fix(v2): reviewer bugfixes — scroll, block-status, NaN guard, dead code cleanup

frontend/src/components/dashboard/v2/FlowCanvas.vue

@@ -291,7 +291,7 @@ function handleReset() {
         Reset
       </button>
 
-      <button class="add-btn" @click="$emit('add')">
+      <button class="add-btn" @click="emit('add')">
         <span class="btn-icon" v-html="icons.plus || ''"></span>
         Agent hinzufügen
       </button>
@@ -305,7 +305,6 @@ function handleReset() {
     ></svg>
 
     <!-- Agent Nodes -->
-    <div class="nodes-layer" v-html="''"></div>
     <AgentNode
       v-for="agent in agents"
       :key="agent.id"
@@ -314,7 +313,7 @@ function handleReset() {
       :top="(positions[agent.id] || autoPositions[agent.id] || { x: 50, y: 50 }).y"
       :entering="enteringIds.includes(agent.id)"
       :data-id="agent.id"
-      @select="(id: string) => $emit('select', id)"
+      @select="(id: string) => emit('select', id)"
     />
 
     <!-- Layout Label -->