bump hbb_common: name the family a WebRTC session runs over

`stream_type` reaches the UI as the transport that won the race, and every other transport
already carries the family in that label - the v6 punch reports `IPv6`. WebRTC does not: one
label covers both families, and it is the one path whose real remote address can differ from
the rendezvous-observed one the session is identified by.

Refine it at the hand-off to the UI rather than at the source: five sites in client.rs
compare `typ == "WebRTC"`, so widening the label there would silently move control flow.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019UzcMTdYTEv2QbMHcTSUy3

src/client/io_loop.rs

@@ -185,6 +185,14 @@ impl<T: InvokeUiSession> Remote<T> {
                     .unwrap()
                     .set_connected();
                 let is_secured = peer.is_secured();
+                // Only WebRTC needs refining: its label names the transport that won the race,
+                // not the family ICE ended up nominating, and it is the one path where the two
+                // can disagree with the address the rendezvous observed.
+                let stream_type = if peer.webrtc_remote_ipv6().await.unwrap_or(false) {
+                    "WebRTC/IPv6"
+                } else {
+                    stream_type
+                };
                 self.handler
                     .set_connection_type(is_secured, direct, stream_type); // flutter -> connection_ready
                 if !is_secured