UPDATE: Backgroud setting, Remake ui/ux

frontend/package-lock.json

@@ -16,6 +16,7 @@
         "path-browserify": "^1.0.1",
         "react": "^19.1.1",
         "react-dom": "^19.1.1",
+        "react-easy-crop": "^5.5.3",
         "react-toastify": "^11.0.5",
         "tailwindcss": "^4.1.14",
         "zustand": "^5.0.8"
@@ -3783,6 +3784,12 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/normalize-wheel": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/normalize-wheel/-/normalize-wheel-1.0.1.tgz",
+      "integrity": "sha512-1OnlAPZ3zgrk8B91HyRj+eVv+kS5u+Z0SCsak6Xil/kmgEia50ga7zfkumayonZrImffAxPU/5WcyGhzetHNPA==",
+      "license": "BSD-3-Clause"
+    },
     "node_modules/optionator": {
       "version": "0.9.4",
       "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.9.4.tgz",
@@ -4000,6 +4007,20 @@
         "react": "^19.2.0"
       }
     },
+    "node_modules/react-easy-crop": {
+      "version": "5.5.3",
+      "resolved": "https://registry.npmjs.org/react-easy-crop/-/react-easy-crop-5.5.3.tgz",
+      "integrity": "sha512-iKwFTnAsq+IVuyF6N0Q3zjRx9DG1NMySkwWxVfM/xAOeHYH1vhvM+V2kFiq5HOIQGWouITjfltCx54mbDpMpmA==",
+      "license": "MIT",
+      "dependencies": {
+        "normalize-wheel": "^1.0.1",
+        "tslib": "^2.0.1"
+      },
+      "peerDependencies": {
+        "react": ">=16.4.0",
+        "react-dom": ">=16.4.0"
+      }
+    },
     "node_modules/react-refresh": {
       "version": "0.17.0",
       "resolved": "https://registry.npmjs.org/react-refresh/-/react-refresh-0.17.0.tgz",