Show Windows privacy hints in launcher

The launcher sentence around the room name was replaced
by a standalone instruction ("meetingText"); the room name
now sits on its own line below it.

Windows users additionally get camera/microphone
permission instructions in the launcher view. The block
reuses the existing i18n/OS detection and only appears
when translations loaded, so a failed i18n.json fetch
cannot render an empty box.

assets/css/launch.css

@@ -206,7 +206,18 @@ button, .button {
   background: #f5f5f5;
 }
 
+/* Long text needs left alignment, the card is centered */
+.privacy {
+  margin-top: 24px;
+  padding: 20px;
+  border-radius: 8px;
+  background: #f5f5f5;
+  text-align: left;
+}
+
 .room {
+  display: block;
+  margin-top: 20px;
   font-family: monospace;
   word-break: break-all;
 }
@@ -465,7 +476,8 @@ button, .button {
 }
 
 :root.dark .status,
-:root.dark .download {
+:root.dark .download,
+:root.dark .privacy {
   background: #303030;
 }