feat(ui): close the friends kebab on an outside tap

A slid-open friend row now collapses when the user taps anywhere outside its
action buttons (taps on a kebab are skipped so its own toggle still drives the
open/close). Uses the same capture-phase window pointerdown idiom as Screen,
active only while a row is revealed.

ui/src/screens/Friends.svelte

@@ -80,6 +80,19 @@
     if (target) void remove(target.accountId);
   }
 
+  // While a friend row is slid open, a tap anywhere outside its action buttons
+  // closes it again. Taps on a kebab are skipped so its own toggle stays in charge.
+  $effect(() => {
+    if (revealedId === null) return;
+    function onDown(e: PointerEvent) {
+      const el = e.target as Element | null;
+      if (el?.closest('.acts') || el?.closest('.kebab')) return;
+      revealedId = null;
+    }
+    window.addEventListener('pointerdown', onDown, true);
+    return () => window.removeEventListener('pointerdown', onDown, true);
+  });
+
   async function getCode() {
     try {
       code = await gateway.friendCodeIssue();