BRUSSELS—The EU aims to have a common charging port for mobile phones, tablets, and headphones under a European Commission proposal presented on Thursday in a world first, with the move impacting iPhone maker Apple more than its rivals. The move has been more than 10 years in the making, with the European Union executive touting environmental benefits and 250 million euros ($293 million) in annual savings for users. Under the Commission’s proposal, a USB-C connector will become the standard port for all smartphones, tablets, cameras, headphones, portable speakers, and handheld videogame consoles. Chargers will also be sold separately from electronic devices. The EU executive will revise its eco-design regulation in the near future so that the external power supply is interoperable, which is the last step for a common charge. The Commission said it was not targeting Apple and only acted because companies were not able to agree on a …