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

docker-compose.yml

@@ -1,8 +1,8 @@
 services:
-  ipx:
+  iPodderX:
     build: .
     # image: ipx:latest        # swap build: for image: once you have published one
-    container_name: ipx
+    container_name: iPodderX
     restart: unless-stopped
     environment:
       # Unraid shares expect these; downloads land owned by nobody:users.