Adds a way to toggle font size without settings adjustments (#24857)

Closes https://github.com/zed-industries/zed/issues/23505

Now `zed::IncreaseBufferFontSize` (and all the same UI- and
Buffer-related settings) action is parameterized with `{ "persist": true
}` (default).
Using `"persist": false` brings back resizing behavior prior to
https://github.com/zed-industries/zed/pull/23265


Release Notes:

- Added a way to toggle font size without settings adjustments

crates/ui/src/styles/typography.rs

@@ -83,7 +83,7 @@ pub trait StyledTypography: Styled + Sized {
     /// or other places that text needs to match the user's buffer font size.
     fn text_buffer(self, cx: &App) -> Self {
         let settings = ThemeSettings::get_global(cx);
-        self.text_size(settings.buffer_font_size())
+        self.text_size(settings.buffer_font_size(cx))
     }
 }