fix(log): compact consecutive repeated diagnostics

Group identical redacted diagnostics across stderr, file and the live ring. Flush repeat summaries on visible transitions, exports and shutdown while keeping periodic counts for sustained bursts.

cx

crates/qbzd/src/daemon.rs

@@ -913,6 +913,7 @@ fn diagnose_lock(e: LockError) -> String {
             eprintln!("error: qbzd is already running {who}");
             eprintln!("  → stop it first:  systemctl --user stop qbzd");
             eprintln!("  → or inspect it:  systemctl --user status qbzd");
+            log::logger().flush();
             std::process::exit(3);
         }
         LockError::Io(msg) => {

crates/qbzd/src/main.rs

@@ -566,6 +566,7 @@ async fn main() {
             tui::run(roots).await
         }
     };
+    log::logger().flush();
     std::process::exit(code);
 }