Doobie v0.13.1

Added

• Diagnostic banner at the top of the WebView (auto-hides as soon as
  React mounts). When the UI fails to load on a user's machine the
  banner stays visible and ticks off the stages we got past
  (HTML → juce bridge → React → Babel → App mounted), plus shows any
  uncaught JS error. Makes Linux WebKit-related bugs reportable
  without needing the user to open dev tools.

Documentation

• Linux runtime dependencies spelled out in the README's Install
  section: libwebkit2gtk-4.0-37 libgtk-3-0 libglib2.0-0 libsoup2.4-1 libasound2 libjack-jackd2-0 plus the WebKitGTK 4.0 vs 4.1
  compatibility note for Ubuntu 24.04+. A Linux user reported a
  white-window-after-install on 0.13.0; this is the documentation half
  of the fix.