feat: add selection toolbar window for mac (#980)

* feat: add selection window page

* fix: chat input

* feat: add selection page

* chore: add

* chore: test

* feat: add

* feat: add store

* feat: add selection settings

* chore: remove unused code

* docs: add release note

* docs: add release note

* chore: format code

* chore: format code

* fix: copy error

* disable hashbrown default feature

* Enable unstable feature allocator_api

To make coco-app compile in CI:

```
--> /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/hashbrown-0.15.5/src/raw/mod.rs:3856:12
     |
3856 | impl<T, A: Allocator> RawIntoIter<T, A> {
     |            ^^^^^^^^^
     |
     = note: see issue #32838 <https://github.com/rust-lang/rust/issues/32838> for more information
     = help: add `#![feature(allocator_api)]` to the crate attributes to enable
     = note: this compiler was built on 2025-06-25; consider upgrading it if it is out of date
```

I don't know why it does not compile, feature `allocator-api2` is
enabled for `hashbrown 0.15.5`, so technically [1] it should not use the
allocator APIs from the std. According to [2], enabling the `nightly`
feature of `allocator-api2` may cause this issue as well, but it is not
enabled in our case either.

Anyway, enabling `#![feature(allocator_api)]` should make it work.

[1]: b751eef8e9/src/raw/alloc.rs (L26-L47)
[2]: https://github.com/rust-lang/hashbrown/issues/564

* put it in main.rs

* format main.rs

* Enable default-features for hashbrown 0.15.5

* format main.rs

* enable feature allocator-api2

* feat: add selection set config

* fix: selection setting

* fix: ci error

* fix: ci error

* fix: ci error

* fix: ci error

* merge: merge main

* fix: rust code warn

* fix: rust code error

* fix: rust code error

* fix: selection settings

* style: selection styles

* style: selection styles

---------

Co-authored-by: Steve Lau <stevelauc@outlook.com>

.vscode/settings.json

@@ -14,6 +14,7 @@
     "dyld",
     "elif",
     "errmsg",
+    "frontmost",
     "fullscreen",
     "fulltext",
     "headlessui",
@@ -40,6 +41,7 @@
     "nowrap",
     "nspanel",
     "nsstring",
+    "objc",
     "overscan",
     "partialize",
     "patchelf",