fix(bar): the macOS bar module's leftovers from the old layout (unused imports, f32 literal)

On the Mac Mini native clippy -D warnings failed in the macOS bar module with three findings that the fake-CC
check only printed as warnings: the re-exports of ICONS_CACHE and ImageIconId in macos/widgets/mod.rs are
unused (they were pub items of the crate root before the module move, which the lint does not flag),
and Stroke::new(1.0, ...) in macos/widgets/komorebi.rs:393 falls back to f32. The two re-exports are removed
(grep: nothing in the macOS module uses them; the Windows module does and keeps them), the literal is
1.0_f32 (the type it already had). The same sweep removed the #[allow(unused_imports)] re-export of
rgba_to_color_image, also unused on macOS. Remaining pub use lines (render, selected_frame, ui, statics,
Alignment) are used. Behaviour identical.
Gates run: macOS fake-CC check of komorebi-bar and komorebi-bar-macos --all-targets: no warning left in the
bar; Windows clippy -D warnings PASS; S/bar2 schemas byte-identical. Not run: native macOS clippy (the Mini).

komorebi-bar/src/macos/widgets/komorebi.rs

@@ -390,7 +390,7 @@ impl WorkspacesBar {
             .show(ui, |ui| {
                 let (response, painter) = ui.allocate_painter(self.icon_size, Sense::hover());
                 let stroke: Stroke = Stroke::new(
-                    1.0,
+                    1.0_f32,
                     if ws.is_selected {
                         ctx.style().visuals.selection.stroke.color
                     } else {

komorebi-bar/src/macos/widgets/mod.rs

@@ -12,8 +12,4 @@ pub use komorebi_bar_core::widgets::time;
 pub use komorebi_bar_core::widgets::update;
 pub mod widget;
 
-pub use komorebi_bar_core::widgets::icons::ICONS_CACHE;
 pub use komorebi_bar_core::widgets::icons::ImageIcon;
-pub use komorebi_bar_core::widgets::icons::ImageIconId;
-#[allow(unused_imports)]
-pub use komorebi_bar_core::widgets::icons::rgba_to_color_image;