feat: Update login panel icons and styles for improved visual consistency

Author: stephanebouget

src/app/shared/components/login-panel/login-panel.component.html

@@ -1,6 +1,6 @@
 <div class="login-panel">
   <div class="login-content">
-    <div class="login-icon">🔐</div>
+    <i class="login-icon ti ti-shield-lock"></i>
     <h2>Welcome to GitHub Security Alerts</h2>
     <p>Enter your GitHub Personal Access Token to monitor security alerts.</p>
     <p class="hint">
@@ -12,7 +12,7 @@ <h2>Welcome to GitHub Security Alerts</h2>
       (click)="onOpenTokenPage()"
       title="Open GitHub token creation page"
     >
-      🔑 Create Token on GitHub
+      <i class="ti ti-key"></i> Create Token on GitHub
     </button>
     <div class="token-input-group">
       <input
@@ -28,7 +28,7 @@ <h2>Welcome to GitHub Security Alerts</h2>
         [disabled]="authLoading || !tokenInput.trim()"
       >
         <span *ngIf="!authLoading">Connect</span>
-        <span *ngIf="authLoading">⏳ Connecting...</span>
+        <span *ngIf="authLoading"><i class="ti ti-loader spinning"></i> Connecting...</span>
       </button>
     </div>
     <p class="error-text" *ngIf="error">{{ error }}</p>

src/app/shared/components/login-panel/login-panel.component.scss

@@ -27,8 +27,9 @@ $border-color: #2a2a4a;
     text-align: center;
 
     .login-icon {
-      font-size: 48px;
+      font-size: 56px;
       margin-bottom: 16px;
+      color: #4a90d9;
     }
 
     h2 {
@@ -80,6 +81,11 @@ $border-color: #2a2a4a;
     transition: all 0.2s;
     margin: 0 auto 16px;
 
+    i {
+      font-size: 16px;
+      color: #4a90d9;
+    }
+
     &:hover {
       background: color.adjust($bg-tertiary, $lightness: 5%);
       border-color: $accent-color;
@@ -125,6 +131,14 @@ $border-color: #2a2a4a;
     font-weight: 500;
     cursor: pointer;
     transition: background 0.2s;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    gap: 6px;
+
+    i {
+      font-size: 16px;
+    }
 
     &:hover {
       background: color.adjust($accent-color, $lightness: -10%);