fix: improve API error handling, add fallback UI, and optimize Nginx connection settings

resources/views/currency.blade.php

@@ -1,3 +1,4 @@
+@if($rate)
 <div class="card">
 <div class="title">
     
@@ -5,10 +6,10 @@
     
     {{$currencyName}}
     </p>
-    <p class="percent" style="color: {{ $rate['Change'] > 0 ? 'green' : '#B9101E' }}">
-        {{ $rate['Change'] }}%
+    <p class="percent" style="color: {{ ($rate['Change'] ?? 0) > 0 ? 'green' : '#B9101E' }}">
+        {{ $rate['Change'] ?? 0 }}%
     </p>
-    @if($rate['Change'] > 0)
+    @if(($rate['Change'] ?? 0) > 0)
         <svg width="20" height="20" fill="green" style="position: relative; top: -2px;" viewBox="0 0 1792 1792" xmlns="http://www.w3.org/2000/svg" transform="rotate(180)"> <path d="M384 576q0-26 19-45t45-19h896q26 0 45 19t19 45-19 45l-448 448q-19 19-45 19t-45-19l-448-448q-19-19-19-45z"></path> </svg> 
     @else
         <svg width="20" height="20" fill="#B9101E" viewBox="0 0 1792 1792" xmlns="http://www.w3.org/2000/svg"> <path d="M384 576q0-26 19-45t45-19h896q26 0 45 19t19 45-19 45l-448 448q-19 19-45 19t-45-19l-448-448q-19-19-19-45z"></path> </svg> 
@@ -19,12 +20,13 @@
 <div class="data">
     <p>
    
-        {{$rate['Selling']}} ₺
+        {{$rate['Selling'] ?? '0.00'}} ₺
     </p>
     
     <div class="range">
-        <div class="fill" style="background-color: {{ $rate['Change'] > 0 ? 'green' : '#B9101E' }};">
+        <div class="fill" style="background-color: {{ ($rate['Change'] ?? 0) > 0 ? 'green' : '#B9101E' }};">
         </div>
     </div>
 </div>
-</div>
+</div>
+@endif