移除 MUI 依赖，简化配置文件，重写 ThemeModeProvider

package.json

@@ -24,10 +24,6 @@
     "@dnd-kit/core": "^6.3.1",
     "@dnd-kit/sortable": "^10.0.0",
     "@dnd-kit/utilities": "^3.2.2",
-    "@emotion/react": "^11.14.0",
-    "@emotion/styled": "^11.14.1",
-    "@mui/icons-material": "^9.0.1",
-    "@mui/material": "^9.0.1",
     "@radix-ui/react-dialog": "^1.1.15",
     "@radix-ui/react-slot": "^1.2.4",
     "@testing-library/dom": "^10.4.1",