feat: fix settings header overlap, redesign pattern editor

- Fix SettingsPanel and PatternEditor headers with pt-12 to clear
  the title bar overlay zone
- Replace mode dropdown with visual mode selector cards showing
  icon, description, and inline flow diagrams for each pattern
- Add flow pill diagrams (Single, Sequential, Concurrent, Handoff,
  Group Chat, Magentic) illustrating how agents interact
- Add reasoning effort selector (Low/Medium/High/Maximum) to
  agent cards — previously not exposed in the editor
- Improve agent cards with numbered badges and 3-column layout
  for name, model, and reasoning fields

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/renderer/components/PatternEditor.tsx

@@ -1,6 +1,26 @@
-import { AlertCircle, CheckCircle, ChevronLeft, Plus, Trash2 } from 'lucide-react';
+import { useState, type ReactNode } from 'react';
+import {
+  AlertCircle,
+  ArrowLeftRight,
+  CheckCircle,
+  ChevronLeft,
+  GitFork,
+  ListOrdered,
+  Lock,
+  MessageSquare,
+  Plus,
+  Trash2,
+  Users,
+  type LucideIcon,
+} from 'lucide-react';
 
-import { validatePatternDefinition, type OrchestrationMode, type PatternDefinition } from '@shared/domain/pattern';
+import {
+  validatePatternDefinition,
+  type OrchestrationMode,
+  type PatternDefinition,
+  type ReasoningEffort,
+  type PatternAgentDefinition,
+} from '@shared/domain/pattern';
 
 interface PatternEditorProps {
   pattern: PatternDefinition;
@@ -11,7 +31,131 @@ interface PatternEditorProps {
   onBack: () => void;
 }
 
-const modes: OrchestrationMode[] = ['single', 'sequential', 'concurrent', 'handoff', 'group-chat', 'magentic'];
+const reasoningEfforts: { value: ReasoningEffort; label: string }[] = [
+  { value: 'low', label: 'Low' },
+  { value: 'medium', label: 'Medium' },
+  { value: 'high', label: 'High' },
+  { value: 'xhigh', label: 'Maximum' },
+];
+
+interface ModeInfo {
+  icon: LucideIcon;
+  label: string;
+  description: string;
+}
+
+const modeInfo: Record<OrchestrationMode, ModeInfo> = {
+  single: {
+    icon: MessageSquare,
+    label: 'Single',
+    description: 'Direct conversation with one agent',
+  },
+  sequential: {
+    icon: ListOrdered,
+    label: 'Sequential',
+    description: 'Agents process in order, each refining the result',
+  },
+  concurrent: {
+    icon: GitFork,
+    label: 'Concurrent',
+    description: 'Multiple agents respond in parallel',
+  },
+  handoff: {
+    icon: ArrowLeftRight,
+    label: 'Handoff',
+    description: 'Triage agent routes to specialists',
+  },
+  'group-chat': {
+    icon: Users,
+    label: 'Group Chat',
+    description: 'Agents iterate in managed round-robin',
+  },
+  magentic: {
+    icon: Lock,
+    label: 'Magentic',
+    description: 'Not yet available in .NET',
+  },
+};
+
+function FlowPill({ children, variant = 'agent' }: { children: ReactNode; variant?: 'user' | 'agent' }) {
+  return (
+    <span
+      className={`inline-flex rounded px-1.5 py-0.5 text-[9px] font-semibold leading-none ${
+        variant === 'user'
+          ? 'bg-indigo-500/20 text-indigo-400'
+          : 'bg-zinc-700/60 text-zinc-400'
+      }`}
+    >
+      {children}
+    </span>
+  );
+}
+
+function FlowArrow({ label }: { label?: string }) {
+  return <span className="text-[10px] leading-none text-zinc-600">{label ?? '→'}</span>;
+}
+
+function ModeFlowDiagram({ mode }: { mode: OrchestrationMode }) {
+  switch (mode) {
+    case 'single':
+      return (
+        <div className="flex items-center gap-1">
+          <FlowPill variant="user">You</FlowPill>
+          <FlowArrow />
+          <FlowPill>Agent</FlowPill>
+          <FlowArrow />
+          <FlowPill variant="user">You</FlowPill>
+        </div>
+      );
+    case 'sequential':
+      return (
+        <div className="flex items-center gap-1">
+          <FlowPill>A₁</FlowPill>
+          <FlowArrow />
+          <FlowPill>A₂</FlowPill>
+          <FlowArrow />
+          <FlowPill>A₃</FlowPill>
+        </div>
+      );
+    case 'concurrent':
+      return (
+        <div className="flex items-center gap-1">
+          <FlowPill variant="user">You</FlowPill>
+          <FlowArrow />
+          <div className="flex gap-0.5">
+            <FlowPill>A₁</FlowPill>
+            <FlowPill>A₂</FlowPill>
+            <FlowPill>A₃</FlowPill>
+          </div>
+          <FlowArrow />
+          <FlowPill variant="user">You</FlowPill>
+        </div>
+      );
+    case 'handoff':
+      return (
+        <div className="flex items-center gap-1">
+          <FlowPill>Triage</FlowPill>
+          <FlowArrow label="⇄" />
+          <FlowPill>S₁</FlowPill>
+          <FlowPill>S₂</FlowPill>
+        </div>
+      );
+    case 'group-chat':
+      return (
+        <div className="flex items-center gap-1">
+          <FlowPill>A₁</FlowPill>
+          <FlowArrow label="⇄" />
+          <FlowPill>A₂</FlowPill>
+          <FlowArrow label="⇄" />
+          <FlowPill>A₃</FlowPill>
+        </div>
+      );
+    case 'magentic':
+      return <span className="text-[10px] italic text-zinc-700">Coming soon</span>;
+    default:
+      return null;
+  }
+}
 
 function InputField({
   label,
@@ -53,7 +197,7 @@ function InputField({
 export function PatternEditor({ pattern, isBuiltin, onChange, onDelete, onSave, onBack }: PatternEditorProps) {
   const issues = validatePatternDefinition(pattern);
 
-  function updateAgent(agentId: string, patch: Record<string, string>) {
+  function updateAgent(agentId: string, patch: Partial<PatternAgentDefinition>) {
     onChange({
       ...pattern,
       agents: pattern.agents.map((a) => (a.id === agentId ? { ...a, ...patch } : a)),
@@ -62,8 +206,8 @@ export function PatternEditor({ pattern, isBuiltin, onChange, onDelete, onSave,
 
   return (
     <div className="flex h-full flex-col">
-      {/* Header */}
-      <div className="flex items-center justify-between border-b border-zinc-800 px-6 py-3">
+      {/* Header — top padding clears the title bar overlay zone */}
+      <div className="flex items-center justify-between border-b border-zinc-800 px-6 pb-3 pt-12">
         <div className="flex items-center gap-3">
           <button
             className="flex size-8 items-center justify-center rounded-lg text-zinc-400 transition hover:bg-zinc-800 hover:text-zinc-200"
@@ -104,7 +248,7 @@ export function PatternEditor({ pattern, isBuiltin, onChange, onDelete, onSave,
 
       {/* Body */}
       <div className="flex-1 overflow-y-auto px-6 py-5">
-        <div className="mx-auto max-w-2xl space-y-6">
+        <div className="mx-auto max-w-2xl space-y-8">
           {/* Validation banner */}
           {issues.length > 0 ? (
             <div className="space-y-2">
@@ -129,35 +273,17 @@ export function PatternEditor({ pattern, isBuiltin, onChange, onDelete, onSave,
             </div>
           )}
 
-          {/* Basic fields */}
+          {/* Name + description */}
           <section className="space-y-4">
             <h4 className="text-[12px] font-semibold uppercase tracking-wider text-zinc-500">
               General
             </h4>
-            <div className="grid gap-4 sm:grid-cols-2">
-              <InputField
-                label="Name"
-                onChange={(v) => onChange({ ...pattern, name: v })}
-                placeholder="Pattern name"
-                value={pattern.name}
-              />
-              <label className="block space-y-1.5">
-                <span className="text-[12px] font-medium text-zinc-400">Mode</span>
-                <select
-                  className="w-full rounded-lg border border-zinc-700 bg-zinc-900 px-3 py-2 text-[13px] text-zinc-100 outline-none transition focus:border-indigo-500/50"
-                  onChange={(e) =>
-                    onChange({ ...pattern, mode: e.target.value as OrchestrationMode })
-                  }
-                  value={pattern.mode}
-                >
-                  {modes.map((m) => (
-                    <option key={m} value={m}>
-                      {m}
-                    </option>
-                  ))}
-                </select>
-              </label>
-            </div>
+            <InputField
+              label="Name"
+              onChange={(v) => onChange({ ...pattern, name: v })}
+              placeholder="Pattern name"
+              value={pattern.name}
+            />
             <InputField
               label="Description"
               multiline
@@ -167,6 +293,56 @@ export function PatternEditor({ pattern, isBuiltin, onChange, onDelete, onSave,
             />
           </section>
 
+          {/* Mode selector cards */}
+          <section className="space-y-4">
+            <h4 className="text-[12px] font-semibold uppercase tracking-wider text-zinc-500">
+              Orchestration Mode
+            </h4>
+            <div className="grid grid-cols-2 gap-2">
+              {(Object.keys(modeInfo) as OrchestrationMode[]).map((mode) => {
+                const info = modeInfo[mode];
+                const Icon = info.icon;
+                const selected = pattern.mode === mode;
+                const disabled = mode === 'magentic';
+
+                return (
+                  <button
+                    className={`flex flex-col rounded-xl border p-3 text-left transition ${
+                      selected
+                        ? 'border-indigo-500/40 bg-indigo-500/5 ring-1 ring-indigo-500/20'
+                        : disabled
+                          ? 'cursor-not-allowed border-zinc-800/50 opacity-40'
+                          : 'border-zinc-800 hover:border-zinc-700 hover:bg-zinc-900/60'
+                    }`}
+                    disabled={disabled}
+                    key={mode}
+                    onClick={() => onChange({ ...pattern, mode })}
+                    type="button"
+                  >
+                    <div className="flex items-center gap-2">
+                      <Icon
+                        className={`size-4 ${selected ? 'text-indigo-400' : 'text-zinc-500'}`}
+                      />
+                      <span
+                        className={`text-[12px] font-semibold ${
+                          selected ? 'text-indigo-200' : 'text-zinc-300'
+                        }`}
+                      >
+                        {info.label}
+                      </span>
+                    </div>
+                    <p className="mt-1 text-[11px] leading-snug text-zinc-500">
+                      {info.description}
+                    </p>
+                    <div className="mt-2.5">
+                      <ModeFlowDiagram mode={mode} />
+                    </div>
+                  </button>
+                );
+              })}
+            </div>
+          </section>
+
           {/* Agents */}
           <section className="space-y-4">
             <div className="flex items-center justify-between">
@@ -186,6 +362,7 @@ export function PatternEditor({ pattern, isBuiltin, onChange, onDelete, onSave,
                         description: '',
                         instructions: '',
                         model: 'gpt-5.4',
+                        reasoningEffort: 'high',
                       },
                     ],
                   })
@@ -193,7 +370,7 @@ export function PatternEditor({ pattern, isBuiltin, onChange, onDelete, onSave,
                 type="button"
               >
                 <Plus className="size-3" />
-                Add
+                Add agent
               </button>
             </div>
 
@@ -204,12 +381,17 @@ export function PatternEditor({ pattern, isBuiltin, onChange, onDelete, onSave,
                   key={agent.id}
                 >
                   <div className="mb-3 flex items-center justify-between">
-                    <span className="text-[12px] font-medium text-zinc-500">
-                      Agent {index + 1}
-                    </span>
+                    <div className="flex items-center gap-2">
+                      <span className="flex size-5 items-center justify-center rounded bg-zinc-700/60 text-[10px] font-bold text-zinc-400">
+                        {index + 1}
+                      </span>
+                      <span className="text-[12px] font-medium text-zinc-300">
+                        {agent.name || 'Unnamed agent'}
+                      </span>
+                    </div>
                     {pattern.agents.length > 1 && (
                       <button
-                        className="text-[12px] text-zinc-600 transition hover:text-red-400"
+                        className="flex items-center gap-1 text-[12px] text-zinc-600 transition hover:text-red-400"
                         onClick={() =>
                           onChange({
                             ...pattern,
@@ -218,11 +400,13 @@ export function PatternEditor({ pattern, isBuiltin, onChange, onDelete, onSave,
                         }
                         type="button"
                       >
+                        <Trash2 className="size-3" />
                         Remove
                       </button>
                     )}
                   </div>
-                  <div className="grid gap-3 sm:grid-cols-2">
+
+                  <div className="grid gap-3 sm:grid-cols-3">
                     <InputField
                       label="Name"
                       onChange={(v) => updateAgent(agent.id, { name: v })}
@@ -234,22 +418,41 @@ export function PatternEditor({ pattern, isBuiltin, onChange, onDelete, onSave,
                       placeholder="e.g. gpt-5.4"
                       value={agent.model}
                     />
-                    <div className="sm:col-span-2">
-                      <InputField
-                        label="Description"
-                        onChange={(v) => updateAgent(agent.id, { description: v })}
-                        value={agent.description}
-                      />
-                    </div>
-                    <div className="sm:col-span-2">
-                      <InputField
-                        label="Instructions"
-                        multiline
-                        onChange={(v) => updateAgent(agent.id, { instructions: v })}
-                        placeholder="System prompt for this agent..."
-                        value={agent.instructions}
-                      />
-                    </div>
+                    <label className="block space-y-1.5">
+                      <span className="text-[12px] font-medium text-zinc-400">Reasoning</span>
+                      <select
+                        className="w-full rounded-lg border border-zinc-700 bg-zinc-900 px-3 py-2 text-[13px] text-zinc-100 outline-none transition focus:border-indigo-500/50"
+                        onChange={(e) =>
+                          updateAgent(agent.id, {
+                            reasoningEffort: e.target.value as ReasoningEffort,
+                          })
+                        }
+                        value={agent.reasoningEffort ?? 'high'}
+                      >
+                        {reasoningEfforts.map((r) => (
+                          <option key={r.value} value={r.value}>
+                            {r.label}
+                          </option>
+                        ))}
+                      </select>
+                    </label>
+                  </div>
+                  <div className="mt-3">
+                    <InputField
+                      label="Description"
+                      onChange={(v) => updateAgent(agent.id, { description: v })}
+                      placeholder="What this agent does..."
+                      value={agent.description}
+                    />
+                  </div>
+                  <div className="mt-3">
+                    <InputField
+                      label="Instructions"
+                      multiline
+                      onChange={(v) => updateAgent(agent.id, { instructions: v })}
+                      placeholder="System prompt for this agent..."
+                      value={agent.instructions}
+                    />
                   </div>
                 </div>
               ))}

src/renderer/components/SettingsPanel.tsx

@@ -54,8 +54,8 @@ export function SettingsPanel({
 
   return (
     <div className="fixed inset-0 z-50 flex flex-col bg-[var(--color-surface-0)]">
-      {/* Header */}
-      <div className="flex items-center justify-between border-b border-[var(--color-border)] px-6 py-3">
+      {/* Header — top padding clears the title bar overlay zone */}
+      <div className="flex items-center justify-between border-b border-[var(--color-border)] px-6 pb-3 pt-12">
         <h2 className="text-sm font-semibold text-zinc-100">Settings</h2>
         <button
           className="flex size-8 items-center justify-center rounded-lg text-zinc-400 transition hover:bg-zinc-800 hover:text-zinc-200"