feat(desktop): remember the selected encode/decode type

[XL-YiBai]

PR Checklist

If you have any questions, you can refer to the Contributing Guide

What is the current behavior?

Restarting \ switching tools will change the default value of plaintext, resulting in other encoded messages will be garbled.

Issue Number

#903

What is the new behavior?

Remember the encoding/decoding type selected by the user.

Does this PR introduce a breaking change?

• Yes
• No

Specific Instructions

Are there any specific instructions or things that should be known prior to review?

Other information

[ysfscream]

Thanks to @XL-YiBai for the contribution. However, I reviewed your code, which currently only works for the receiving side. Consider setting it up for the publishing side. Thanks.

[XL-YiBai]

Thanks to @XL-YiBai for the contribution. However, I reviewed your code, which currently only works for the receiving side. Consider setting it up for the publishing side. Thanks.

Hi, @ysfscream, I have reviewed the code for MsgPublish.vue and noticed that the ten recently sent messages will be stored, including their payloadType. After testing, the publishing side has already supported this feature.

[ysfscream]

Oh, indeed. I now see that it's already included in the historical messages. That slipped my mind, appreciate your reminder. Let's move this PR forward for review. We'll conduct local testing, thank you.