feat: implement success page and update routing; add lucide icons and enhance form submission feedback

frontend/package-lock.json

@@ -17,7 +17,9 @@
         "@tailwindcss/vite": "^4.1.11",
         "i18next": "^25.7.4",
         "js-cookie": "^3.0.5",
-        "react": "^19.2.0",
+        "lucide": "^0.562.0",
+        "lucide-react": "^0.562.0",
+        "react": "^19.2.3",
         "react-dom": "^19.2.0",
         "react-i18next": "^16.5.3",
         "react-router-dom": "^7.11.0",
@@ -3784,6 +3786,21 @@
         "yallist": "^3.0.2"
       }
     },
+    "node_modules/lucide": {
+      "version": "0.562.0",
+      "resolved": "https://registry.npmjs.org/lucide/-/lucide-0.562.0.tgz",
+      "integrity": "sha512-k1Fb8ZMnRQovWRlea7Jr0b9UKA29IM7/cu79+mJrhVohvA2YC/Ti3Sk+G+h/SIu3IlrKT4RAbWMHUBBQd1O6XA==",
+      "license": "ISC"
+    },
+    "node_modules/lucide-react": {
+      "version": "0.562.0",
+      "resolved": "https://registry.npmjs.org/lucide-react/-/lucide-react-0.562.0.tgz",
+      "integrity": "sha512-82hOAu7y0dbVuFfmO4bYF1XEwYk/mEbM5E+b1jgci/udUBEE/R7LF5Ip0CCEmXe8AybRM8L+04eP+LGZeDvkiw==",
+      "license": "ISC",
+      "peerDependencies": {
+        "react": "^16.5.1 || ^17.0.0 || ^18.0.0 || ^19.0.0"
+      }
+    },
     "node_modules/magic-string": {
       "version": "0.30.21",
       "resolved": "https://registry.npmjs.org/magic-string/-/magic-string-0.30.21.tgz",