fix: unify number stepper layout and detail modal padding (#279)

Reorder stepper DOM elements (input first) and apply refill-number-stepper
class to both steppers for consistent CSS order-based layout.
Fix missing bottom padding on .med-detail-body.

frontend/src/styles/medication-workflows.css

@@ -446,7 +446,7 @@
 }
 
 .refill-number-stepper input {
-	order: initial;
+	order: 0;
 	text-align: center;
 	padding: 0.75rem 0.5rem;
 }
@@ -460,13 +460,13 @@
 }
 
 .refill-number-stepper .stepper-btn.decrement {
-	order: initial;
+	order: -1;
 	background: color-mix(in srgb, var(--danger) 22%, var(--bg-tertiary));
 	color: var(--danger);
 }
 
 .refill-number-stepper .stepper-btn.increment {
-	order: initial;
+	order: 1;
 	border-right: none;
 	border-left: 1px solid var(--border-primary);
 	background: color-mix(in srgb, var(--success) 22%, var(--bg-tertiary));