fix: Pi harness - dynamic models, correct RPC protocol, proper event handling

Backend:
- /api/pi/models now calls 'pi --list-models' with stored API keys
- pi-bridge.ts: callback-based event handling (matches pi-monorepo)
- pi-bridge.ts: correct RPC format (type: 'prompt' not jsonrpc)
- pi-bridge.ts: pass API keys to Pi process env
- websocket.ts: event handler runs in background, no blocking
- rest.ts: fix user home path (getHomeDir instead of hardcoded)

Frontend:
- Fix /api/ double prefix in useChatSessions, useChatGroups, useModels
- Add PROVIDER_DISPLAY mapping in SystemSettings.tsx
- Provider tabs show friendly names (e.g., 'OpenCode Zen')

UI (from previous session):
- Grouped session list with collapsible folders
- CreateGroupDialog, GroupContextMenu, SessionContextMenu components

src/apps/officer-web/Screens/Dashboard/Settings/SystemSettings.tsx

@@ -21,6 +21,27 @@ import type { UserSettings } from '@/state/types/user-settings';
 import { AIHarnessesSection } from './ServerSettings/AIHarnessesSection';
 import { RUN_COMMAND_CHANNEL, type RunCommandState } from './ServerSettings/run-command-channel';
 
+const PROVIDER_DISPLAY: Record<string, string> = {
+  anthropic: 'Anthropic',
+  openai: 'OpenAI',
+  opencode: 'OpenCode Zen',
+  google: 'Google',
+  groq: 'Groq',
+  mistral: 'Mistral',
+  xai: 'xAI',
+  openrouter: 'OpenRouter',
+  huggingface: 'Hugging Face',
+  'github-copilot': 'GitHub Copilot',
+  minimax: 'MiniMax',
+  bedrock: 'Amazon Bedrock',
+  'google-vertex': 'Google Vertex AI',
+  'azure-openai': 'Azure OpenAI',
+};
+
+function displayProviderName(provider: string): string {
+  return PROVIDER_DISPLAY[provider] ?? provider;
+}
+
 const groups: SettingsSectionGroup[] = [
   {
     label: 'AI',
@@ -381,7 +402,7 @@ function ModelVisibilitySection() {
                 : 'text-duck-dark/50 dark:text-foreground/50 hover:text-duck-dark dark:hover:text-foreground hover:bg-duck-dark/5 dark:hover:bg-foreground/5'
             }`}
           >
-            {p}
+            {displayProviderName(p)}
           </button>
         ))}
       </div>