Fix heights on transitions, text/plain display in dark mode

src-ui/src/app/components/common/input/select/select.component.ts

@@ -77,7 +77,7 @@ export class SelectComponent extends AbstractInputComponent<number> {
   }
 
   get isPrivate(): boolean {
-    return this.items.find((i) => i.id === this.value)?.private
+    return this.items?.find((i) => i.id === this.value)?.private
   }
 
   getSuggestions() {

src-ui/src/app/components/common/page-header/page-header.component.scss

@@ -0,0 +1,9 @@
+.h2 {
+    min-height: calc(1.325rem + 0.9vw);
+}
+
+@media (min-width: 1200px) {
+    .h2 {
+        min-height: 2.8rem;
+    }
+}

src-ui/src/theme.scss

@@ -246,6 +246,10 @@ $form-check-radio-checked-bg-image-dark: url("data:image/svg+xml,<svg xmlns='htt
       background-color: rgb(var(--bs-dark-rgb)) !important;
     }
   }
+
+  .preview-sticky.bg-white {
+    background-color: var(--pngx-bg-darker) !important;
+  }
 }
 
 body.color-scheme-dark {