initial commit

Features/Root/NotFound/NotFoundPage.razor

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+@page "/not-found"
+@using Microsoft.AspNetCore.Mvc
+@layout MainLayout
+@attribute [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
+
+<MudContainer MaxWidth="MaxWidth.Medium" Class="d-flex align-center justify-center" Style="height: calc(100vh - 64px);">
+
+    <div class="text-center">
+
+        <MudIcon Icon="@Icons.Material.Filled.ErrorOutline"
+                 Size="Size.Large"
+                 Color="Color.Error"
+                 Class="mb-6" Style="font-size: 120px;" />
+
+        <MudText Typo="Typo.h3" Class="mb-4">Page Not Found (404)</MudText>
+
+        <MudText Typo="Typo.body1" Class="mb-6 text-muted">
+            Sorry, the page you are looking for is unavailable or has been moved.
+            <br />
+            Please double-check the URL or return to the home page.
+        </MudText>
+
+        <MudButton Variant="Variant.Filled"
+                   Color="Color.Primary"
+                   Size="Size.Large"
+                   Href="/"
+                   StartIcon="@Icons.Material.Filled.Home">
+            Back to Home
+        </MudButton>
+
+    </div>
+
+</MudContainer>