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

server.ts

@@ -2,10 +2,10 @@
 import { createServer } from "node:http";
 import { parse } from "node:url";
 import next from "next";
-import { getSchedulerConfig, logEnvConfig, validateEnv } from "./lib/env.js";
-import { startImportProcessingScheduler } from "./lib/importProcessor.js";
-import { startProcessingScheduler } from "./lib/processingScheduler.js";
-import { startCsvImportScheduler } from "./lib/scheduler.js";
+import { getSchedulerConfig, logEnvConfig, validateEnv } from "./lib/env";
+import { startImportProcessingScheduler } from "./lib/importProcessor";
+import { startProcessingScheduler } from "./lib/processingScheduler";
+import { startCsvImportScheduler } from "./lib/scheduler";
 
 const dev = process.env.NODE_ENV !== "production";
 const hostname = "localhost";