feat(mesh): server name in adverts + clear-all button + CI fix

- Mesh adverts now use the node's configured server name (e.g. "ThinkPad",
  "Arch Dev") instead of DID key fragments ("Archy-z6MkmkSB")
- Added mesh.clear-all RPC to reset peers, messages, contacts, and history
- Added "Clear All" button in Mesh UI peers panel
- Both glibc and musl builds verified

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

neode-ui/src/views/Mesh.vue

@@ -229,6 +229,17 @@ async function refreshOutboxCount() {
   }
 }
 
+async function clearAllMesh() {
+  if (!window.confirm('Clear all mesh peers, messages, and chat history? This cannot be undone.')) return
+  try {
+    await rpcClient('mesh.clear-all')
+    await mesh.refreshAll()
+    selectedPeer.value = null
+  } catch (e) {
+    console.error('Failed to clear mesh:', e)
+  }
+}
+
 // Phase 4: Off-grid Bitcoin + Dead Man's Switch
 const activeTab = ref<'chat' | 'bitcoin' | 'deadman' | 'map'>('chat')
 
@@ -1341,7 +1352,10 @@ function isImageMime(mime?: string): boolean {
 
         <!-- Peers list -->
         <div data-controller-container tabindex="0" class="glass-card mesh-peers-card">
-          <h2 class="mesh-section-title">Peers <span class="mesh-peer-count">{{ mesh.peers.length }}</span></h2>
+          <div class="flex items-center justify-between">
+            <h2 class="mesh-section-title">Peers <span class="mesh-peer-count">{{ mesh.peers.length }}</span></h2>
+            <button class="text-xs text-white/40 hover:text-red-400 transition-colors px-2 py-1" @click="clearAllMesh" title="Clear all peers, messages, and chat history">Clear All</button>
+          </div>
 
           <div v-if="mesh.peers.length === 0 && !mesh.status?.device_connected" class="mesh-empty">
             No peers discovered yet.