v2.0.31

release: v2.0.31 — Homebridge UI plugin tile now shows the new icon

v2.0.30 bundled icon.png inside the homebridge-dibby-wemo tarball, but
Homebridge UI v5+ doesn't read images from the tarball -- it looks for
an explicit 'icon' URL in the plugin's package.json, and otherwise
falls back to the default house icon (which is what users were seeing).

Three coordinated changes in packages/homebridge-plugin:

1. package.json adds a top-level 'icon' field pointing at the raw-GitHub
   URL of the bundled icon.png.  Homebridge UI's plugin-tile renderer
   reads this directly from npm registry metadata, so the new icon
   appears on every Plugins page after the next metadata refresh.

2. package.json adds displayName: 'Dibby Wemo' so the tile shows the
   clean brand name instead of the auto-derived 'Homebridge Dibby Wemo'.

3. config.schema.json's headerDisplay now leads with a 96px centred icon
   image plus the existing description so the Configure dialog also
   shows the brand mark.

Functional code unchanged.  Unified version bump only across the other
8 packages.