fix(deps): add missing @element-plus/icons-vue dependency

Was installed as a transitive dependency previously but not declared
in package.json. After a clean reinstall the build failed with
'Rollup failed to resolve import @element-plus/icons-vue'.

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

frontend/package.json

@@ -11,20 +11,21 @@
     "format": "prettier --write src/"
   },
   "dependencies": {
-    "vue": "^3.5.0",
-    "vue-router": "^4.4.0",
+    "@element-plus/icons-vue": "^2.3.2",
     "axios": "^1.7.0",
-    "marked": "^15.0.0",
+    "echarts": "^5.5.0",
     "element-plus": "^2.9.0",
-    "echarts": "^5.5.0"
+    "marked": "^15.0.0",
+    "vue": "^3.5.0",
+    "vue-router": "^4.4.0"
   },
   "devDependencies": {
     "@vitejs/plugin-vue": "^5.2.0",
-    "vite": "^6.0.0",
-    "typescript": "^5.7.0",
-    "vue-tsc": "^2.2.0",
-    "eslint": "^9.0.0",
     "@vue/eslint-config-typescript": "^14.0.0",
-    "prettier": "^3.4.0"
+    "eslint": "^9.0.0",
+    "prettier": "^3.4.0",
+    "typescript": "^5.7.0",
+    "vite": "^6.0.0",
+    "vue-tsc": "^2.2.0"
   }
 }

frontend/pnpm-lock.yaml

@@ -8,6 +8,9 @@ importers:
 
   .:
     dependencies:
+      '@element-plus/icons-vue':
+        specifier: ^2.3.2
+        version: 2.3.2(vue@3.5.38(typescript@5.9.3))
       axios:
         specifier: ^1.7.0
         version: 1.18.0