fix: apply_update concurrency lock, boot.js settings-fail guard, dead workspace code, test_updates URL param

- api/updates.py: add _apply_lock to prevent concurrent stash/pull/pop
- static/boot.js: set check_for_updates:false on settings fetch failure
- static/panels.js: remove dead settingsWorkspace references (element removed from HTML)
- api/routes.py + static/boot.js: add ?test_updates=1 URL param for testing banner
  without being behind on git (localhost-only simulate endpoint)

api/routes.py

@@ -231,7 +231,15 @@ def handle_get(handler, parsed) -> bool:
         settings = load_settings()
         if not settings.get('check_for_updates', True):
             return j(handler, {'disabled': True})
-        force = parse_qs(parsed.query).get('force', ['0'])[0] == '1'
+        qs = parse_qs(parsed.query)
+        force = qs.get('force', ['0'])[0] == '1'
+        # ?simulate=1 returns fake behind counts for UI testing (localhost only)
+        if qs.get('simulate', ['0'])[0] == '1' and handler.client_address[0] == '127.0.0.1':
+            return j(handler, {
+                'webui': {'name': 'webui', 'behind': 3, 'current_sha': 'abc1234', 'latest_sha': 'def5678', 'branch': 'master'},
+                'agent': {'name': 'agent', 'behind': 1, 'current_sha': 'aaa0001', 'latest_sha': 'bbb0002', 'branch': 'master'},
+                'checked_at': 0,
+            })
         from api.updates import check_for_updates
         return j(handler, check_for_updates(force=force))
 

api/updates.py

@@ -24,6 +24,7 @@ except ImportError:
 _update_cache = {'webui': None, 'agent': None, 'checked_at': 0}
 _cache_lock = threading.Lock()
 _check_in_progress = False
+_apply_lock = threading.Lock()   # prevents concurrent stash/pull/pop on same repo
 CACHE_TTL = 1800  # 30 minutes
 
 
@@ -108,6 +109,16 @@ def check_for_updates(force=False):
 
 def apply_update(target):
     """Stash, pull --ff-only, pop for the given target repo."""
+    if not _apply_lock.acquire(blocking=False):
+        return {'ok': False, 'message': 'Update already in progress'}
+    try:
+        return _apply_update_inner(target)
+    finally:
+        _apply_lock.release()
+
+
+def _apply_update_inner(target):
+    """Inner implementation of apply_update, called under _apply_lock."""
     if target == 'webui':
         path = REPO_ROOT
     elif target == 'agent':

static/boot.js

@@ -309,10 +309,13 @@ document.querySelectorAll('.suggestion').forEach(btn=>{
 (async()=>{
   // Load send key preference
   let _bootSettings={};
-  try{const s=await api('/api/settings');_bootSettings=s;window._sendKey=s.send_key||'enter';window._showTokenUsage=!!s.show_token_usage;window._showCliSessions=!!s.show_cli_sessions;const _theme=s.theme||'dark';document.documentElement.dataset.theme=_theme;localStorage.setItem('hermes-theme',_theme);}catch(e){window._sendKey='enter';window._showTokenUsage=false;window._showCliSessions=false;}
+  try{const s=await api('/api/settings');_bootSettings=s;window._sendKey=s.send_key||'enter';window._showTokenUsage=!!s.show_token_usage;window._showCliSessions=!!s.show_cli_sessions;const _theme=s.theme||'dark';document.documentElement.dataset.theme=_theme;localStorage.setItem('hermes-theme',_theme);}catch(e){window._sendKey='enter';window._showTokenUsage=false;window._showCliSessions=false;_bootSettings={check_for_updates:false};}
   // Non-blocking update check (fire-and-forget, once per tab session)
-  if(_bootSettings.check_for_updates!==false&&!sessionStorage.getItem('hermes-update-checked')&&!sessionStorage.getItem('hermes-update-dismissed')){
-    api('/api/updates/check').then(d=>{sessionStorage.setItem('hermes-update-checked','1');if((d.webui&&d.webui.behind>0)||(d.agent&&d.agent.behind>0))_showUpdateBanner(d);}).catch(()=>{});
+  // ?test_updates=1 in URL forces banner display for testing (bypasses sessionStorage guards)
+  const _testUpdates=new URLSearchParams(location.search).get('test_updates')==='1';
+  if(_testUpdates||(_bootSettings.check_for_updates!==false&&!sessionStorage.getItem('hermes-update-checked')&&!sessionStorage.getItem('hermes-update-dismissed'))){
+    const _checkUrl='/api/updates/check'+(_testUpdates?'?simulate=1':'');
+    api(_checkUrl).then(d=>{if(!_testUpdates)sessionStorage.setItem('hermes-update-checked','1');if((d.webui&&d.webui.behind>0)||(d.agent&&d.agent.behind>0))_showUpdateBanner(d);}).catch(()=>{});
   }
   // Fetch active profile
   try{const p=await api('/api/profile/active');S.activeProfile=p.name||'default';}catch(e){S.activeProfile='default';}

static/panels.js

@@ -995,21 +995,6 @@ async function loadSettingsPanel(){
       modelSel.value=settings.default_model||'';
       modelSel.addEventListener('change',_markSettingsDirty,{once:false});
     }
-    // Populate workspace dropdown from /api/workspaces
-    const wsSel=$('settingsWorkspace');
-    if(wsSel){
-      wsSel.innerHTML='';
-      try{
-        const wsData=await api('/api/workspaces');
-        for(const w of (wsData.workspaces||[])){
-          const opt=document.createElement('option');
-          opt.value=w.path;opt.textContent=w.name||w.path;
-          wsSel.appendChild(opt);
-        }
-      }catch(e){}
-      wsSel.value=settings.default_workspace||'';
-      wsSel.addEventListener('change',_markSettingsDirty,{once:false});
-    }
     // Send key preference
     const sendKeySel=$('settingsSendKey');
     if(sendKeySel){sendKeySel.value=settings.send_key||'enter';sendKeySel.addEventListener('change',_markSettingsDirty,{once:false});}
@@ -1043,7 +1028,6 @@ async function loadSettingsPanel(){
 
 async function saveSettings(andClose){
   const model=($('settingsModel')||{}).value;
-  const workspace=($('settingsWorkspace')||{}).value;
   const sendKey=($('settingsSendKey')||{}).value;
   const showTokenUsage=!!($('settingsShowTokenUsage')||{}).checked;
   const showCliSessions=!!($('settingsShowCliSessions')||{}).checked;
@@ -1051,7 +1035,7 @@ async function saveSettings(andClose){
   const theme=($('settingsTheme')||{}).value||'dark';
   const body={};
   if(model) body.default_model=model;
-  if(workspace) body.default_workspace=workspace;
+
   if(sendKey) body.send_key=sendKey;
   body.theme=theme;
   body.show_token_usage=showTokenUsage;