Fix invisible bidi characters copied with handles on web

src/components/ProfileCard.tsx

@@ -29,6 +29,7 @@ import {
   type TextStyleProp,
   useTheme,
   type ViewStyleProp,
+  web,
 } from '#/alf'
 import {
   Button,
@@ -257,6 +258,7 @@ function InlineNameAndHandle({
           a.leading_tight,
           a.flex_shrink_0,
           {maxWidth: '70%'},
+          web({direction: 'ltr', unicodeBidi: 'isolate'}),
         ]}
         numberOfLines={1}>
         {forceLTR(name)}

src/lib/strings/__tests__/bidi.test.ts

@@ -0,0 +1,33 @@
+import {describe, expect, it, jest} from '@jest/globals'
+
+/*
+ * bidi.ts reads IS_WEB at call time, so a getter lets each test pick the
+ * platform. The mock-prefixed name is required by jest's factory scope rule.
+ */
+let mockIsWeb = false
+jest.mock('#/env', () => ({
+  get IS_WEB() {
+    return mockIsWeb
+  },
+}))
+
+import {forceLTR} from '../bidi'
+
+const LEFT_TO_RIGHT_EMBEDDING = '\u202A'
+const POP_DIRECTIONAL_FORMATTING = '\u202C'
+
+describe('forceLTR', () => {
+  it('wraps the string in directional formatting characters on native', () => {
+    mockIsWeb = false
+    expect(forceLTR('@alice.bsky.social')).toBe(
+      LEFT_TO_RIGHT_EMBEDDING +
+        '@alice.bsky.social' +
+        POP_DIRECTIONAL_FORMATTING,
+    )
+  })
+
+  it('returns the string unchanged on web so copied text stays clean (#8451)', () => {
+    mockIsWeb = true
+    expect(forceLTR('@alice.bsky.social')).toBe('@alice.bsky.social')
+  })
+})

src/lib/strings/bidi.ts

@@ -1,10 +1,19 @@
+import {IS_WEB} from '#/env'
+
 const LEFT_TO_RIGHT_EMBEDDING = '\u202A'
 const POP_DIRECTIONAL_FORMATTING = '\u202C'
 
 /*
  * Force LTR directionality in a string.
  * https://www.unicode.org/reports/tr9/#Directional_Formatting_Characters
+ *
+ * On web, direction is isolated with CSS instead (direction: ltr + unicode-bidi:
+ * isolate on the surrounding Text), so these invisible control characters are not
+ * injected. Injecting them leaks the characters into the rendered text, where
+ * they end up in copy-paste and break handle lookups in other apps and tools
+ * (#8451). Native has no equivalent CSS, so the manual wrapping is kept there.
  */
 export function forceLTR(str: string) {
+  if (IS_WEB) return str
   return LEFT_TO_RIGHT_EMBEDDING + str + POP_DIRECTIONAL_FORMATTING
 }

src/view/com/notifications/NotificationFeedItem.tsx

@@ -44,7 +44,7 @@ import {Post} from '#/view/com/post/Post'
 import {formatCount} from '#/view/com/util/numeric/format'
 import {TimeElapsed} from '#/view/com/util/TimeElapsed'
 import {PreviewableUserAvatar} from '#/view/com/util/UserAvatar'
-import {atoms as a, platform, useTheme} from '#/alf'
+import {atoms as a, platform, useTheme, web} from '#/alf'
 import {Button, ButtonIcon, ButtonText} from '#/components/Button'
 import {BellRinging_Filled_Corner0_Rounded as BellRingingIcon} from '#/components/icons/BellRinging'
 import {Check_Stroke2_Corner0_Rounded as CheckIcon} from '#/components/icons/Check'
@@ -243,7 +243,13 @@ let NotificationFeedItem = ({
     <ProfileHoverCard did={firstAuthor.profile.did} inline>
       <InlineLinkText
         key={firstAuthor.href}
-        style={[t.atoms.text, a.font_semi_bold, a.text_md, a.leading_tight]}
+        style={[
+          t.atoms.text,
+          a.font_semi_bold,
+          a.text_md,
+          a.leading_tight,
+          web({direction: 'ltr', unicodeBidi: 'isolate'}),
+        ]}
         to={firstAuthor.href}
         disableMismatchWarning
         emoji

src/view/com/util/PostMeta.tsx

@@ -99,6 +99,7 @@ let PostMeta = (opts: PostMetaOpts): React.ReactNode => {
                 a.leading_tight,
                 a.flex_shrink_0,
                 {maxWidth: '70%'},
+                web({direction: 'ltr', unicodeBidi: 'isolate'}),
               ]}>
               {forceLTR(
                 sanitizeDisplayName(