tegwick a89bb563a0 fix(showcase): break wn-breadcrumb slotchange infinite loop (WHYNOT-WP-0002 T11) ...

WnBreadcrumb._onSlot inserted separator <span>s into its own light DOM on
slotchange but cleaned up in the shadow DOM, so they were never removed — each
insertion re-fired slotchange, looping the main thread and wedging the showcase
page. Made _onSlot idempotent: exclude own separators when reading items, and
mutate only when separators are not already correct.

- Un-fixme the showcase visual test; add a warm-up full-page capture so
  deviceScaleFactor-2 sub-pixel snapping settles before the assertion. All 5
  visual tests pass.
- Remove the dead Google-Fonts @import from colors_and_type.css (token stacks are
  system-ui; webfont unused + a CI-flake source; no visual change).
- Unblocks WHYNOT-WP-0003 T08 (showcase = per-version visual catalog); both T11
  and T08 marked done.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2026-06-27 20:10:41 +02:00

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