Remove notification system and fix data refresh issues

- Removed NotificationPanel component and related files
- Removed notifications API endpoint and utils
- Fixed data refresh functionality with cache-busting
- Added refreshing state with better UI feedback
- Added no-cache headers to API endpoint
- Improved refresh button with loading state

app/api/availability/route.ts

@@ -1,5 +1,9 @@
 import { NextResponse } from 'next/server';
 
+// Force dynamic rendering to prevent caching
+export const dynamic = 'force-dynamic';
+export const revalidate = 0;
+
 // Library branch locations with approximate coordinates
 const LIBRARY_LOCATIONS: Record<string, { lat: number; lng: number }> = {
   'Beckwourth': { lat: 32.7157, lng: -117.1611 },
@@ -127,10 +131,17 @@ export async function GET() {
 
     const locations = Array.from(locationMap.values());
     
-    return NextResponse.json({
+    const response = NextResponse.json({
       locations,
       lastUpdated: new Date().toISOString(),
     });
+    
+    // Prevent caching to ensure fresh data
+    response.headers.set('Cache-Control', 'no-cache, no-store, must-revalidate');
+    response.headers.set('Pragma', 'no-cache');
+    response.headers.set('Expires', '0');
+    
+    return response;
   } catch (error) {
     console.error('Error in API route:', error);
     return NextResponse.json(