Theme · Platform: one platform for buttons and caps, icon themes, frosted panes

theme::Platform moves out of typography and shell's ControlsStyle folds
into it; the theme's platform starts as the system's. Window buttons Ely
draws, the title bar's layout and every key cap follow it, secondary
included, through typography::keys::keystroke; a title bar whose buttons
the OS draws follows the OS. primitives::IconTheme lays an owner's rules
by file name and extension over Ely's map, for every file icon.
shell::Vibrancy fills a pane with the palette's new glass, translucent
so a window opened Blurred shows its backdrop, solid under high contrast.
gpui 0.2.2 has no Mica; that line stays blocked.

src/buttons/quick.rs

@@ -1,11 +1,11 @@
 use std::rc::Rc;
 
 use gpui::{
-    App, ElementId, Entity, FontWeight, InteractiveElement, IntoElement, Keystroke, ParentElement,
-    RenderOnce, SharedString, StatefulInteractiveElement, Styled, Window, div, prelude::*,
+    App, ElementId, Entity, FontWeight, InteractiveElement, IntoElement, ParentElement, RenderOnce,
+    SharedString, StatefulInteractiveElement, Styled, Window, div, prelude::*,
 };
 
-use super::button::shortcut_text;
+use super::button::{keystroke_of, shortcut_text};
 use crate::{
     primitives::{FocusRing, Icon, IconName},
     theme::{ActiveTheme, ControlSize, IconSize, Radius, TextSize},
@@ -19,7 +19,7 @@ pub struct QuickAction {
     icon: IconName,
     label: SharedString,
     note: Option<SharedString>,
-    shortcut: Option<Keystroke>,
+    shortcut: Option<SharedString>,
     run: Run,
 }
 
@@ -45,9 +45,8 @@ impl QuickAction {
 
     /// Panics on a bad keystroke.
     pub fn shortcut(mut self, keystroke: &str) -> Self {
-        let parsed = Keystroke::parse(keystroke)
-            .unwrap_or_else(|error| panic!("quick action shortcut {keystroke:?}: {error}"));
-        self.shortcut = Some(parsed);
+        keystroke_of(keystroke);
+        self.shortcut = Some(SharedString::from(keystroke.to_string()));
         self
     }
 }
@@ -171,7 +170,7 @@ impl RenderOnce for QuickActions {
                             div()
                                 .text_size(theme.text_size(TextSize::Xs))
                                 .text_color(colors.fg_subtle)
-                                .child(shortcut_text(stroke)),
+                                .child(shortcut_text(stroke, theme.platform)),
                         )
                     })
             })