Phase 2: Native macOS menu bar app + DMG download from dashboard

.gitignore

@@ -4,3 +4,5 @@ __pycache__/
 .DS_Store
 ._*
 *.db
+*.dmg
+downloads/

dashboard/static/index.html

@@ -350,7 +350,10 @@ async function loadBridge(){
     if(!b.connected){
       el.innerHTML=`<div class="bridge-bar">
         <div class="bridge-info"><div class="bridge-dot offline"></div><span>Mac Bridge: Not installed</span></div>
-        <div class="bridge-actions"><button class="btn-save" onclick="installBridge()">Install Mac Bridge</button></div>
+        <div class="bridge-actions">
+          <button class="btn-save" onclick="downloadBridgeApp()">Download App</button>
+          <button class="btn-secondary" onclick="installBridge()">Install Script</button>
+        </div>
       </div>`;
     } else {
       const ago=timeAgo(b.last_heartbeat);
@@ -370,6 +373,10 @@ async function loadBridge(){
   }catch(e){console.error('Bridge check failed:',e)}
 }
 
+async function downloadBridgeApp(){
+  window.open(API+'/static/downloads/AgentBridge.dmg','_blank');
+}
+
 async function installBridge(){
   window.open(API+'/api/bridge/install-script','_blank');
 }