refactor: Move Start/Restart/Clear to nav bar popup outside terminal

- Titlebar only keeps toggle and close buttons
- Toggle button wider to use freed space
- Nav bar opens as popup below terminal (no internal space change)
- Added Start/Restart agent buttons to TerminalNavButtons
- Backdrop blur on popup bar

frontend/src/components/TerminalNavButtons.vue

@@ -1,6 +1,8 @@
 <script setup lang="ts">
 defineProps<{
   waitingForToken?: boolean
+  showStart?: boolean
+  showRestart?: boolean
 }>()
 
 defineEmits<{
@@ -10,6 +12,7 @@ defineEmits<{
   runClaudeResume: []
   clearBuffer: []
   refresh: []
+  restart: []
   sendKey: [key: string]
   scroll: [direction: 'up' | 'down' | 'end']
 }>()
@@ -17,6 +20,16 @@ defineEmits<{
 
 <template>
   <div class="tnb-bar">
+    <!-- Agent lifecycle -->
+    <button v-if="showStart" class="tnb-btn start" title="Start Agent" @click="$emit('restart')">
+      <svg width="12" height="12" viewBox="0 0 24 24" fill="currentColor"><polygon points="5 3 19 12 5 21 5 3"/></svg>
+      <span class="tnb-label">Start</span>
+    </button>
+    <button v-if="showRestart" class="tnb-btn restart" title="Restart Agent" @click="$emit('restart')">
+      <svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M21 12a9 9 0 1 1-6.219-8.56"/></svg>
+      <span class="tnb-label">Restart</span>
+    </button>
+    <span v-if="showStart || showRestart" class="tnb-sep"></span>
     <!-- Action buttons -->
     <button class="tnb-btn mcp" :class="{ waiting: waitingForToken }" title="Connect MCP" @click="$emit('requestToken')">
       <svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71"/><path d="M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71"/></svg>
@@ -129,6 +142,12 @@ defineEmits<{
   font-weight: 500;
 }
 
+/* Agent lifecycle */
+.tnb-btn.start { color: #10b981; border-color: rgba(16, 185, 129, 0.2); }
+.tnb-btn.start:hover { background: rgba(16, 185, 129, 0.2); border-color: rgba(16, 185, 129, 0.3); color: #34d399; }
+.tnb-btn.restart { color: rgba(245, 158, 11, 0.8); border-color: rgba(245, 158, 11, 0.2); }
+.tnb-btn.restart:hover { background: rgba(245, 158, 11, 0.2); border-color: rgba(245, 158, 11, 0.3); color: #f59e0b; }
+
 /* Action button variants */
 .tnb-btn.mcp:hover { background: rgba(236, 72, 153, 0.2); border-color: rgba(236, 72, 153, 0.3); color: #ec4899; }
 .tnb-btn.mcp.waiting { background: rgba(16, 185, 129, 0.2); border-color: #10b981; color: #10b981; animation: tnb-pulse 0.8s infinite; }

frontend/src/components/agent/AgentTerminal.vue

@@ -265,29 +265,6 @@ onBeforeUnmount(() => {
               <span v-else-if="terminalState === 'crashed'" class="at-status-text crashed">Crashed</span>
             </div>
             <div class="window-controls">
-              <button
-                v-if="terminalState === 'crashed' || terminalState === 'off'"
-                class="wc-btn start"
-                title="Start Agent"
-                @click.stop="handleRestart"
-              >
-                <svg width="10" height="10" viewBox="0 0 24 24" fill="currentColor"><polygon points="5 3 19 12 5 21 5 3"/></svg>
-              </button>
-              <button
-                v-if="agentRunning"
-                class="wc-btn restart"
-                title="Restart Agent"
-                @click.stop="handleRestart"
-              >
-                <svg width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M21 12a9 9 0 1 1-6.219-8.56"/></svg>
-              </button>
-              <button
-                class="wc-btn"
-                title="Clear Buffer"
-                @click.stop="clearBuffer"
-              >
-                <svg width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M3 6h18M8 6V4a2 2 0 012-2h4a2 2 0 012 2v2m3 0v14a2 2 0 01-2 2H7a2 2 0 01-2-2V6h14"/></svg>
-              </button>
               <button
                 class="wc-btn nav-toggle"
                 :class="{ active: showNavButtons }"
@@ -302,19 +279,6 @@ onBeforeUnmount(() => {
             </div>
           </div>
 
-          <!-- Nav buttons bar -->
-          <TerminalNavButtons
-            v-if="showNavButtons"
-            @request-token="agentTerminal.sendInput('genera token usando tu mcp')"
-            @run-claude="navRunClaude"
-            @run-claude-continue="navRunClaudeContinue"
-            @run-claude-resume="navRunClaudeResume"
-            @clear-buffer="clearBuffer"
-            @refresh="navRefresh"
-            @send-key="navSendKey"
-            @scroll="navScroll"
-          />
-
           <!-- Terminal content -->
           <div class="at-content" :style="{ background: agentBg }">
             <div ref="terminalContainer" class="at-term"></div>
@@ -341,6 +305,23 @@ onBeforeUnmount(() => {
           <!-- Resize handle -->
           <div class="at-resize" @mousedown="startResize"></div>
         </div>
+
+        <!-- Nav buttons bar (outside terminal, hangs from bottom) -->
+        <TerminalNavButtons
+          v-if="showNavButtons"
+          class="at-nav-popup"
+          :show-start="terminalState === 'crashed' || terminalState === 'off'"
+          :show-restart="agentRunning"
+          @request-token="agentTerminal.sendInput('genera token usando tu mcp')"
+          @run-claude="navRunClaude"
+          @run-claude-continue="navRunClaudeContinue"
+          @run-claude-resume="navRunClaudeResume"
+          @clear-buffer="clearBuffer"
+          @refresh="navRefresh"
+          @restart="handleRestart"
+          @send-key="navSendKey"
+          @scroll="navScroll"
+        />
       </div>
     </Transition>
   </Teleport>
@@ -442,9 +423,7 @@ onBeforeUnmount(() => {
 }
 .wc-btn:hover { background: rgba(255, 255, 255, 0.5); }
 .wc-btn.x:hover { background: linear-gradient(180deg, #e66 0%, #c33 100%); border-color: #a22; color: #fff; }
-.wc-btn.start { color: #0a0; }
+.wc-btn.nav-toggle { width: 44px; }
-.wc-btn.start:hover { background: rgba(16, 185, 129, 0.3); }
-.wc-btn.restart:hover { background: rgba(245, 158, 11, 0.3); color: #a80; }
 .wc-btn.nav-toggle.active { background: rgba(99, 102, 241, 0.3); border-color: rgba(99, 102, 241, 0.4); color: #818cf8; }
 .wc-btn.nav-toggle:hover { background: rgba(99, 102, 241, 0.2); color: #818cf8; }
 
@@ -513,6 +492,20 @@ onBeforeUnmount(() => {
 .agent-terminal.resizing { user-select: none; }
 .agent-terminal.resizing .at-term { pointer-events: none; }
 
+.at-nav-popup {
+  position: absolute;
+  left: 0;
+  right: 0;
+  top: 100%;
+  border-radius: 0 0 6px 6px;
+  border: 1px solid rgba(255, 255, 255, 0.1);
+  border-top: none;
+  backdrop-filter: blur(14px) saturate(1.3);
+  -webkit-backdrop-filter: blur(14px) saturate(1.3);
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
+  z-index: 1;
+}
+
 .at-slide-enter-active, .at-slide-leave-active { transition: all 0.15s ease; }
 .at-slide-enter-from, .at-slide-leave-to { opacity: 0; transform: translateY(16px) scale(0.98); }