Bump partial refresh to 80ms, add retry to catch HA state syncs

display_partial() drops calls when the e-paper is still busy, which
silently lost HA-triggered widget updates (e.g. fan speed) that landed
during the previous refresh's busy window. The retry fires once the
busy window has cleared so the state-synced state makes it to the panel.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

waveshare-test.yaml

@@ -159,7 +159,12 @@ script:
   - id: refresh_display
     mode: restart
     then:
-      - delay: 60ms
+      - delay: 80ms
+      - lambda: 'id(display0).display_partial();'
+      # Retry once the e-paper's busy window has cleared, to catch HA-synced
+      # widget updates that landed while the first partial refresh was in flight
+      # (display_partial drops calls when busy).
+      - delay: 350ms
       - lambda: 'id(display0).display_partial();'
   - id: full_refresh_display
     mode: restart