feat: hide slide button if there is no slide

Author: dada878

app/(website)/(pages)/_components/SessionPopup.tsx

@@ -179,15 +179,18 @@ const SessionPopup = ({ openSessionId }: { openSessionId: string | null }) => {
                       >
                         即時提問
                       </button>
-                      <button
-                        onClick={() => {
-                          if (session.slide)
-                            window.open(session.slide, "_blank");
-                        }}
-                        className="flex-grow text-nowrap rounded-full bg-[#B9D3E6] px-3 py-2 text-center text-[16px] font-bold transition-colors hover:bg-[#A1C7E0]"
-                      >
-                        簡報連結
-                      </button>
+                      {session.slide && (
+                        <button
+                          onClick={() => {
+                            if (session.slide)
+                              window.open(session.slide, "_blank");
+                          }}
+                          className="flex-grow text-nowrap rounded-full bg-[#B9D3E6] px-3 py-2 text-center text-[16px] font-bold transition-colors hover:bg-[#A1C7E0]"
+                        >
+                          簡報連結
+                        </button>
+                      )}
+
                       <button
                         onClick={() => {
                           if (session.co_write)