• Added a port-busy warning dialog when the serial device is in use, instead of showing bootloader tips.
• Skipping partition table read for ESP8266 (not supported).
• Improved flash size detection and messaging: when detection fails, the UI now shows "Flash size not detected" instead of "Unknown".
• esptool-js is now embedded directly in the ESPConnect codebase, providing tighter integration, better control over the bootloader workflow, and easier maintenance.