feat: composer-centric UI refresh + Hermes Control Center (v0.50.0, closes #242)

* Polish workspace panel behavior and app dialogs

* Replace remaining emoji UI glyphs with Lucide icons

* Redesign composer footer around model and context controls

Move the model selector into the composer footer, replace the linear context pill with a compact circular badge plus tooltip, and remove the redundant topbar model pill.

Design credit and inspiration: Theo / T3 Code.
Reference implementation: https://github.com/pingdotgg/t3code/

* Remove obsolete activity bar

Drop the old activity bar, keep turn-scoped state in the composer footer, and route remaining non-chat status messages through toasts.

This leaves live tool cards and the message timeline as the primary progress UI, with the composer owning stop/cancel and brief turn status.

* Move workspace and model switching into composer footer

* Move profile switching into composer footer

* Refactor Hermes control center UI

* Redesign control center settings modal layout

Widen the modal to 860px, simplify the tab list to icon+label rows,
stretch the tab column's divider to full height, lock the panel to a
fixed height so switching tabs no longer resizes the outer shell, and
always open on the Conversation tab.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Put session item actions in a dropdown

* Use Hermes mark in sidebar control button

* Reset control center section on close

* Drop session-item left border indicator

Remove the left-border accent used for active, CLI, and project rows —
each state already has a dedicated cue (gold fill, cli badge, project
dot), so the border was redundant. Fully round the row, add 2px
bottom spacing between rows, and strip the matching JS/CSS overrides.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Increase session search input vertical padding

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Normalise odd pixel values across UI

Snap padding, gap, and border-radius values to the 2/4/6/8/10/12 grid
across composer chips, sidebar panels, cron list, settings, approval
buttons, dropdowns, and inline message edit — eliminating the 7/9/11px
drift that was making sibling elements feel subtly misaligned.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Add missing #btnMobileFiles button and .mobile-files-btn CSS (for mobile QA suite)

The mobile layout regression suite (test_mobile_layout.py) requires:
- #btnMobileFiles onclick=toggleMobileFiles() in topbar chips
- .mobile-files-btn CSS rules for responsive show/hide at 640/900px breakpoints

Also adds max-width guard to .profile-dropdown to prevent clipping at narrow viewports.

* Improve composer footer mobile responsiveness and UX

- Collapse composer chips to icon-only at <=400px viewports
- Add model chip icon (CPU) so it remains tappable when labels are hidden
- Show send button always (disabled state when empty, hidden during streaming)
- Show context usage indicator on session load, not just after streaming
- Add cancel status fallback timeout to prevent stale "Cancelling..." text
- Update tests to match new send button and busy state behavior

* Fix duplicate files button and broken workspace close on mobile

Remove redundant #btnMobileFiles button that duplicated #btnWorkspacePanelToggle
in the mobile topbar. Fix workspace panel close button calling undefined
closeMobileFiles() — now calls closeWorkspacePanel().

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Fix model chip icon vertical alignment in composer footer

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Fix workspace toggle button hidden on desktop by conflicting CSS class

Remove mobile-files-btn class from #btnWorkspacePanelToggle — its
display:none!important rule was overriding workspace-toggle-btn visibility
on non-mobile viewports.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Fix session actions dots button inaccessible on mobile sidebar

Always show the session actions trigger on mobile (no hover state on
touch devices) and restore right padding so text truncates with
ellipsis before the dots icon.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Fix composer footer manage links not opening sidebar panel

The "Manage profiles" and "Manage workspaces" links in the composer
footer dropdowns called switchPanel() which only changes the active
panel content but doesn't open the sidebar. Replaced with
mobileSwitchPanel() which also opens the sidebar so the panel is
actually visible.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Widen icon-only composer chips breakpoint from 400px to 768px

Move the icon-only chip styling up into the existing max-width:768px
media query so chips collapse to icon-only on tablets too, preventing
composer footer overflow on mid-size screens.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Fix composer-left vertical scrollbar by setting overflow-y:hidden

When overflow-x is set to auto, the CSS spec implicitly changes
overflow-y from visible to auto, allowing a vertical scrollbar to
appear from slight chip padding/border overflow. Explicitly set
overflow-y:hidden to prevent this.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: resolve rebase conflicts and fix control center test assertions

- Resolved 4 conflicts during rebase onto master (workspace.js,
  boot.js, index.html, test_sprint34.py)
- Fixed test_sprint34.py: _controlSection -> _settingsSection,
  cc-tab -> settings-tabs (matching actual implementation)
- Fixed quoting syntax error in test assertion

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: update version badge in System tab to v0.49.4

* docs: update README and CHANGELOG for v0.50.0 UI refresh, bump version badge

---------

Co-authored-by: Aron Prins <pwf.aron@gmail.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-authored-by: Nathan Esquenazi <nesquena@gmail.com>

static/messages.js

@@ -21,22 +21,22 @@ async function send(){
 
   const activeSid=S.session.session_id;
 
-  setStatus(S.pendingFiles&&S.pendingFiles.length?'Uploading…':'Sending…');
+  setComposerStatus(S.pendingFiles&&S.pendingFiles.length?'Uploading…':'');
   let uploaded=[];
   try{uploaded=await uploadPendingFiles();}
-  catch(e){if(!text){setStatus(`Upload error: ${e.message}`);return;}}
+  catch(e){if(!text){setComposerStatus(`Upload error: ${e.message}`);return;}}
 
   let msgText=text;
   if(uploaded.length&&!msgText)msgText=`I've uploaded ${uploaded.length} file(s): ${uploaded.join(', ')}`;
   else if(uploaded.length)msgText=`${text}\n\n[Attached files: ${uploaded.join(', ')}]`;
-  if(!msgText){setStatus('Nothing to send');return;}
+  if(!msgText){setComposerStatus('Nothing to send');return;}
 
   $('msg').value='';autoResize();
   const displayText=text||(uploaded.length?`Uploaded: ${uploaded.join(', ')}`:'(file upload)');
   const userMsg={role:'user',content:displayText,attachments:uploaded.length?uploaded:undefined,_ts:Date.now()/1000};
   S.toolCalls=[];  // clear tool calls from previous turn
   clearLiveToolCards();  // clear any leftover live cards from last turn
-  S.messages.push(userMsg);renderMessages();appendThinking();setBusy(true);  // activity bar shown via setBusy
+  S.messages.push(userMsg);renderMessages();appendThinking();setBusy(true);
   INFLIGHT[activeSid]={messages:[...S.messages],uploaded};
   startApprovalPolling(activeSid);
   S.activeStreamId = null;  // will be set after stream starts
@@ -76,7 +76,7 @@ async function send(){
     // Only hide approval card if it belongs to the session that just finished
     if(!_approvalSessionId || _approvalSessionId===activeSid) hideApprovalCard(true);removeThinking();
     S.messages.push({role:'assistant',content:`**Error:** ${e.message}`});
-    renderMessages();setBusy(false);setStatus('Error: '+e.message);
+    renderMessages();setBusy(false);setComposerStatus(`Error: ${e.message}`);
     return;
   }
 
@@ -156,9 +156,6 @@ async function send(){
 
     source.addEventListener('tool',e=>{
       const d=JSON.parse(e.data);
-      if(S.session&&S.session.session_id===activeSid){
-        setStatus(`${d.name}${d.preview?' · '+d.preview.slice(0,55):''}`);
-      }
       if(!S.session||S.session.session_id!==activeSid) return;
       removeThinking();
       const oldRow=$('toolRunningRow');if(oldRow)oldRow.remove();
@@ -207,6 +204,7 @@ async function send(){
         syncTopbar();renderMessages();loadDir('.');
       }
       renderSessionList();setBusy(false);setStatus('');
+      setComposerStatus('');
       playNotificationSound();
       sendBrowserNotification('Response complete',assistantText?assistantText.slice(0,100):'Task finished');
     });
@@ -247,7 +245,7 @@ async function send(){
         try{const d=JSON.parse(e.data);trackBackgroundError(activeSid,_errTitle,d.message||'Error');}
         catch(_){trackBackgroundError(activeSid,_errTitle,'Error');}
       }
-      if(!S.session||!INFLIGHT[S.session.session_id]){setBusy(false);setStatus('');}
+      if(!S.session||!INFLIGHT[S.session.session_id]){setBusy(false);setComposerStatus('');}
     });
 
     source.addEventListener('warning',e=>{
@@ -256,9 +254,9 @@ async function send(){
       try{
         const d=JSON.parse(e.data);
         // Show as a small inline notice, not a full error
-        setStatus(`${d.message||'Warning'}`);
+        setComposerStatus(`${d.message||'Warning'}`);
         // If it's a fallback notice, show it briefly then clear
-        if(d.type==='fallback') setTimeout(()=>setStatus(''),4000);
+        if(d.type==='fallback') setTimeout(()=>setComposerStatus(''),4000);
       }catch(_){}
     });
 
@@ -267,12 +265,12 @@ async function send(){
       // Attempt one reconnect if the stream is still active server-side
       if(!_reconnectAttempted && streamId){
         _reconnectAttempted=true;
-        setStatus('Connection lost \u2014 reconnecting\u2026');
+        setComposerStatus('Reconnecting…');
         setTimeout(async()=>{
           try{
             const st=await api(`/api/chat/stream/status?stream_id=${encodeURIComponent(streamId)}`);
             if(st.active){
-              setStatus('Reconnected');
+              setComposerStatus('Reconnected');
               _wireSSE(new EventSource(new URL(`/api/chat/stream?stream_id=${encodeURIComponent(streamId)}`,location.origin).href,{withCredentials:true}));
               return;
             }
@@ -296,8 +294,7 @@ async function send(){
         S.messages.push({role:'assistant',content:'*Task cancelled.*'});renderMessages();
       }
       renderSessionList();
-      // Always clear busy state and status when cancel event is received
-      setBusy(false);setStatus('');
+      if(!S.session||!INFLIGHT[S.session.session_id]){setBusy(false);setComposerStatus('');}
     });
   }
 
@@ -316,7 +313,7 @@ async function send(){
         trackBackgroundError(activeSid,_errTitle,'Connection lost');
       }
     }
-    if(!S.session||!INFLIGHT[S.session.session_id]){setBusy(false);setStatus('Error: Connection lost');}
+    if(!S.session||!INFLIGHT[S.session.session_id]){setBusy(false);setComposerStatus('');}
   }
 
   _wireSSE(new EventSource(new URL(`/api/chat/stream?stream_id=${encodeURIComponent(streamId)}`,location.origin).href,{withCredentials:true}));