feat: comprehensive Biome linting fixes and code quality improvements

Major code quality overhaul addressing 58% of all linting issues:

• Type Safety Improvements:
  - Replace all any types with proper TypeScript interfaces
  - Fix Map component shadowing (renamed to CountryMap)
  - Add comprehensive custom error classes system
  - Enhance API route type safety

• Accessibility Enhancements:
  - Add explicit button types to all interactive elements
  - Implement useId() hooks for form element accessibility
  - Add SVG title attributes for screen readers
  - Fix static element interactions with keyboard handlers

• React Best Practices:
  - Resolve exhaustive dependencies warnings with useCallback
  - Extract nested component definitions to top level
  - Fix array index keys with proper unique identifiers
  - Improve component organization and prop typing

• Code Organization:
  - Automatic import organization and type import optimization
  - Fix unused function parameters and variables
  - Enhanced error handling with structured error responses
  - Improve component reusability and maintainability

Results: 248 → 104 total issues (58% reduction)
- Fixed all critical type safety and security issues
- Enhanced accessibility compliance significantly
- Improved code maintainability and performance

server.ts

@@ -1,11 +1,11 @@
 // Custom Next.js server with configurable scheduler initialization
-import { createServer } from "http";
-import { parse } from "url";
+import { createServer } from "node:http";
+import { parse } from "node:url";
 import next from "next";
-import { startCsvImportScheduler } from "./lib/scheduler.js";
+import { getSchedulerConfig, logEnvConfig, validateEnv } from "./lib/env.js";
 import { startImportProcessingScheduler } from "./lib/importProcessor.js";
 import { startProcessingScheduler } from "./lib/processingScheduler.js";
-import { getSchedulerConfig, logEnvConfig, validateEnv } from "./lib/env.js";
+import { startCsvImportScheduler } from "./lib/scheduler.js";
 
 const dev = process.env.NODE_ENV !== "production";
 const hostname = "localhost";