fix(chat): hide profile hover card when username is clicked (#29444)

Clicking a hovered username navigates to the profile, but the pending
debounced show (200ms) and DelayedMounting (300ms) timers were never
cancelled, so the card could pop up on top of the profile page after
navigation. Hide on mousedown on the anchor text; clicks inside the
portaled card (follow/chat buttons) still work.

Author: chrisnojima

shared/common-adapters/profile-card.tsx

@@ -302,6 +302,14 @@ export const WithProfileCardPopup = ({username, children, ellipsisStyle}: WithPr
       style={Styles.collapseStyles([styles.popupTextContainer, ellipsisStyle])}
       onMouseOver={onShow}
       onMouseLeave={onHide}
+      onMouseDown={e => {
+        // clicking the username navigates to the profile; cancel any pending/visible popup.
+        // portal children bubble through the React tree, so only hide when the click is on
+        // the anchor itself and not inside the floating card (follow/chat buttons).
+        // loose typing since tsconfig.native compiles this file without DOM lib
+        const anchor = e.currentTarget as unknown as {contains?: (t: unknown) => boolean}
+        if (anchor.contains?.(e.target)) onHide()
+      }}
       ref={popupAnchor}
     >
       {children()}