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)

data/ui-en.json

@@ -8,6 +8,7 @@
       "html5": "Semantic HTML5",
       "css3": "Pure CSS3"
     },
-    "viewSource": "View Project in Github"
+    "viewSource": "View Project in Github",
+    "viewSourceSubtext": "Want to know how it's built?"
   }
 }

data/ui-es.json

@@ -8,6 +8,7 @@
       "html5": "HTML5 Semántico",
       "css3": "CSS3 Puro"
     },
-    "viewSource": "Ver proyecto en Github"
+    "viewSource": "Ver proyecto en Github",
+    "viewSourceSubtext": "¿Quieres saber cómo está hecho?"
   }
 }