Add TrueCV logo and update site branding

- Add logo to navbar, home hero, login and register pages
- Update color scheme to match logo blue (#2B5F9E)
- Add CSS variables for consistent brand colors
- Improve card hover transitions with shadow effects
- Add responsive content padding
- Add focus-visible states for accessibility
- Add active state styling for navigation links

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/TrueCV.Web/Components/Pages/Account/Login.razor

@@ -16,9 +16,7 @@
             <div class="card border-0 shadow">
                 <div class="card-body p-5">
                     <div class="text-center mb-4">
-                        <svg xmlns="http://www.w3.org/2000/svg" width="48" height="48" fill="currentColor" class="bi bi-patch-check-fill text-primary mb-3" viewBox="0 0 16 16">
-                            <path d="M10.067.87a2.89 2.89 0 0 0-4.134 0l-.622.638-.89-.011a2.89 2.89 0 0 0-2.924 2.924l.01.89-.636.622a2.89 2.89 0 0 0 0 4.134l.637.622-.011.89a2.89 2.89 0 0 0 2.924 2.924l.89-.01.622.636a2.89 2.89 0 0 0 4.134 0l.622-.637.89.011a2.89 2.89 0 0 0 2.924-2.924l-.01-.89.636-.622a2.89 2.89 0 0 0 0-4.134l-.637-.622.011-.89a2.89 2.89 0 0 0-2.924-2.924l-.89.01-.622-.636zm.287 5.984-3 3a.5.5 0 0 1-.708 0l-1.5-1.5a.5.5 0 1 1 .708-.708L7 8.793l2.646-2.647a.5.5 0 0 1 .708.708z"/>
-                        </svg>
+                        <img src="/images/TrueCV_Logo.png" alt="TrueCV" class="mb-3" style="height: 60px;" />
                         <h3 class="fw-bold">Welcome Back</h3>
                         <p class="text-muted">Sign in to your TrueCV account</p>
                     </div>