feat(ui): unify loading empty error states

frontend/scripts/verify-ui-contract.mjs

@@ -101,6 +101,27 @@ for (const className of requiredAdminProjectDetailClasses) {
   }
 }
 
+const stateComponents = [
+  "src/components/StateLoading.vue",
+  "src/components/StateEmpty.vue",
+  "src/components/StateError.vue"
+];
+
+const requiredStateClasses = [
+  "ctms-state",
+  "ctms-state-title",
+  "ctms-state-desc"
+];
+
+for (const file of stateComponents) {
+  const content = readFileSync(file, "utf8");
+  for (const className of requiredStateClasses) {
+    if (!content.includes(className)) {
+      missing.push(`${file}:${className}`);
+    }
+  }
+}
+
 if (missing.length) {
   console.error("UI contract check failed. Missing:", missing.join(", "));
   process.exit(1);

frontend/src/components/StateEmpty.vue

@@ -1,12 +1,12 @@
 <template>
-  <div class="state state-empty">
-    <el-icon class="state-icon"><Document /></el-icon>
-    <div class="state-title">{{ title }}</div>
-    <div v-if="description" class="state-desc">{{ description }}</div>
-    <div v-if="$slots.action" class="state-action">
+  <section class="ctms-state state state-empty">
+    <el-icon class="ctms-state-icon state-icon"><Document /></el-icon>
+    <h3 class="ctms-state-title state-title">{{ title }}</h3>
+    <p v-if="description" class="ctms-state-desc state-desc">{{ description }}</p>
+    <div v-if="$slots.action" class="ctms-state-action state-action">
       <slot name="action" />
     </div>
-  </div>
+  </section>
 </template>
 
 <script setup lang="ts">
@@ -26,35 +26,15 @@ withDefaults(
 </script>
 
 <style scoped>
-.state {
-  display: flex;
-  flex-direction: column;
-  align-items: center;
-  justify-content: center;
-  padding: 40px 12px;
-  color: var(--ctms-text-secondary);
-  text-align: center;
-}
-
 .state-icon {
-  font-size: 36px;
   color: var(--ctms-text-disabled);
-  margin-bottom: 10px;
 }
 
 .state-title {
-  font-size: 14px;
-  font-weight: 600;
   color: var(--ctms-text-regular);
 }
 
 .state-desc {
-  font-size: 12px;
   color: var(--ctms-text-secondary);
-  margin-top: 6px;
-}
-
-.state-action {
-  margin-top: 12px;
 }
 </style>

frontend/src/components/StateError.vue

@@ -1,12 +1,12 @@
 <template>
-  <div class="state state-error">
-    <el-icon class="state-icon"><CircleClose /></el-icon>
-    <div class="state-title">{{ title }}</div>
-    <div v-if="description" class="state-desc">{{ description }}</div>
-    <div v-if="$slots.action" class="state-action">
+  <section class="ctms-state state state-error">
+    <el-icon class="ctms-state-icon state-icon"><CircleClose /></el-icon>
+    <h3 class="ctms-state-title state-title">{{ title }}</h3>
+    <p v-if="description" class="ctms-state-desc state-desc">{{ description }}</p>
+    <div v-if="$slots.action" class="ctms-state-action state-action">
       <slot name="action" />
     </div>
-  </div>
+  </section>
 </template>
 
 <script setup lang="ts">
@@ -26,35 +26,15 @@ withDefaults(
 </script>
 
 <style scoped>
-.state {
-  display: flex;
-  flex-direction: column;
-  align-items: center;
-  justify-content: center;
-  padding: 40px 12px;
-  color: var(--ctms-text-secondary);
-  text-align: center;
-}
-
 .state-icon {
-  font-size: 36px;
   color: var(--ctms-danger);
-  margin-bottom: 10px;
 }
 
 .state-title {
-  font-size: 14px;
-  font-weight: 600;
   color: var(--ctms-text-main);
 }
 
 .state-desc {
-  font-size: 12px;
   color: var(--ctms-text-secondary);
-  margin-top: 6px;
-}
-
-.state-action {
-  margin-top: 12px;
 }
 </style>

frontend/src/components/StateLoading.vue

@@ -1,25 +1,24 @@
 <template>
-  <div class="state state-loading">
-    <el-skeleton :rows="rows" animated />
-  </div>
+  <section class="ctms-state ctms-state-loading state state-loading">
+    <h3 class="ctms-state-title state-title">{{ title }}</h3>
+    <p class="ctms-state-desc state-desc">{{ description }}</p>
+    <el-skeleton :rows="rows" animated class="ctms-state-skeleton" />
+  </section>
 </template>
 
 <script setup lang="ts">
+import { TEXT } from "../locales";
+
 withDefaults(
   defineProps<{
     rows?: number;
+    title?: string;
+    description?: string;
   }>(),
   {
     rows: 4,
+    title: TEXT.common.loading,
+    description: TEXT.common.messages.loadSuccess,
   }
 );
 </script>
-
-<style scoped>
-.state-loading {
-  padding: 24px;
-  border: 1px solid var(--ctms-border-color);
-  border-radius: var(--ctms-radius);
-  background-color: #ffffff;
-}
-</style>

frontend/src/styles/main.css

@@ -437,6 +437,45 @@ body {
   font-weight: 600;
 }
 
+/* Unified loading / empty / error states */
+.ctms-state {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  gap: 8px;
+  padding: 28px 16px;
+  text-align: center;
+  border: 1px solid var(--ctms-border-color);
+  border-radius: var(--ctms-radius);
+  background: #ffffff;
+}
+
+.ctms-state-icon {
+  font-size: 34px;
+}
+
+.ctms-state-title {
+  margin: 0;
+  font-size: 15px;
+  font-weight: 600;
+}
+
+.ctms-state-desc {
+  margin: 0;
+  font-size: 13px;
+  color: var(--ctms-text-secondary);
+}
+
+.ctms-state-action {
+  margin-top: 4px;
+}
+
+.ctms-state-loading .ctms-state-skeleton {
+  width: min(560px, 100%);
+  margin-top: 4px;
+}
+
 /* Tool classes */
 .text-main {
   color: var(--ctms-text-main);