🎉 Initial commit: PiAgentUI — AI Agent Desktop & Web UI

A professional workspace for AI coding agents with:
- Real-time streaming chat with SSE
- Session management (fork, clone, tree navigation)
- MCP tools browser & metadata panel
- Skills browser (global, project, package sources)
- Voice input & STT provider configuration
- Integrated terminal & file explorer
- Model selector with capability metadata
- Keyboard-first UI with command palette
- 8 languages (en, pt-BR, es, ja, zh-CN, ar, bn, hi)
- Tauri 2 desktop app
- React 19 + TypeScript + Vite 8 + Tailwind CSS 4
- Pi Agent extension runtime

Originally forked from OpenCodeUI, now an independent project.
License: GPL-3.0-only

src/utils/tauri.ts

@@ -0,0 +1,63 @@
+// ============================================
+// Tauri 平台检测 & 工具
+// ============================================
+
+/**
+ * 检测当前是否运行在 Tauri 环境中
+ * 通过检查 window.__TAURI_INTERNALS__ 来判断
+ */
+export function isTauri(): boolean {
+  return typeof window !== 'undefined' && '__TAURI_INTERNALS__' in window
+}
+
+export function isTauriMobile(): boolean {
+  if (!isTauri() || typeof navigator === 'undefined') return false
+  return /Android|iPhone|iPad|iPod/i.test(navigator.userAgent)
+}
+
+export type DesktopPlatform = 'windows' | 'macos' | 'linux' | 'other'
+
+export function getDesktopPlatform(): DesktopPlatform {
+  if (!isTauri() || isTauriMobile() || typeof navigator === 'undefined') return 'other'
+
+  const ua = navigator.userAgent.toLowerCase()
+  if (ua.includes('windows')) return 'windows'
+  if (ua.includes('mac os') || ua.includes('macintosh')) return 'macos'
+  if (ua.includes('linux')) return 'linux'
+  return 'other'
+}
+
+export function usesCustomDesktopTitlebar(): boolean {
+  const platform = getDesktopPlatform()
+  return platform === 'windows' || platform === 'macos'
+}
+
+/** 文件扩展名 → MIME 类型映射 */
+export function extToMime(ext: string): string {
+  const map: Record<string, string> = {
+    // image
+    png: 'image/png',
+    jpg: 'image/jpeg',
+    jpeg: 'image/jpeg',
+    gif: 'image/gif',
+    webp: 'image/webp',
+    bmp: 'image/bmp',
+    svg: 'image/svg+xml',
+    // pdf
+    pdf: 'application/pdf',
+    // audio
+    mp3: 'audio/mpeg',
+    wav: 'audio/wav',
+    ogg: 'audio/ogg',
+    flac: 'audio/flac',
+    aac: 'audio/aac',
+    m4a: 'audio/mp4',
+    // video
+    mp4: 'video/mp4',
+    webm: 'video/webm',
+    mov: 'video/quicktime',
+    avi: 'video/x-msvideo',
+    mkv: 'video/x-matroska',
+  }
+  return map[ext] || 'application/octet-stream'
+}