Add Playwright test infrastructure for wxWidgets WASM port

- Add tests/ directory with Playwright e2e tests
- Add minimal wxWidgets WASM test application
- Add build script for test app (scripts/build-wasm-test.sh)
- Update wxWidgets submodule with WASM build fixes
- Update .gitignore for test artifacts

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

scripts/build-wasm-test.sh

@@ -0,0 +1,58 @@
+#!/bin/bash
+# Build the minimal wxWidgets WASM test application
+# This script creates library symlinks and builds the test app
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(dirname "$SCRIPT_DIR")"
+BUILD_DIR="$PROJECT_ROOT/build-wasm/wxwidgets-universal"
+TESTS_DIR="$PROJECT_ROOT/tests"
+WASM_APP_DIR="$TESTS_DIR/wasm-app"
+
+echo "=== Building wxWidgets WASM Test Application ==="
+echo "Project root: $PROJECT_ROOT"
+echo "wxWidgets build: $BUILD_DIR"
+echo "Test app dir: $WASM_APP_DIR"
+
+# Verify wxWidgets is built
+if [ ! -f "$BUILD_DIR/wx-config" ]; then
+    echo "ERROR: wxWidgets not built. Run build-wxuniversal-wasm.sh first"
+    exit 1
+fi
+
+# Create library symlinks
+# wx-config outputs paths like libwx_baseu-3.2.a but files are named libwx_baseu-3.2-emscripten.a
+echo ""
+echo "=== Creating library symlinks ==="
+cd "$BUILD_DIR/lib"
+for f in libwx_*-emscripten.a; do
+    if [ -f "$f" ]; then
+        link="${f%-emscripten.a}.a"
+        if [ ! -e "$link" ]; then
+            ln -s "$f" "$link"
+            echo "Created: $link -> $f"
+        fi
+    fi
+done
+
+# Build the test app
+echo ""
+echo "=== Building test application ==="
+cd "$WASM_APP_DIR"
+
+# Clean any previous build
+make -f Makefile.wasm clean 2>/dev/null || true
+
+# Build
+make -f Makefile.wasm
+
+echo ""
+echo "=== Build complete ==="
+ls -lh "$WASM_APP_DIR"/minimal_test.* 2>/dev/null
+
+echo ""
+echo "To run the tests:"
+echo "  cd $TESTS_DIR"
+echo "  npm install"
+echo "  npm test"