Improve the bookmark map creation function

https://discord.com/channels/612683871112396800/692883287336681592/1482840714533667047

Currently some characters in China might end up partially beyond the right corner of the screen. 👀
Also, they shouldn't be so clumped together. 
<img width="628" height="542" alt="Image" src="https://github.com/user-attachments/assets/e14dbdd4-af73-40bf-8e4a-44a5a2a015d8" />