feat(desktop): run-state becomes display-only; send key turns into a stop button while running

The top-left run-state is now a pure status indicator (green=ready, red=running)
and no longer handles clicks. Stopping the current turn moves to the send key:
while the agent is running the send button turns into a red stop square — clicking
it cancels the current turn (ChatGPT/Claude style). The Enter key still submits, so
"type while running + Enter" keeps lyx's interrupt-and-resend behavior (#5) intact.

- setBusy toggles .is-stop on the send button + aria-label (stop/send)
- send click: cancelPrompt() when busy, submitInput() otherwise
- remove run-toggle click handler + .stopped state; .run-state.busy goes red
- .send.is-stop: red bg + white rounded square (hide arrow); i18n act.send
- cache bust styles v19->20, app v25->26

frontends/desktop/static/app.js

@@ -304,7 +304,7 @@ const I18N = {
     'st.starting': '启动中…', 'st.stopping': '停止中…',
     'st.online': '在线', 'st.offline': '离线', 'st.error': '错误', 'st.running': '运行', 'st.abnormal': '异常',
     'act.configure': '配置', 'act.logs': '日志', 'act.restart': '重启', 'act.stop': '停止', 'act.start': '启动',
-    'act.copy': '复制', 'act.copied': '已复制', 'act.copyTex': 'TeX',
+    'act.copy': '复制', 'act.copied': '已复制', 'act.copyTex': 'TeX', 'act.send': '发送',
     'proc.imbotWechat': 'imbot · 微信', 'proc.imbotDing': 'imbot · 钉钉', 'proc.scheduler': '定时任务调度',
     'cm.scheduling': '调度中', 'cm.running': '执行中', 'cm.idleSt': '空闲',
     'cm.master': '已派 3 子任务', 'cm.w1': '子任务：抓取数据', 'cm.w2': '子任务：复核结果', 'cm.sub': '等待派单',
@@ -409,7 +409,7 @@ const I18N = {
     'st.starting': 'Starting…', 'st.stopping': 'Stopping…',
     'st.online': 'Online', 'st.offline': 'Offline', 'st.error': 'Error', 'st.running': 'Running', 'st.abnormal': 'Error',
     'act.configure': 'Configure', 'act.logs': 'Logs', 'act.restart': 'Restart', 'act.stop': 'Stop', 'act.start': 'Start',
-    'act.copy': 'Copy', 'act.copied': 'Copied', 'act.copyTex': 'TeX',
+    'act.copy': 'Copy', 'act.copied': 'Copied', 'act.copyTex': 'TeX', 'act.send': 'Send',
     'proc.imbotWechat': 'imbot · WeChat', 'proc.imbotDing': 'imbot · DingTalk', 'proc.scheduler': 'Scheduler',
     'cm.scheduling': 'Scheduling', 'cm.running': 'Running', 'cm.idleSt': 'Idle',
     'cm.master': 'Dispatched 3 subtasks', 'cm.w1': 'Subtask: fetch data', 'cm.w2': 'Subtask: review results', 'cm.sub': 'Waiting for tasks',
@@ -1041,22 +1041,19 @@ function statusLabel() {
   if (s && rt(s).busy) return t('status.running');
   return state.bridgeReady ? t('status.ready') : t('status.disconnected');
 }
-function refreshStatusLabel() { if (!runToggle.classList.contains('stopped')) runLabel.textContent = statusLabel(); }
+function refreshStatusLabel() { runLabel.textContent = statusLabel(); }
 function setBusy(sess, busy) {
   const r = rt(sess); r.busy = busy;
   if (!isActive(sess)) return;
-  runToggle.classList.remove('stopped');
   runToggle.classList.toggle('busy', busy);
   runLabel.textContent = busy ? t('status.running') : (state.bridgeReady ? t('status.ready') : t('status.disconnected'));
-}
+  if (sendBtn) {
-runToggle.addEventListener('click', async () => {
+    sendBtn.classList.toggle('is-stop', busy);
-  const sess = activeSess();
+    sendBtn.setAttribute('aria-label', busy ? t('act.stop') : t('act.send'));
-  if (sess && rt(sess).busy) {
+    sendBtn.title = busy ? t('act.stop') : '';
-    await cancelPrompt();
-    runLabel.textContent = t('status.stopped');
-    runToggle.classList.add('stopped');
   }
-});
+}
+// run-toggle 现为纯状态展示组件：运行中转红，不再响应点击（停止改由发送键的录制键承担）
 
 /* ═══════════════ 会话 ═══════════════ */
 function isUntitled(x) { return !x || /^(new chat|新对话|新会话)$/i.test(String(x).trim()); }
@@ -1406,7 +1403,12 @@ async function submitInput() {
     setComposerLocked(false);
   }
 }
-sendBtn.addEventListener('click', (e) => { e.preventDefault(); submitInput(); });
+sendBtn.addEventListener('click', (e) => {
+  e.preventDefault();
+  const sess = activeSess();
+  if (sess && rt(sess).busy) { cancelPrompt(); return; }  // 运行中：发送键是录制键 → 纯停止
+  submitInput();
+});
 inputEl.addEventListener('keydown', (e) => { if (e.key === 'Enter' && !e.shiftKey) { e.preventDefault(); submitInput(); } });
 inputEl.addEventListener('input', () => {
   inputEl.style.height = 'auto';

frontends/desktop/static/index.html

@@ -3,7 +3,7 @@
 <head>
 <meta charset="UTF-8">
 <title>GenericAgent</title>
-<link rel="stylesheet" href="styles.css?v=19">
+<link rel="stylesheet" href="styles.css?v=20">
 <!-- KaTeX: LaTeX 公式渲染 -->
 <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex@0.16.11/dist/katex.min.css" crossorigin="anonymous">
 <!-- highlight.js: 代码高亮 -->
@@ -451,7 +451,7 @@
 <script src="https://cdn.jsdelivr.net/npm/katex@0.16.11/dist/katex.min.js" crossorigin="anonymous"></script>
 <!-- highlight.js -->
 <script src="https://cdn.jsdelivr.net/gh/highlightjs/cdn-release@11.9.0/build/highlight.min.js" crossorigin="anonymous"></script>
-<script src="app.js?v=25"></script>
+<script src="app.js?v=26"></script>
 <script src="annot.js"></script><!-- DEV 脚手架，可删 -->
 </body>
 </html>

frontends/desktop/static/styles.css

@@ -497,19 +497,17 @@ html[data-appearance="dark"] .swatch[data-theme="8"].sel::after{
   padding:5px 12px; font-size:12px; color:var(--txt-2); cursor:pointer;
 }
 .pill:hover{ border-color:var(--line-strong); }
+/* 纯状态展示组件（不可点）：就绪=绿，运行中=红 */
 .run-state{
   display:flex; align-items:center; gap:9px; height:30px; color:var(--ok);
   font-weight:600; font-size:12px; border:none; background:transparent;
-  padding:0; font-family:inherit; cursor:pointer; line-height:1;
+  padding:0; font-family:inherit; cursor:default; line-height:1;
 }
 .run-state .dot{
-  width:9px; height:9px; border-radius:50%; background:var(--ok);
+  width:9px; height:9px; border-radius:50%; background:var(--ok); flex:0 0 auto;
-  flex:0 0 auto; transition:box-shadow .15s;
 }
-.run-state:hover .dot{ box-shadow:0 0 0 7px var(--ok-ring); }
+.run-state.busy{ color:var(--danger); }
-.run-state.stopped{ color:var(--danger); }
+.run-state.busy .dot{ background:var(--danger-dot); }
-.run-state.stopped .dot{ background:var(--danger-dot); border-radius:2px; }
-.run-state.stopped:hover .dot{ box-shadow:0 0 0 7px var(--danger-ring); }
 .link{ color:var(--blue); cursor:pointer; }
 .muted{ color:var(--muted); }
 .ic-btn{
@@ -808,6 +806,14 @@ html[data-boot-has-sessions] .chat-start{ display:none !important; }
   animation:ga-spin .65s linear infinite;
 }
 .send svg{ width:15px; height:15px; }
+/* 运行中：发送键变红色停止键（点击=暂停当前回合）。回车仍走发送（打断重发）。 */
+.send.is-stop{ background:var(--danger); cursor:pointer; }
+.send.is-stop:hover{ background:var(--danger-dot); }
+.send.is-stop svg{ display:none; }
+.send.is-stop::after{
+  content:''; width:12px; height:12px; border-radius:3px;
+  background:var(--on-accent);
+}
 
 /* ============ ④ 右侧会话面板 ============ */
 .rp-toggle, .sb-toggle{