优化讲解详情正文按钮显示

src/pages/exhibit/detail.vue

@@ -78,7 +78,7 @@
               :class="{ disabled: detailTextLoading }"
               @tap="handleLoadDetailText"
             >
-              <text class="text-load-btn-text">{{ detailTextLoading ? '正在加载' : '查看图文讲解' }}</text>
+              <text class="text-load-btn-text">{{ detailTextLoading ? '正在加载' : detailTextLoadActionText }}</text>
             </view>
             <text v-if="detailTextUnavailableMessage" class="section-hint">{{ detailTextUnavailableMessage }}</text>
           </view>
@@ -239,15 +239,37 @@ const visibleLanguageOptions = computed(() => (
   languageOptions.filter((option) => supportedDetailLanguages.value.has(option.value))
 ))
 const isLanguageSwitchVisible = computed(() => visibleLanguageOptions.value.length > 1)
-const isTextLoadActionVisible = computed(() => (
+const hasTextLoadTarget = computed(() => Boolean(
+  exhibit.value.audio.playTargetId || exhibit.value.id
+))
+const normalizedDetailSummary = computed(() => exhibit.value.summary.trim())
+const hasMeaningfulDetailSummary = computed(() => (
+  normalizedDetailSummary.value
+  && normalizedDetailSummary.value !== defaultDetail.summary
+))
+const isDetailSummaryLikelyComplete = computed(() => (
+  hasMeaningfulDetailSummary.value
+  && normalizedDetailSummary.value.length >= 120
+))
+const hasDeferredDetailText = computed(() => (
   exhibit.value.audio.hasText === true
   && !detailTextLoaded.value
   && !detailTextUnavailableMessage.value
+  && hasTextLoadTarget.value
+  && !isDetailSummaryLikelyComplete.value
+))
+const isTextLoadActionVisible = computed(() => hasDeferredDetailText.value)
+const detailTextLoadActionText = computed(() => (
+  hasMeaningfulDetailSummary.value
+    ? '查看完整讲解词'
+    : '加载讲解正文'
 ))
 const detailBodyText = computed(() => (
   detailTextLoaded.value
     ? exhibit.value.body || exhibit.value.summary
-    : exhibit.value.summary
+    : hasDeferredDetailText.value && !hasMeaningfulDetailSummary.value
+      ? '已找到当前语言讲解词，可加载查看完整正文。'
+      : exhibit.value.summary
 ))
 
 // 讲解详情页只定位到所属展厅，不再追踪具体展品点位。