fix: comprehensive TypeScript/build fixes and modernization

- Update tsconfig to ES2024 target and bundler moduleResolution
- Add dynamic imports for chart.js and recharts (bundle optimization)
- Consolidate 17 useState into useReducer in sessions page
- Fix 18 .js extension imports across lib files
- Add type declarations for @rapideditor/country-coder
- Fix platform user types (PlatformUserRole enum)
- Fix Calendar component prop types
- Centralize next-auth type augmentation
- Add force-dynamic to all API routes (prevent build-time prerender)
- Fix Prisma JSON null handling with Prisma.DbNull
- Fix various type mismatches (SessionMessage, ImportRecord, etc.)
- Export ButtonProps from button component
- Update next-themes import path
- Replace JSX.Element with React.ReactElement
- Remove obsolete debug scripts and pnpm lockfile
- Downgrade eslint to v8 for next compatibility

eslint.config.js

@@ -1,41 +0,0 @@
-import nextTypescript from "eslint-config-next/typescript";
-import nextCoreWebVitals from "eslint-config-next/core-web-vitals";
-import path from "node:path";
-import { fileURLToPath } from "node:url";
-import { FlatCompat } from "@eslint/eslintrc";
-import js from "@eslint/js";
-
-const __filename = fileURLToPath(import.meta.url);
-const __dirname = path.dirname(__filename);
-const compat = new FlatCompat({
-  baseDirectory: __dirname,
-});
-
-const eslintConfig = [
-  ...nextTypescript,
-  js.configs.recommended,
-  ...nextCoreWebVitals,
-  ...compat.extends("plugin:@typescript-eslint/recommended"),
-  {
-    ignores: [
-      "node_modules/",
-      ".next/",
-      ".vscode/",
-      "out/",
-      "build/",
-      "dist/",
-      "coverage/",
-    ],
-    rules: {
-      "@typescript-eslint/no-explicit-any": "warn",
-      "@typescript-eslint/no-unused-vars": "warn",
-      "react/no-unescaped-entities": "warn",
-      "no-console": "off",
-      "no-trailing-spaces": "warn",
-      "prefer-const": "error",
-      "no-unused-vars": "warn",
-    },
-  }
-];
-
-export default eslintConfig;