feat: highlight search matches and document the working UI

tools/desktop-capture/package.json

@@ -0,0 +1,13 @@
+{
+  "name": "searchi-desktop-capture",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "capture": "node capture.mjs",
+    "install-browser": "playwright install chromium --only-shell"
+  },
+  "dependencies": {
+    "playwright": "1.64.0"
+  }
+}