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

package.json

@@ -0,0 +1,13 @@
+{
+  "name": "ipx-ui-tests",
+  "private": true,
+  "description": "Browser tests for the ipx web UI. The Rust tests cover the server; these cover the page.",
+  "scripts": {
+    "test": "playwright test",
+    "test:headed": "playwright test --headed",
+    "smoke": "node tests/page-smoke.js"
+  },
+  "devDependencies": {
+    "@playwright/test": "^1.56.0"
+  }
+}