desktop/devtools: habilitar F12/Ctrl+Shift+I e menu de contexto para abrir DevTools

- src-tauri: adiciona comando open_devtools que chama window.open_devtools()
- frontend: listeners para F12/Ctrl+Shift+I e botão direito com Ctrl/Shift

Facilita depuração de UI no executável Tauri.

apps/desktop/src/main.tsx

@@ -769,3 +769,26 @@ function StatusBadge({ status }: { status: string | null }) {
 
 const root = document.getElementById("root") || (() => { const el = document.createElement("div"); el.id = "root"; document.body.appendChild(el); return el })()
 createRoot(root).render(<App />)
+  // DevTools shortcut (F12 / Ctrl+Shift+I) and context menu with modifier
+  useEffect(() => {
+    function onKeyDown(e: KeyboardEvent) {
+      const key = (e.key || '').toLowerCase()
+      if (key === 'f12' || (e.ctrlKey && e.shiftKey && key === 'i')) {
+        invoke('open_devtools').catch(() => {})
+        e.preventDefault()
+      }
+    }
+    function onContextMenu(e: MouseEvent) {
+      // Evita abrir sempre: use Ctrl ou Shift + botão direito para abrir DevTools
+      if (e.ctrlKey || e.shiftKey) {
+        invoke('open_devtools').catch(() => {})
+        e.preventDefault()
+      }
+    }
+    window.addEventListener('keydown', onKeyDown)
+    window.addEventListener('contextmenu', onContextMenu)
+    return () => {
+      window.removeEventListener('keydown', onKeyDown)
+      window.removeEventListener('contextmenu', onContextMenu)
+    }
+  }, [])