feat: enhance modal photo with curly brackets and engaging CTA

- Replace blue border with green curly brackets { } using CSS pseudo-elements
- Add proper spacing and vertical centering with inline-flex
- Add engaging subtext below GitHub button: "Want to know how it's built?"
- Bilingual support for subtext (EN/ES)

static/css/main.css

@@ -2750,8 +2750,37 @@ html {
     height: 53px;
     object-fit: cover;
     border-radius: 4px;
-    border: 2px solid #27ae60;
-    box-shadow: 0 2px 8px rgba(39, 174, 96, 0.2);
+    border: none;
+    box-shadow: none;
+}
+
+.photo-bracket-wrapper {
+    position: relative;
+    display: inline-flex;
+    align-items: center;
+    padding: 0 22px;
+}
+
+.photo-bracket-wrapper::before {
+    content: '{';
+    position: absolute;
+    left: 2px;
+    font-size: 2rem;
+    font-weight: 700;
+    color: #27ae60;
+    line-height: 1;
+    top: 8px;
+}
+
+.photo-bracket-wrapper::after {
+    content: '}';
+    position: absolute;
+    right: 2px;
+    font-size: 2rem;
+    font-weight: 700;
+    color: #27ae60;
+    line-height: 1;
+    top: 8px;
 }
 
 .info-modal-body {
@@ -2833,6 +2862,15 @@ html {
     box-shadow: 0 4px 15px rgba(39, 174, 96, 0.3);
 }
 
+.info-modal-github-subtext {
+    text-align: center;
+    font-size: 0.9rem;
+    color: #666;
+    margin-top: 0.5rem;
+    margin-bottom: 0;
+    font-style: italic;
+}
+
 /* Mobile responsive */
 @media (max-width: 768px) {
     .info-modal-content {