Enforce coverage %.

vite.config.ts

@@ -6,6 +6,14 @@ export default defineConfig({
     coverage: {
       // Favor istanbul for coverage over v8 due to better accuracy.
       provider: 'istanbul',
+
+      // Thresholds will automatically be updated as coverage improves to avoid
+      // back-sliding.
+      thresholdAutoUpdate: true,
+      statements: 71.65,
+      branches: 60.62,
+      functions: 72.78,
+      lines: 71.54,
     },
   },
 });