test(perf): add macOS Tauri WebView performance harness

Drive the production home traffic graph through embedded WebDriver in an
isolated optimized measurement build. Record attributed WebContent and main
process CPU/RSS distributions across foreground, hidden and restored phases.

Keep replay, raw reports, independent-run comparison, cleanup checks and
focused validation available through project commands. Normal release builds
exclude the automation service and measurement entry points.

scripts/perf/tsconfig.node.json

@@ -0,0 +1,10 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "allowJs": true,
+    "checkJs": false,
+    "types": ["node"],
+    "allowImportingTsExtensions": true
+  },
+  "include": ["./*.mjs", "./*.mts"]
+}