Revert "Revert recent anti-aliasing improvements (#24289)" and fix selection top right corner radius issue (#24342)

Release Notes:

- N/A

----

To fix #24289 mention issue and revert PathBuilder and MSAA.

I'm sorry about of this, in #22808 I was forgotten this bit of detail.


![image](https://github.com/user-attachments/assets/112afda2-088c-41d0-83bd-808f6cd2f9d5)

So, add `move_to` here, we can fix the selection top right corner radius
issue.

## After change

<img width="1383" alt="image"
src="https://github.com/user-attachments/assets/28ea103c-d652-41d6-bbe0-7fd042d81e77"
/>

crates/gpui/Cargo.toml

@@ -108,6 +108,7 @@ thiserror.workspace = true
 util.workspace = true
 uuid.workspace = true
 waker-fn = "1.2.0"
+lyon = "1.0"
 
 [target.'cfg(target_os = "macos")'.dependencies]
 block = "0.1"
@@ -205,6 +206,7 @@ rand.workspace = true
 util = { workspace = true, features = ["test-support"] }
 http_client = { workspace = true, features = ["test-support"] }
 unicode-segmentation.workspace = true
+lyon = { version = "1.0", features = ["extra"] }
 
 [target.'cfg(target_os = "windows")'.build-dependencies]
 embed-resource = "3.0"