feat: implement custom smart context functionality with hooks, IPC handlers, and utilities

- Added custom hooks for managing smart context metadata and snippets.
- Implemented IPC handlers for retrieving context, upserting snippets, and updating summaries.
- Created utility functions for reading and writing smart context data to the filesystem.
- Established a structured custom code organization under src/custom/ for better maintainability.
- Included a comprehensive update guide to assist with future updates and custom feature integration.

package.json

@@ -70,18 +70,18 @@
     "@typescript-eslint/parser": "^5.62.0",
     "@vitest/ui": "^3.1.1",
     "cross-env": "^7.0.3",
-    "drizzle-kit": "^0.30.6",
+    "drizzle-kit": "^0.31.8",
     "electron": "38.2.2",
     "eslint": "^8.57.1",
     "eslint-plugin-import": "^2.31.0",
-    "happy-dom": "^17.4.4",
+    "happy-dom": "^20.0.11",
     "husky": "^9.1.7",
     "lint-staged": "^15.5.2",
     "oxlint": "^1.8.0",
     "prettier": "3.5.3",
     "rimraf": "^6.0.1",
     "typescript": "^5.8.3",
-    "vite": "^5.4.17",
+    "vite": "^7.3.0",
     "vitest": "^3.1.1"
   },
   "dependencies": {