This PR adjusts the server action transforms to assign proper function names for the generated server reference proxies.
- If the original function has a name, this name is used.
- If a function expression is assigned to a variable, the variable's name is used.
- If an anonymous function expression is assigned to a prop, the prop's name is used.
In addition, this PR simplifies the output for exported functions, avoiding unnecessary `registerServerReference` calls.
It also fixes the source mapping of default exported server actions.
**Before:**
<img width="890" alt="before" src="https://github.com/user-attachments/assets/a3d6a5f8-d48e-474d-8f03-b49306fb704f">
**After:**
<img width="890" alt="after" src="https://github.com/user-attachments/assets/8f332690-6c26-46f1-9eef-7680f47ea578">
Next up, we will do the same for `'use cache'` functions.
Hendrik Liebau