fix(gitea) : propagate API errors instead of silently returning empty results

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/components/task/TaskGitSection.vue

@@ -61,7 +61,7 @@
 
         <!-- Error state -->
         <div v-if="error" class="px-4 py-3">
-            <p class="text-xs text-red-500">{{ $t('gitea.error') }}</p>
+            <p class="text-xs text-red-500">{{ error }}</p>
         </div>
 
         <!-- Create branch form (inline) -->
@@ -248,7 +248,7 @@ const pullRequests = ref<GiteaPullRequest[]>([])
 const isLoading = ref(true)
 const isLoadingPrs = ref(true)
 const isCreating = ref(false)
-const error = ref(false)
+const error = ref('')
 const showCreateForm = ref(false)
 const expandedBranches = ref(new Set<string>())
 
@@ -338,7 +338,7 @@ async function loadData() {
 
     isLoading.value = true
     isLoadingPrs.value = true
-    error.value = false
+    error.value = ''
 
     try {
         branches.value = await listBranches(props.task.id)
@@ -346,8 +346,8 @@ async function loadData() {
         if (branches.value.length === 1) {
             expandedBranches.value.add(branches.value[0].name)
         }
-    } catch {
-        error.value = true
+    } catch (e: any) {
+        error.value = e?.data?.detail || e?.data?.['hydra:description'] || t('gitea.error')
     } finally {
         isLoading.value = false
     }