chore: set FORCE_COLOR=1 in test env for realistic ANSI output

Tests must exercise the same ANSI code paths users see. Without
FORCE_COLOR, chalk disables all color in non-TTY test environments,
making style bugs invisible to the test suite.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/runtime-tests/vite.config.ts

@@ -3,6 +3,10 @@ import vueJsx from "@vitejs/plugin-vue-jsx";
 
 export default defineConfig({
   plugins: [vueJsx()],
+  test: {
+    // chalk disables color in non-TTY envs; force it on so ANSI style bugs don't hide from tests
+    env: { FORCE_COLOR: "1" },
+  },
   lint: {
     options: { typeAware: true, typeCheck: true },
   },