feat: frontend remote relay, kiosk hardening, CSS compositor fix

Frontend:
- Add remote-relay.ts: receives companion input via /ws/remote-relay,
  dispatches keyboard/mouse/scroll events into browser DOM
- Add CompanionIndicator.vue: NES gamepad icon when companion connected
- Wire relay start/stop to auth state in App.vue

Kiosk:
- Move Chromium data dir to /var/lib/archipelago/chromium-kiosk (encrypted)
- Disable MetricsReporting, AutofillServerCommunication, PasswordManager
- Remove --metrics-recording-only (contradicts disable-metrics)

CSS:
- Fix Chromium ghost rectangles: only apply preserve-3d + backface-visibility
  during transitions, not always-on (causes Chromium to skip painting
  off-viewport cards)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

image-recipe/configs/archipelago-kiosk-launcher.sh

@@ -33,7 +33,7 @@ while true; do
       --disable-translate \
       --no-first-run \
       --check-for-update-interval=31536000 \
-      --disable-features=TranslateUI \
+      --disable-features=TranslateUI,MetricsReporting,AutofillServerCommunication,PasswordManagerEnabled \
       --disable-session-crashed-bubble \
       --disable-save-password-bubble \
       --disable-suggestions-service \
@@ -50,10 +50,9 @@ while true; do
       --disable-breakpad \
       --disable-metrics \
       --disable-metrics-reporting \
-      --metrics-recording-only \
       --disable-domain-reliability \
       --js-flags="--max-old-space-size=128" \
-      --user-data-dir=/home/archipelago/.config/chromium-kiosk
+      --user-data-dir=/var/lib/archipelago/chromium-kiosk
     sleep 3
 done