Unified primary button colors

[silverwind]

Currently we are inconsistent with primary buttons. Code button is green, merge button and new issue button are primary.

I feel like all primary buttons should be the same color. The easiest way would be to make the code button primary as well. Or we do it like GitHub and make primary buttons green (diverging from primary links which are blue). I'm undecided whether green or primary (default blue) would be better.

[hiifong]

To be honest, I prefer green

[wxiaoguang]

To be honest, I prefer green

GitHub uses green because its primary color is green.

Gitea's primary color is blue.

[lunny]

So maybe change it to blue?

Using green as the primary button color for Gitea could clash with its green logo, making the interface feel monotonous. Blue provides a complementary contrast, helping buttons stand out clearly while maintaining a balanced design. GitHub uses green buttons because its black logo allows for contrast; for Gitea, blue achieves a similar effect.

[xxfogs]

"Sync fork" too should use primary

If primary is in use for buttons, the theme can be adjusted to anyone's preferences

[wxiaoguang]

-> Use primary as button color #32949