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

types/next-auth.d.ts

@@ -0,0 +1,43 @@
+import type { PlatformUserRole, UserRole } from "@prisma/client";
+import "next-auth";
+import "next-auth/jwt";
+
+declare module "next-auth/jwt" {
+  interface JWT {
+    // Company user fields
+    companyId?: string;
+    role?: UserRole;
+    // Platform user fields
+    isPlatformUser?: boolean;
+    platformRole?: PlatformUserRole;
+  }
+}
+
+declare module "next-auth" {
+  interface Session {
+    user: {
+      id?: string;
+      email?: string;
+      name?: string | null;
+      image?: string | null;
+      // Company user fields
+      companyId?: string;
+      role?: UserRole;
+      // Platform user fields
+      isPlatformUser?: boolean;
+      platformRole?: PlatformUserRole;
+    };
+  }
+
+  interface User {
+    id: string;
+    email: string;
+    name?: string | null;
+    // Company user fields
+    companyId?: string;
+    role?: UserRole;
+    // Platform user fields
+    isPlatformUser?: boolean;
+    platformRole?: PlatformUserRole;
+  }
+}