}
+        options={({route}) => ({
+          title: title(`People followed by @${route.params.name}`),
+        })}
+      />
+      <Stack.Screen
+        name="ProfileList"
+        component={ProfileListScreen}
+        options={{title: title('Mute List')}}
+      />
+      <Stack.Screen
+        name="PostThread"
+        component={PostThreadScreen}
+        options={({route}) => ({title: title(`Post by @${route.params.name}`)})}
+      />
+      <Stack.Screen
+        name="PostLikedBy"
+        component={PostLikedByScreen}
+        options={({route}) => ({title: title(`Post by @${route.params.name}`)})}
+      />
+      <Stack.Screen
+        name="PostRepostedBy"
+        component={PostRepostedByScreen}
+        options={({route}) => ({title: title(`Post by @${route.params.name}`)})}
+      />
+      <Stack.Screen
+        name="Debug"
+        component={DebugScreen}
+        options={{title: title('Debug')}}
+      />
+      <Stack.Screen
+        name="Log"
+        component={LogScreen}
+        options={{title: title('Log')}}
+      />
+      <Stack.Screen
+        name="Support"
+        component={SupportScreen}
+        options={{title: title('Support')}}
+      />
+      <Stack.Screen
+        name="PrivacyPolicy"
+        component={PrivacyPolicyScreen}
+        options={{title: title('Privacy Policy')}}
+      />
+      <Stack.Screen
+        name="TermsOfService"
+        component={TermsOfServiceScreen}
+        options={{title: title('Terms of Service')}}
+      />
       <Stack.Screen
         name="CommunityGuidelines"
         component={CommunityGuidelinesScreen}
+        options={{title: title('Community Guidelines')}}
       />
-      <Stack.Screen name="CopyrightPolicy" component={CopyrightPolicyScreen} />
-      <Stack.Screen name="AppPasswords" component={AppPasswords} />
+      <Stack.Screen
+        name="CopyrightPolicy"
+        component={CopyrightPolicyScreen}
+        options={{title: title('Copyright Policy')}}
+      />
+      <Stack.Screen
+        name="AppPasswords"
+        component={AppPasswords}
+        options={{title: title('App Passwords')}}
+      />
     </>
   )
 }
···
  */
 function FlatNavigator() {
   const pal = usePalette('default')
+  const unreadCountLabel = useUnreadCountLabel()
+  const title = (page: string) => bskyTitle(page, unreadCountLabel)
   return (
     <Flat.Navigator
       screenOptions={{
···
         animationDuration: 250,
         contentStyle: [pal.view],
       }}>
-      <Flat.Screen name="Home" component={HomeScreen} />
-      <Flat.Screen name="Search" component={SearchScreen} />
-      <Flat.Screen name="Notifications" component={NotificationsScreen} />
-      {commonScreens(Flat as typeof HomeTab)}
+      <Flat.Screen
+        name="Home"
+        component={HomeScreen}
+        options={{title: title('Home')}}
+      />
+      <Flat.Screen
+        name="Search"
+        component={SearchScreen}
+        options={{title: title('Search')}}
+      />
+      <Flat.Screen
+        name="Notifications"
+        component={NotificationsScreen}
+        options={{title: title('Notifications')}}
+      />
+      {commonScreens(Flat as typeof HomeTab, unreadCountLabel)}
     </Flat.Navigator>
   )
 }

src/lib/hooks/useSetTitle.ts

···
+import {useEffect} from 'react'
+import {useNavigation} from '@react-navigation/native'
+
+import {NavigationProp} from 'lib/routes/types'
+import {bskyTitle} from 'lib/strings/headings'
+import {useUnreadCountLabel} from './useUnreadCountLabel'
+
+export function useSetTitle(title?: string) {
+  const navigation = useNavigation<NavigationProp>()
+  const unreadCountLabel = useUnreadCountLabel()
+  useEffect(() => {
+    if (title) {
+      navigation.setOptions({title: bskyTitle(title, unreadCountLabel)})
+    }
+  }, [title, navigation, unreadCountLabel])
+}

src/lib/hooks/useUnreadCountLabel.ts

···
+import {useEffect, useReducer} from 'react'
+import {DeviceEventEmitter} from 'react-native'
+import {useStores} from 'state/index'
+
+export function useUnreadCountLabel() {
+  // HACK: We don't have anything like Redux selectors,
+  // and we don't want to use <RootStoreContext.Consumer />
+  // to react to the whole store
+  const [, forceUpdate] = useReducer(x => x + 1, 0)
+  useEffect(() => {
+    const subscription = DeviceEventEmitter.addListener(
+      'unread-notifications',
+      forceUpdate,
+    )
+    return () => subscription?.remove()
+  }, [forceUpdate])
+
+  return useStores().me.notifications.unreadCountLabel
+}

src/lib/strings/display-names.ts

···
   }
   return ''
 }
+
+export function combinedDisplayName({
+  handle,
+  displayName,
+}: {
+  handle?: string
+  displayName?: string
+}): string {
+  if (!handle) {
+    return ''
+  }
+  return displayName
+    ? `${sanitizeDisplayName(displayName)} (@${handle})`
+    : `@${handle}`
+}

src/lib/strings/headings.ts

···
+export function bskyTitle(page: string, unreadCountLabel?: string) {
+  const unreadPrefix = unreadCountLabel ? `(${unreadCountLabel}) ` : ''
+  return `${unreadPrefix}${page} - Bluesky`
+}

src/view/com/post-thread/PostThread.tsx

···
 import {s} from 'lib/styles'
 import {isDesktopWeb, isMobileWeb} from 'platform/detection'
 import {usePalette} from 'lib/hooks/usePalette'
+import {useSetTitle} from 'lib/hooks/useSetTitle'
 import {useNavigation} from '@react-navigation/native'
 import {NavigationProp} from 'lib/routes/types'
+import {sanitizeDisplayName} from 'lib/strings/display-names'
 
 const REPLY_PROMPT = {_reactKey: '__reply__', _isHighlightedPost: false}
 const DELETED = {_reactKey: '__deleted__', _isHighlightedPost: false}
···
     }
     return []
   }, [view.thread])
+  useSetTitle(
+    view.thread?.postRecord &&
+      `${sanitizeDisplayName(
+        view.thread.post.author.displayName ||
+          `@${view.thread.post.author.handle}`,
+      )}: "${view.thread?.postRecord?.text}"`,
+  )
 
   // events
   // =

src/view/screens/Profile.tsx

···
 import {s, colors} from 'lib/styles'
 import {useAnalytics} from 'lib/analytics'
 import {ComposeIcon2} from 'lib/icons'
+import {useSetTitle} from 'lib/hooks/useSetTitle'
+import {combinedDisplayName} from 'lib/strings/display-names'
 
 type Props = NativeStackScreenProps<CommonNavigatorParams, 'Profile'>
 export const ProfileScreen = withAuthRequired(
···
       () => new ProfileUiModel(store, {user: route.params.name}),
       [route.params.name, store],
     )
+    useSetTitle(combinedDisplayName(uiState.profile))
 
     useFocusEffect(
       React.useCallback(() => {

src/view/screens/ProfileList.tsx

···
 import {ListModel} from 'state/models/content/list'
 import {useStores} from 'state/index'
 import {usePalette} from 'lib/hooks/usePalette'
+import {useSetTitle} from 'lib/hooks/useSetTitle'
 import {NavigationProp} from 'lib/routes/types'
 import {isDesktopWeb} from 'platform/detection'
 
···
       )
       return model
     }, [store, name, rkey])
+    useSetTitle(list.list?.name)
 
     useFocusEffect(
       React.useCallback(() => {