Add expand and fade-in animations to conditional form sections

Add smooth animations to form sections that appear when toggles are enabled, improving user experience with visual feedback.

Changes:
- Add expandFadeIn keyframe animation to Tailwind config
- Apply expand-fade-in animation to UserSettingsForm payment sections
- Apply expand-fade-in animation to LocationEditForm conditional fields
- Update account page HomeIcon color from green to white for consistency

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/ui/LocationEditForm.tsx

@@ -119,7 +119,7 @@ export const LocationEditForm: FC<LocationEditFormProps> = ({ location, yearMont
                         </fieldset>
 
                         {formValues.tenantPaymentMethod === "iban" && userSettings?.enableIbanPayment ? (
-                            <>
+                            <div className="animate-expand-fade-in origin-top">
                                 <div className="divider mt-4 mb-2 font-bold uppercase">{t("iban-payment--form-title")}</div>
                                 <div className="form-control w-full">
                                     <label className="label">
@@ -192,7 +192,7 @@ export const LocationEditForm: FC<LocationEditFormProps> = ({ location, yearMont
                                             ))}
                                     </div>
                                 </div>
-                            </>
+                            </div>
                         ) :   // ELSE include hidden inputs to preserve existing values
                             <>
                                 <input
@@ -266,7 +266,7 @@ export const LocationEditForm: FC<LocationEditFormProps> = ({ location, yearMont
                         </fieldset>
 
                         {formValues.rentDueNotification && (
-                            <>
+                            <div className="animate-expand-fade-in origin-top">
                                 <fieldset className="fieldset mt-2 p-2">
                                     <legend className="fieldset-legend">{t("rent-due-day-label")}</legend>
                                     <select defaultValue={formValues.rentDueDay}
@@ -301,7 +301,7 @@ export const LocationEditForm: FC<LocationEditFormProps> = ({ location, yearMont
                                             ))}
                                     </div>
                                 </fieldset>
-                            </>
+                            </div>
                         )}
                     </fieldset>