fix: redimensiona janela de chat ao minimizar/expandir

- Adiciona funcao set_chat_minimized que redimensiona a janela
- Modo minimizado: 200x56 (tamanho do chip)
- Modo expandido: 380x520 (tamanho completo)
- Janela reposiciona automaticamente no canto inferior direito
- Adiciona comando is_chat_using_sse para verificar modo de conexao

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/desktop/src-tauri/src/chat.rs

@@ -910,3 +910,37 @@ pub fn minimize_chat_window(app: &tauri::AppHandle, ticket_id: &str) -> Result<(
     }
     Ok(())
 }
+
+/// Redimensiona a janela de chat para modo minimizado (chip) ou expandido
+pub fn set_chat_minimized(app: &tauri::AppHandle, ticket_id: &str, minimized: bool) -> Result<(), String> {
+    let label = format!("chat-{}", ticket_id);
+    let window = app.get_webview_window(&label).ok_or("Janela nao encontrada")?;
+
+    // Tamanhos
+    let (width, height) = if minimized {
+        (200.0, 56.0) // Tamanho do chip
+    } else {
+        (380.0, 520.0) // Tamanho expandido
+    };
+
+    // Calcular posicao no canto inferior direito
+    let (x, y) = if let Some(monitor) = window.current_monitor().ok().flatten() {
+        let size = monitor.size();
+        let scale = monitor.scale_factor();
+        let margin = 20.0;
+        let taskbar_height = 50.0;
+        (
+            (size.width as f64 / scale) - width - margin,
+            (size.height as f64 / scale) - height - margin - taskbar_height,
+        )
+    } else {
+        (100.0, 100.0)
+    };
+
+    // Aplicar novo tamanho e posicao
+    window.set_size(tauri::LogicalSize::new(width, height)).map_err(|e| e.to_string())?;
+    window.set_position(tauri::LogicalPosition::new(x, y)).map_err(|e| e.to_string())?;
+
+    crate::log_info!("Chat {} -> minimized={}", ticket_id, minimized);
+    Ok(())
+}