Apply tenant theme on business login and polish login branding.

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

apps/business/src/pages/LoginPage.module.css

@@ -1,10 +1,12 @@
 .page {
   min-height: 100vh;
   display: flex;
+  flex-direction: column;
   align-items: center;
   justify-content: center;
   padding: 24px;
   position: relative;
+  gap: 20px;
 }
 
 .card {
@@ -60,6 +62,18 @@
   margin-top: 2px;
 }
 
+.poweredBy {
+  font-size: 12px;
+  font-weight: 500;
+  color: var(--text-muted);
+  text-align: center;
+  transition: color 0.2s;
+}
+
+.poweredBy:hover {
+  color: var(--primary);
+}
+
 .title {
   font-size: 24px;
   font-weight: 700;