Shared palette for the wizard and installer page

Warm grey text on near-black, amber #c28947, dark brown solid buttons. The
wizard strip no longer labels LEDs before the LED count is known.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.github/workflows/installer.yml

@@ -48,9 +48,10 @@ jobs:
           BUILD_DIR: ${{ steps.build.outputs.name }}
           VERSION: ${{ steps.version.outputs.version }}
         run: |
-          mkdir -p site
+          mkdir -p site/fonts
           cp -r "$BUILD_DIR" site/firmware
           rm -f site/firmware/*.elf
+          cp wizard/fonts/plex-sans.woff2 wizard/fonts/plex-mono-400.woff2 wizard/fonts/OFL.txt site/fonts/
           sed "s/__VERSION__/$VERSION/g" installer/index.html > site/index.html
           ls -R site