fix: tema claro blanco, logo 4Ventures y menú original

Fondo blanco en la app; menú con labels/iconos originales; logo en sidebar y login.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/app/globals.css

@@ -3,39 +3,34 @@
 @tailwind utilities;
 
 :root {
-  --background: #0b0f19;
-  --foreground: #f3f4f6;
-  --card: #111827;
-  --sidebar: #0d121f;
-  --border: rgba(255, 255, 255, 0.06);
+  --background: #ffffff;
+  --foreground: #111827;
+  --card: #ffffff;
+  --sidebar: #ffffff;
+  --border: #e5e7eb;
   --brand: #e58a3c;
-  --muted: #9ca3af;
+  --muted: #6b7280;
 }
 
 html {
-  color-scheme: dark;
+  color-scheme: light;
 }
 
 body {
   background-color: var(--background);
   color: var(--foreground);
   font-family: var(--font-sans), ui-sans-serif, system-ui, sans-serif;
-  background-image:
-    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(229, 138, 60, 0.12), transparent 55%),
-    radial-gradient(ellipse 60% 40% at 100% 0%, rgba(56, 189, 248, 0.06), transparent 50%);
-  background-attachment: fixed;
   min-height: 100vh;
 }
 
-/* Scrollbars sobrios */
 * {
   scrollbar-width: thin;
-  scrollbar-color: #1f2937 transparent;
+  scrollbar-color: #d1d5db transparent;
 }
 
 ::selection {
-  background: rgba(229, 138, 60, 0.35);
-  color: #fff;
+  background: rgba(229, 138, 60, 0.25);
+  color: #111827;
 }
 
 @layer utilities {