fix(clients): use primary color for active register-client tab

Switch active-tab styling from the low-contrast accent/10 background to
primary + primary-foreground for better visibility.

Signed-off-by: crimsonsunset <jsangio1@gmail.com>

Author: crimsonsunset

apps/desktop/src/features/clients/RegisterApiKeyClientModal.tsx

@@ -489,7 +489,7 @@ export function RegisterApiKeyClientModal({
                   data-testid="register-api-key-tab-cursor"
                   className={`flex-1 rounded-lg px-3 py-2 text-sm font-medium transition-all ${
                     activeTab === 'cursor'
-                      ? 'bg-[rgb(var(--accent))]/10 text-[rgb(var(--accent))]'
+                      ? 'bg-[rgb(var(--primary))] text-[rgb(var(--primary-foreground))] shadow-sm'
                       : 'text-[rgb(var(--muted))] hover:text-[rgb(var(--text))]'
                   }`}
                   onClick={() => handleTabChange('cursor')}
@@ -503,7 +503,7 @@ export function RegisterApiKeyClientModal({
                   data-testid="register-api-key-tab-generic"
                   className={`flex-1 rounded-lg px-3 py-2 text-sm font-medium transition-all ${
                     activeTab === 'generic'
-                      ? 'bg-[rgb(var(--accent))]/10 text-[rgb(var(--accent))]'
+                      ? 'bg-[rgb(var(--primary))] text-[rgb(var(--primary-foreground))] shadow-sm'
                       : 'text-[rgb(var(--muted))] hover:text-[rgb(var(--text))]'
                   }`}
                   onClick={() => handleTabChange('generic')}