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

app/dashboard/layout.tsx

@@ -1,11 +1,12 @@
 "use client";
 
-import { ReactNode, useState, useEffect, useCallback } from "react";
-import { useSession } from "next-auth/react";
 import { useRouter } from "next/navigation";
+import { useSession } from "next-auth/react";
+import { type ReactNode, useCallback, useEffect, useId, useState } from "react";
 import Sidebar from "../../components/Sidebar";
 
 export default function DashboardLayout({ children }: { children: ReactNode }) {
+  const mainContentId = useId();
   const { status } = useSession();
   const router = useRouter();
 
@@ -66,7 +67,7 @@ export default function DashboardLayout({ children }: { children: ReactNode }) {
       />
 
       <main
-        id="main-content"
+        id={mainContentId}
         className={`flex-1 overflow-auto transition-all duration-300 py-4 pr-4
           ${
             isSidebarExpanded