This PR introduces Tinted button styles and the `selected_style` field
on buttons to allow replicating the previous design of titlebar call
controls. It also updates the styles of the titlebar controls.
### Creating a tinted button:
```
Button::new("accept-cta", "Accept")
.style(ButtonStyle::Tinted(TintColor::Accent))
.on_click(...)
```
Ths button will always be tinted blue.
### Creating a button that becomes tinted when selected::
```rust
IconButton::new("screen-share", Icon::Screen)
.style(ButtonStyle::Subtle)
.selected(is_screen_sharing)
.selected_style(ButtonStyle::Tinted(TintColor::Accent))
.on_click(...),
```
This button will be flat/subtle by default, but be tinted blue when it
is `selected`.
Note: There appears to be some issue where `is_deafened` isn't
activating correctly, making the speaker icon not toggle when selected.
Release Notes:
- Restore call control styles to a similar look to Zed 1.
Nate Butler
a205b2dbf3