The client now handles being suppressed correctly (#16)

I noticed our BRB and AFK rooms were borked and made a change to fix that. I've attached a photo showing the result.

Overview:

- Add suppress field to UserState struct
- Process suppress field from UserState protobuf messages
- Update UI to show suppressed users with blacked out styling and muted icon
- Disable mute toggle button when user is suppressed

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Reviewed-on: #16

gui/src/lib.rs

@@ -404,6 +404,9 @@ fn accept_packet(
             if u.has_deaf() {
                 state.deaf = u.get_deaf();
             }
+            if u.has_suppress() {
+                state.suppress = u.get_suppress();
+            }
             if u.has_self_mute() {
                 state.self_mute = u.get_self_mute();
             }