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

playwright.config.js

@@ -0,0 +1,43 @@
+const { defineConfig } = require('@playwright/test');
+const setup = require('./tests/ui/global-setup');
+
+// Before anything else, including the servers below.
+setup.prepare();
+
+// Real browser against a real daemon. The stub-DOM smoke test catches a script that
+// fails to load; it cannot catch a wrong selector, a handler that runs but does nothing,
+// or a page that renders empty -- which is exactly what has slipped through before.
+module.exports = defineConfig({
+  testDir: './tests/ui',
+  timeout: 30_000,
+  expect: { timeout: 10_000 },
+  fullyParallel: false,        // one daemon, one database
+  workers: 1,
+  reporter: process.env.CI ? 'line' : [['list']],
+  use: {
+    baseURL: 'http://127.0.0.1:8791',
+    trace: 'retain-on-failure',
+    screenshot: 'only-on-failure',
+  },
+  webServer: [
+    {
+      command: 'node tests/ui/fixtures/serve.js',
+      port: 8792,
+      reuseExistingServer: false,
+      stdout: 'ignore',
+    },
+    {
+      // Build first so the tests always run against current source.
+      command: 'cargo build -q && exec ./target/debug/ipx daemon',
+      port: 8791,
+      reuseExistingServer: false,
+      timeout: 180_000,
+      stdout: 'pipe',
+      env: {
+        IPX_CONFIG: `${setup.root}/config/config.toml`,
+        IPX_DATA_DIR: `${setup.root}/data`,
+        IPX_LOG: 'ipx=info',
+      },
+    },
+  ],
+});