fix(ui): prevent content click from toggling accordion and improve UX with cursor-text in Codeblock (#930)

Hovering over the code block previously showed a pointer cursor, and
clicking inside would collapse/expand the accordion. This PR updates the
DyadWrite component to use `cursor-text` and adds `e.stopPropagation()`
so clicks inside the code block no longer toggle the accordion, making
it behave like other AI tools and improving user friendliness.


Before


https://github.com/user-attachments/assets/7b6983fd-91a0-4f30-9337-d444cbfcc110

After


https://github.com/user-attachments/assets/07d0d765-7206-4552-b0b4-2665d87df4a1