feat(15): start form, save state, decode steps

15-multi-step-form/src/main/resources/templates/step2.html

@@ -166,6 +166,7 @@
               <input
                 class="mr-2 w-9 h-5 ml-2 rounded-full appearance-none mt-[0.3rem] bg-marine-blue after:absolute after:h-3 after:w-3 after:rounded-full after:border-none after:bg-neutral-100  after:transition-[background-color_0.2s,transform_0.2s] checked:after:ml-[1.2rem] after:ml-[0.25rem] after:mt-[0.25rem] hover:cursor-pointer col-start-2 row-start-1 peer"
                 type="checkbox"
+                name="isPackageYearly"
                 role="switch"
                 id="packageDuration"
               />

15-multi-step-form/src/main/resources/templates/step3.html

@@ -114,6 +114,7 @@
               <input
                 id="multiplayer-games"
                 type="checkbox"
+                value="OnlineService"
                 name="addon-services"
                 class="my-7 w-6 h-6 peer"
               />
@@ -137,6 +138,7 @@
                 id="larger-storage"
                 type="checkbox"
                 name="addon-services"
+                value="LargerStorage"
                 class="my-7 w-6 h-6 peer"
               />
               <div
@@ -159,6 +161,7 @@
                 id="custom-profile"
                 type="checkbox"
                 name="addon-services"
+                value="CustomProfile"
                 class="my-7 w-6 h-6 peer"
               />
               <div