feat(web): add delete-for-all action for groups in chat info

web/src/components/ChatInfoPanel.tsx

@@ -938,6 +938,28 @@ export function ChatInfoPanel({ chatId, open, onClose }: Props) {
 
             {showMembersSection && (chat.type === "group" || chat.type === "channel") ? (
               <>
+                {chat.type === "group" && (myRoleNormalized === "owner" || myRoleNormalized === "admin") ? (
+                  <button
+                    className="mb-2 w-full rounded bg-red-500 px-3 py-2 text-sm font-semibold text-white hover:bg-red-400"
+                    onClick={async () => {
+                      const confirmed = window.confirm("Delete this group for all members?");
+                      if (!confirmed) {
+                        return;
+                      }
+                      try {
+                        await deleteChat(chatId, true);
+                        await loadChats();
+                        setActiveChatId(null);
+                        onClose();
+                      } catch {
+                        setError("Failed to delete group");
+                      }
+                    }}
+                    type="button"
+                  >
+                    Delete group for all
+                  </button>
+                ) : null}
                 {chat.type === "channel" && (myRoleNormalized === "owner" || myRoleNormalized === "admin") ? (
                   <button
                     className="mb-2 w-full rounded bg-red-500 px-3 py-2 text-sm font-semibold text-white hover:bg-red-400"