Log tabs with a daemon I/O view, and Playwright UI tests

The log view splits into All / Daemon I/O / Scans / HTTP. Daemon I/O is
the control protocol itself, logged where every command funnels through
so it covers socket clients, the CLI and the web UI alike. stderr and the
in-app buffer now have separate filters, so the UI can keep debug detail
the terminal should not carry.

Playwright drives a real browser against a daemon on fixture feeds. Eight
tests, each mapping to a bug that reached a user -- the Rust tests and the
stub-DOM smoke test cannot see a wrong selector or a dead handler.

It immediately found one: OPML folders rendered expanded by default,
because the code stored closed groups, so any folder never toggled counted
as open.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AdXho5tTkjFLeUXKbEjKBh

src/ipc.rs

@@ -149,6 +149,15 @@ impl Emitter {
         }
 
         if let Some(tx) = &self.tx {
+            // The outbound half of the protocol, as it goes on the wire. Progress is the
+            // high-volume one, so it sits at debug.
+            if let Ok(json) = serde_json::to_string(&e) {
+                if matches!(e, Event::Progress { .. }) {
+                    tracing::debug!(target: "ipx::io", "<- {json}");
+                } else {
+                    tracing::info!(target: "ipx::io", "<- {json}");
+                }
+            }
             // An error here only means nobody is listening yet.
             let _ = tx.send(e.clone());
         }