refactor(ui): restrict external asset overrides to development mode

assets/icons/file.svg

@@ -1,13 +1,7 @@
-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 48 48" width="48" height="48">
-  <!-- Folha de documento com dobra -->
-  <path d="M 8 4 L 32 4 L 42 14 L 42 44 L 8 44 Z" fill="#ffffff" stroke="#0288d1" stroke-width="2.5" stroke-linejoin="round"/>
-  <!-- Dobra de canto -->
-  <path d="M 32 4 L 32 14 L 42 14 Z" fill="#b3e5fc" stroke="#0288d1" stroke-width="2" stroke-linejoin="round"/>
-  <!-- Linhas de texto representativas -->
-  <line x1="14" y1="20" x2="34" y2="20" stroke="#cfd8dc" stroke-width="2" stroke-linecap="round"/>
-  <line x1="14" y1="26" x2="34" y2="26" stroke="#cfd8dc" stroke-width="2" stroke-linecap="round"/>
-  <!-- Caneta / Pena de assinatura eletrônica -->
-  <path d="M 16 38 L 30 24 L 35 29 L 21 43 L 14 44 Z" fill="#0288d1"/>
-  <path d="M 30 24 L 34 20 L 39 25 L 35 29 Z" fill="#01579b"/>
-  <circle cx="16" cy="42" r="1.5" fill="#ffffff"/>
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="24" height="24">
+  <path d="M 5 3.5 H 14 L 19 8.5 V 20.5 C 19 21.1 18.5 21.5 17.9 21.5 H 5 C 4.4 21.5 4 21.1 4 20.5 V 4.5 C 4 3.9 4.4 3.5 5 3.5 Z" 
+        fill="none" stroke="currentColor" stroke-width="2" stroke-linejoin="round"/>
+  <path d="M 14 3.5 V 8.5 H 19" fill="none" stroke="currentColor" stroke-width="2" stroke-linejoin="round"/>
+  <line x1="8" y1="13" x2="15" y2="13" stroke="currentColor" stroke-width="1.8" stroke-linecap="round"/>
+  <line x1="8" y1="17" x2="13" y2="17" stroke="currentColor" stroke-width="1.8" stroke-linecap="round"/>
 </svg>