fix: use proper Blazor syntax for NavLink href with dynamic value

Changed NavLink href from "/blog/@Post.Id" to @($"/blog/{Post.Id}")
to fix compilation error. NavLink component attributes require proper
Blazor syntax for dynamic values, not HTML-style @ interpolation.

Error was: "Component attributes do not support complex content"

Co-Authored-By: Claude Sonnet 4.5 <[email protected]>

Author: JerrettDavis

JdhPro.Web/Components/Blog/PostCard.razor

@@ -1,7 +1,7 @@
 @using JdhPro.Web.Models
 
 <article class="tech-card bg-gray-900 border-@AccentColor/30 p-6 hover:border-@AccentColor/60 transition-all duration-300 group">
-    <NavLink href="/blog/@Post.Id" class="block space-y-4">
+    <NavLink href="@($"/blog/{Post.Id}")" class="block space-y-4">
 
         @* Header with date and source indicator *@
         <div class="flex items-center justify-between gap-3">