release: 0.6.4

Wire-compatible refinement release (GOSSIP_PROTO stays 5). Highlights:
honest chat send status + sender-side pacing (chat-hardening Phase 5),
completing the chat-hardening plan; playlist drawer de-clutter + auto-resize;
plus the FEC-gap and network-restart fixes already on the branch.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Cargo.lock

@@ -4871,7 +4871,7 @@ checksum = "35fb2e5f958ec131621fdd531e9fc186ed768cbe395337403ae56c17a74c68ec"
 
 [[package]]
 name = "peerspeak"
-version = "0.6.3"
+version = "0.6.4"
 dependencies = [
  "anyhow",
  "async-trait",