feat(wasm-dom): Phase 7 — KiCad pcbnew builds and runs on the DOM port

Pipeline: lexer generation (pcbcommon) ordered before the embind
pre-compile — a fresh-build-tree chicken-and-egg any new volume would
hit (generated pcb_lexer.h was included via -I${KICAD_BUILD}/common
before anything generated it). DOM flavor outputs flow through the
host-mounted output/dom/. pcbnew e2e on DOM: editor loads fully (layer
manager, toolbars, WebGL viewport, registry metrics), draw-lines test
passes; the header pixel-reference assertion fails as expected (native
DOM styling vs univ pixels) — port-aware references pending.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/scripts/setup-kicad-wasm.sh

@@ -15,7 +15,7 @@ PROJECT_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
 # WX_PORT=dom into output-dom/) from tests/apps-dom/kicad.
 if [ "${WX_PORT:-}" = "dom" ]; then
     KICAD_TEST="$PROJECT_ROOT/tests/apps-dom/kicad"
-    OUTPUT_DIR="$PROJECT_ROOT/output-dom"
+    OUTPUT_DIR="$PROJECT_ROOT/output/dom"
     KICAD_BUILD_SUFFIX="-dom"
 else
     KICAD_TEST="$PROJECT_ROOT/tests/apps/kicad"