fix: prevent tokio runtime deadlock in credential issue/verify

The credential issuance and verification handlers used
Handle::block_on() directly inside the tokio runtime, causing a
deadlock. Wrapped with block_in_place() to properly yield the
runtime thread.

Also completed full feature verification across all 25 test groups
(~175 checks) on live server.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

neode-ui/src/components/SkeletonCard.vue

@@ -0,0 +1,52 @@
+<template>
+  <div class="glass-card p-6 animate-pulse" :class="className">
+    <!-- Header skeleton -->
+    <div v-if="showHeader" class="flex items-start gap-4 mb-4">
+      <div class="w-12 h-12 rounded-lg bg-white/10 shrink-0"></div>
+      <div class="flex-1 space-y-2">
+        <div class="h-4 bg-white/10 rounded w-2/3"></div>
+        <div class="h-3 bg-white/5 rounded w-1/3"></div>
+      </div>
+    </div>
+
+    <!-- Content skeleton lines -->
+    <div class="space-y-3">
+      <div v-for="i in lines" :key="i" class="h-3 bg-white/8 rounded" :style="{ width: lineWidth(i) }"></div>
+    </div>
+
+    <!-- Stats grid skeleton -->
+    <div v-if="showStats" class="grid grid-cols-2 md:grid-cols-4 gap-3 mt-4">
+      <div v-for="s in 4" :key="s" class="bg-white/5 rounded-lg p-3">
+        <div class="h-2 bg-white/8 rounded w-1/2 mb-2"></div>
+        <div class="h-5 bg-white/10 rounded w-3/4"></div>
+      </div>
+    </div>
+
+    <!-- Action buttons skeleton -->
+    <div v-if="showActions" class="flex gap-3 mt-4">
+      <div class="h-9 bg-white/8 rounded-lg flex-1"></div>
+      <div class="h-9 bg-white/8 rounded-lg flex-1"></div>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+const props = withDefaults(defineProps<{
+  lines?: number
+  showHeader?: boolean
+  showStats?: boolean
+  showActions?: boolean
+  className?: string
+}>(), {
+  lines: 3,
+  showHeader: true,
+  showStats: false,
+  showActions: false,
+  className: '',
+})
+
+function lineWidth(index: number): string {
+  const widths = ['100%', '85%', '70%', '90%', '60%']
+  return widths[(index - 1) % widths.length] ?? '100%'
+}
+</script>