chore: update dependencies and add Cloudflare support

- Updated dependencies in package.json for Astro, React, and testing libraries.
- Added .assetsignore to exclude specific files from asset uploads.
- Refactored AccountSummary, MainContent, and Sidebar components for clarity and maintainability.
- Enhanced tsconfig.json to support React JSX syntax.
- Created wrangler.jsonc for Cloudflare Workers configuration.

package.json

@@ -11,12 +11,19 @@
     "test:coverage": "vitest run --coverage"
   },
   "dependencies": {
-    "astro": "^5.7.5"
+    "@astrojs/cloudflare": "^12.5.1",
+    "@astrojs/react": "^4.2.5",
+    "@types/react": "^19.1.2",
+    "@types/react-dom": "^19.1.2",
+    "astro": "^5.7.5",
+    "react": "^19.1.0",
+    "react-dom": "^19.1.0"
   },
   "devDependencies": {
-    "@types/supertest": "^2.0.12",
-    "@vitest/coverage-v8": "^0.34.6",
-    "supertest": "^6.3.3",
-    "vitest": "^0.34.3"
+    "@types/supertest": "^6.0.3",
+    "@vitest/coverage-v8": "^3.1.2",
+    "supertest": "^7.1.0",
+    "vitest": "^3.1.2",
+    "wrangler": "^4.13.1"
   }
 }