Dark mode input fix (fixes #13312) (#13414)

* fix: add form-control class where missing

* fix: chat input background colour

* fix(pr): don't commit package changes

* fix(css): use white variable

Co-authored-by: J Sanderson <julia@parentscheme.com>
Co-authored-by: Sabe Jones <sabrecat@gmail.com>

website/client/src/components/challenges/challengeModal.vue

@@ -154,6 +154,7 @@
         <input
           v-model="workingChallenge.prize"
           type="number"
+          class="form-control"
           :min="minPrize"
           :max="maxPrize"
           @change="enableSubmit"

website/client/src/components/shops/buyModal.vue

@@ -82,6 +82,7 @@
             <div class="box">
               <input
                 v-model.number="selectedAmountToBuy"
+                class="form-control"
                 type="number"
                 min="0"
                 step="1"

website/client/src/components/shops/quests/buyQuestModal.vue

@@ -45,6 +45,7 @@
           <div class="box">
             <input
               v-model.number="selectedAmountToBuy"
+              class="form-control"
               type="number"
               min="0"
               step="1"

website/client/src/pages/private-messages.vue

@@ -420,6 +420,7 @@
     padding-right: 1.5rem;
 
     textarea {
+      background: $white;
       display: inline-block;
       vertical-align: bottom;
       border-radius: 2px;