Merge plan and panel toggles into one composer button

The composer had two separate mode buttons (plan + panel). Fold them into a
single #planModeBtn that cycles through every operating mode in one place:
Off -> Plan -> Fusion -> MoA -> Off. Cleaner UI, one affordance instead of two.

Plan stays transient (reset on session switch, never persisted) while
Fusion/MoA persist to the session via apiUpdateSession({multiModelMode}) and
are read server-side from ctx.MultiModelMode. The compat var _planModeActive
is kept in sync (true iff mode === 'plan') so sendMessage and modals.js read
it unchanged. No text label — icon + tint only.

- index.html: drop the separate panel button, reuse #planModeBtn
- chat.css: unified states (plan/fusion/moa tints) on #planModeBtn
- chat.js: cycleCompositeMode / initCompositeMode / _renderCompositeBtn
  replace the split plan/panel functions
- chat-page.js: single wiring block, init from session.multiModelMode
- ARCHITECTURE_QUICK.md: document the unified toggle

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

wwwroot/css/chat.css

@@ -436,12 +436,22 @@
   color: var(--dangerous);
 }
 
-/* Plan Mode Toggle */
+/* Unified Modus-Toggle: Aus / Plan / Fusion / MoA (ein einziger #planModeBtn) */
 #planModeBtn.plan-mode-active {
   color: var(--primary);
   background: color-mix(in srgb, var(--primary) 15%, transparent);
   border-radius: var(--border-radius);
 }
+#planModeBtn.panel-mode-fusion {
+  color: var(--primary);
+  background: color-mix(in srgb, var(--primary) 15%, transparent);
+  border-radius: var(--border-radius);
+}
+#planModeBtn.panel-mode-moa {
+  color: var(--primary);
+  background: color-mix(in srgb, var(--primary) 28%, transparent);
+  border-radius: var(--border-radius);
+}
 
 /* Emoji Picker */
 

wwwroot/index.html

@@ -455,7 +455,7 @@
         <input type="file" id="fileInput" accept="image/jpeg,image/png,image/gif,image/webp,application/pdf" multiple hidden>
         <button id="fileBtn" class="icon-btn" title="Datei anhängen"><i class="fa fa-paperclip"></i></button>
         <button id="explorerBtn" class="icon-btn" title="Workspace durchsuchen"><i class="fa fa-folder"></i></button>
-        <button id="planModeBtn" class="icon-btn" title="Plan-Modus umschalten"><i class="fa fa-map"></i></button>
+        <button id="planModeBtn" class="icon-btn" title="Plan-Modus / Panel umschalten"><i class="fa fa-map"></i></button>
         <textarea id="input" placeholder="Nachricht..." rows="1"></textarea>
         <button id="emojiBtn" class="icon-btn" title="Emoji einfügen"><i class="fa fa-smile-o"></i></button>
         <button id="send" class="icon-btn"><i class="fa fa-paper-plane"></i></button>

wwwroot/js/chat.js

@@ -223,20 +223,94 @@ function handleStreamEvent(eventType, data) {
   }
 }
 
-// ── Plan Mode ──
+// ── Unified Modus-Toggle (Aus / Plan / Fusion / MoA) ──
+//
+// Ein einziger Button (#planModeBtn) schaltet zyklisch durch alle Betriebsmodi:
+//   Aus → Plan-Modus → Fusion (Panel) → MoA (Panel) → Aus
+//
+// Plan-Modus ist transient (wird bei Session-Wechsel zurückgesetzt, nie in der Session
+// persistiert). Fusion/MoA werden in der Session persistiert (apiUpdateSession) und
+// server-seitig aus ctx.MultiModelMode gelesen – daher reicht ein PATCH.
+//
+// _planModeActive bleibt als Compat-Variable (sendMessage + modals.js lesen sie direkt).
 
-let _planModeActive = false;
+let _compositeMode = 'off';     // 'off' | 'plan' | 'fusion' | 'moa'
+let _compositeHasAgents = false;
 
-function togglePlanMode() {
-  _planModeActive = !_planModeActive;
+// Compat-Variablen – werden durch cycleCompositeMode / initCompositeMode synchron gehalten
+let _planModeActive = false;    // true genau wenn _compositeMode === 'plan'
+
+const _COMPOSITE_ORDER = ['off', 'plan', 'fusion', 'moa'];
+
+function _renderCompositeBtn() {
   var btn = $('#planModeBtn');
-  if (btn) {
-    btn.classList.toggle('plan-mode-active', _planModeActive);
-    btn.title = _planModeActive ? 'Plan-Modus deaktivieren' : 'Plan-Modus aktivieren';
-  }
+  if (!btn) return;
+  btn.classList.remove('plan-mode-active', 'panel-mode-fusion', 'panel-mode-moa');
+  var icon = btn.querySelector('i');
   var input = $('#input');
-  if (input) {
-    input.placeholder = _planModeActive ? 'Plannen...' : 'Nachricht...';
+  if (_compositeMode === 'plan') {
+    btn.classList.add('plan-mode-active');
+    if (icon) icon.className = 'fa fa-map';
+    btn.title = 'Plan-Modus aktiv · klicken → Fusion';
+    if (input) input.placeholder = 'Planen...';
+  } else if (_compositeMode === 'fusion') {
+    btn.classList.add('panel-mode-fusion');
+    if (icon) icon.className = 'fa fa-users';
+    btn.title = 'Fusion aktiv · klicken → MoA';
+    if (input) input.placeholder = 'Nachricht...';
+  } else if (_compositeMode === 'moa') {
+    btn.classList.add('panel-mode-moa');
+    if (icon) icon.className = 'fa fa-clone';
+    btn.title = 'MoA aktiv · klicken → Aus';
+    if (input) input.placeholder = 'Nachricht...';
+  } else {
+    if (icon) icon.className = 'fa fa-map';
+    btn.title = 'Plan-Modus / Panel umschalten';
+    if (input) input.placeholder = 'Nachricht...';
+  }
+}
+
+// Initialisiert den Button aus der geladenen Session (bei jedem Chat-Wechsel aufrufen).
+// Plan-Modus wird immer auf 'off' zurückgesetzt (transient).
+function initCompositeMode(panelMode, hasAgents) {
+  _compositeHasAgents = !!hasAgents;
+  _compositeMode = (panelMode === 'fusion' || panelMode === 'moa') ? panelMode : 'off';
+  _planModeActive = false;
+  _renderCompositeBtn();
+}
+
+// Schaltet Aus → Plan → Fusion → MoA → Aus durch.
+// Fusion/MoA werden sofort in die Session persistiert; Plan-Modus ist transient (kein Server-Call).
+async function cycleCompositeMode() {
+  var idx = _COMPOSITE_ORDER.indexOf(_compositeMode);
+  _compositeMode = _COMPOSITE_ORDER[(idx + 1) % _COMPOSITE_ORDER.length];
+  _planModeActive = (_compositeMode === 'plan');
+  _renderCompositeBtn();
+
+  // Nur Fusion/MoA/Off brauchen einen Server-Call (Plan ist transient)
+  if (_compositeMode !== 'plan') {
+    var sid = getCurrentSessionId();
+    if (sid) {
+      try {
+        await apiUpdateSession(sid, { multiModelMode: _compositeMode });
+      } catch (e) {
+        console.error('Modus speichern fehlgeschlagen:', e);
+        if (typeof showToast === 'function') showToast('Modus konnte nicht gespeichert werden', 'error');
+        return;
+      }
+    }
+  }
+
+  if (typeof showToast === 'function') {
+    if (_compositeMode === 'off') {
+      showToast('Modus: Aus', 'info');
+    } else if (_compositeMode === 'plan') {
+      showToast('Plan-Modus aktiv', 'info');
+    } else if (!_compositeHasAgents) {
+      showToast('Panel: ' + (_compositeMode === 'moa' ? 'MoA' : 'Fusion') + ' aktiv – aber keine Panel-Agenten konfiguriert (im Session-Bearbeiten festlegen)', 'info');
+    } else {
+      showToast('Panel: ' + (_compositeMode === 'moa' ? 'MoA' : 'Fusion') + ' aktiv', 'success');
+    }
   }
 }
 

wwwroot/js/pages/chat-page.js

@@ -572,13 +572,12 @@ registerPage('chat', {
       });
     }
 
-    // Plan Mode Toggle
-    const planModeBtn = document.getElementById('planModeBtn');
-    if (planModeBtn) {
-      // Plan-Modus bei Session-Wechsel zurücksetzen
-      _planModeActive = false;
-      planModeBtn.classList.remove('plan-mode-active');
-      planModeBtn.addEventListener('click', togglePlanMode);
+    // Unified Modus-Toggle (Aus / Plan / Fusion / MoA) – aus der Session initialisieren
+    const compositeModeBtn = document.getElementById('planModeBtn');
+    if (compositeModeBtn) {
+      const hasPanelAgents = !!(session.panelAgentIds && String(session.panelAgentIds).trim());
+      initCompositeMode(session.multiModelMode, hasPanelAgents);
+      compositeModeBtn.addEventListener('click', cycleCompositeMode);
     }
 
     // File Upload