feat(frontend): add flag-icons dependency

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

package-lock.json

@@ -16,6 +16,7 @@
         "express": "^5.2.1",
         "express-rate-limit": "^8.6.1",
         "file-type": "^22.0.1",
+        "flag-icons": "^7.5.0",
         "fonteditor-core": "^2.6.3",
         "fontkit": "^2.0.4",
         "heic-convert": "^2.1.0",
@@ -3398,6 +3399,12 @@
         "url": "https://opencollective.com/express"
       }
     },
+    "node_modules/flag-icons": {
+      "version": "7.5.0",
+      "resolved": "https://registry.npmjs.org/flag-icons/-/flag-icons-7.5.0.tgz",
+      "integrity": "sha512-kd+MNXviFIg5hijH766tt+3x76ele1AXlo4zDdCxIvqWZhKt4T83bOtxUOOMlTx/EcFdUMH5yvQgYlFh1EqqFg==",
+      "license": "MIT"
+    },
     "node_modules/follow-redirects": {
       "version": "1.16.0",
       "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.16.0.tgz",