Keep relayed matches through short link loss; stop browser polling in a lobby

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/net/src/client/runtime.rs

@@ -1203,7 +1203,8 @@ pub const BACKLOG_STALL_MS: i32 = 1000;
 /// How many stalls the link may take before the session is failed for real. A
 /// hitch costs one and is recovered from; an authority that has genuinely gone
 /// away keeps earning them and fails once they add up.
-pub const BACKLOG_STALLS_BEFORE_FAIL: u32 = 3;
+pub const BACKLOG_STALLS_BEFORE_FAIL: u32 =
+    (master_protocol::SESSION_IDLE.as_millis() / BACKLOG_STALL_MS as u128) as u32 - 1;
 
 #[derive(Debug, Default)]
 pub struct BacklogStalls {

crates/net/src/transport/master.rs

@@ -840,12 +840,15 @@ fn arm_master_browser(
     browser: Option<Res<MasterBrowser>>,
     mut commands: Commands,
 ) {
+    let MasterLaunchMode::Browser(browser_config) = &intent.0 else {
+        if browser.is_some() {
+            commands.remove_resource::<MasterBrowser>();
+        }
+        return;
+    };
     if browser.is_some() {
         return;
     }
-    let MasterLaunchMode::Browser(browser_config) = &intent.0 else {
-        return;
-    };
     let state = Arc::new(Mutex::new(MasterBrowserSnapshot {
         loading: true,
         have: browser_config.have,