Allow UI font weight to be assigned in settings (#12333)

Release Notes:

- Added the ability to configure the weight of your UI font in standard
CSS weight units from 0 to 900.

crates/ui/src/components/tooltip.rs

@@ -89,13 +89,13 @@ pub fn tooltip_container<V>(
     cx: &mut ViewContext<V>,
     f: impl FnOnce(Div, &mut ViewContext<V>) -> Div,
 ) -> impl IntoElement {
-    let ui_font = ThemeSettings::get_global(cx).ui_font.family.clone();
+    let ui_font = ThemeSettings::get_global(cx).ui_font.clone();
 
     // padding to avoid tooltip appearing right below the mouse cursor
     div().pl_2().pt_2p5().child(
         v_flex()
             .elevation_2(cx)
-            .font_family(ui_font)
+            .font(ui_font)
             .text_ui(cx)
             .text_color(cx.theme().colors().text)
             .py_1()

crates/ui/src/styles/typography.rs

@@ -169,10 +169,10 @@ pub struct Headline {
 
 impl RenderOnce for Headline {
     fn render(self, cx: &mut WindowContext) -> impl IntoElement {
-        let ui_font = ThemeSettings::get_global(cx).ui_font.family.clone();
+        let ui_font = ThemeSettings::get_global(cx).ui_font.clone();
 
         div()
-            .font_family(ui_font)
+            .font(ui_font)
             .line_height(self.size.line_height())
             .text_size(self.size.size())
             .text_color(cx.theme().colors().text)