refactor(ui): toast bileşeninde reactive store kullan

client/src/components/Toast.svelte

@@ -2,16 +2,6 @@
   import { toast } from '../stores/toastStore.js';
   import { fade } from 'svelte/transition';
 
-  let toastData = {
-    message: null,
-    type: 'success',
-    visible: false
-  };
-
-  toast.subscribe(value => {
-    toastData = value;
-  });
-
   const icons = {
     success: 'fa-solid fa-circle-check',
     error: 'fa-solid fa-circle-exclamation',
@@ -19,11 +9,11 @@
   };
 </script>
 
-{#if toastData.visible && toastData.message}
+{#if $toast.visible && $toast.message}
   <div class="toast-container" transition:fade={{ duration: 200 }}>
-    <div class="toast {toastData.type}">
-      <i class="{icons[toastData.type] || icons.info}"></i>
-      <span>{toastData.message}</span>
+    <div class="toast {$toast.type}">
+      <i class="{icons[$toast.type] || icons.info}"></i>
+      <span>{$toast.message}</span>
     </div>
   </div>
 {/if}