Adopt shared WebUI structural primitives

webui/src/styles/forms.css

@@ -1,39 +1,14 @@
-.forms-page,
-.forms-shell {
+.forms-page {
   height: 100%;
   min-height: 0;
   overflow: hidden;
 }
 
-.forms-shell {
-  display: flex;
-  flex-direction: column;
-  background: var(--surface);
-}
-
-.forms-toolbar {
-  display: flex;
-  align-items: center;
-  gap: 10px;
-  min-height: 58px;
-  padding: 10px 18px;
-  border-bottom: 1px solid var(--border);
-  background: var(--surface-raised);
-}
-
 .forms-search {
-  display: flex;
-  align-items: center;
-  gap: 8px;
-  width: min(520px, 100%);
+  flex: 1 1 520px;
   margin-right: auto;
 }
 
-.forms-search input {
-  min-width: 120px;
-  flex: 1;
-}
-
 .forms-toolbar > label {
   display: flex;
   align-items: center;
@@ -122,12 +97,6 @@
   color: var(--text-soft);
 }
 
-.forms-empty {
-  padding: 36px 0;
-  color: var(--text-soft);
-  text-align: center;
-}
-
 .form-definition-dialog {
   width: min(1120px, calc(100vw - 32px));
   height: min(860px, calc(100vh - 32px));
@@ -171,19 +140,6 @@
   font-weight: 600;
 }
 
-.form-field-editor-heading {
-  display: flex;
-  align-items: center;
-  justify-content: space-between;
-  gap: 12px;
-}
-
-.form-field-editor-heading h3 {
-  margin: 0;
-  font-size: 0.98rem;
-  letter-spacing: 0;
-}
-
 .form-field-editor-list {
   border-top: 1px solid var(--border);
 }
@@ -313,15 +269,6 @@
 }
 
 @media (max-width: 900px) {
-  .forms-toolbar {
-    align-items: stretch;
-    flex-wrap: wrap;
-  }
-
-  .forms-search {
-    width: 100%;
-  }
-
   .forms-row {
     grid-template-columns: minmax(0, 1fr) auto auto;
   }