DEV: Fix unwanted stylelint changes, do cleanup (#31140)

app/assets/stylesheets/common/components/date-input.scss

@@ -15,7 +15,6 @@ $calendar-icon: '<svg xmlns="http://www.w3.org/2000/svg" width="14px" height="16
     box-shadow: none;
     position: relative;
 
-    &::input-placeholder,
     &::input-placeholder,
     &::placeholder {
       font-size: var(--font-0);

app/assets/stylesheets/common/components/footer-nav.scss

@@ -74,7 +74,6 @@ html.footer-nav-visible {
     background-color: rgba(var(--header_background-rgb), 0.7);
 
     /* prefix needed for iOS < 18 */
-    /* stylelint-disable-next-line property-no-vendor-prefix */
     -webkit-backdrop-filter: blur(20px);
     backdrop-filter: blur(20px);
   }

app/assets/stylesheets/vendor/normalize.scss

@@ -10,7 +10,7 @@
 
 html {
   line-height: 1.15; /* 1 */
-  text-size-adjust: 100%; /* 2 */
+  -webkit-text-size-adjust: 100%; /* 2 */
 }
 
 /* Sections

app/assets/stylesheets/vendor/rotate-center.scss

@@ -1,7 +1,7 @@
 /* ----------------------------------------------
  * Generated by Animista on 2023-7-17 8:32:34
  * Licensed under FreeBSD License.
- * See http://animista.net/license for more info. 
+ * See http://animista.net/license for more info.
  * w: http://animista.net, t: @cssanimista
  * ---------------------------------------------- */
 
@@ -19,12 +19,3 @@
             transform: rotate(360deg);
   }
 }
-@keyframes rotate-center {
-  0% {
-            transform: rotate(0);
-  }
-
-  100% {
-            transform: rotate(360deg);
-  }
-}