feat: add spinner component

crates/icons/src/segoe.rs

@@ -6,6 +6,9 @@ use crate::IconRole;
 /// The Segoe Fluent Icons codepoint for the role.
 pub(crate) fn glyph(role: IconRole) -> Option<char> {
     let codepoint = match role {
+        // No Segoe spinner glyph; the icon falls back to the bundled SVG,
+        // which the spinner rotates.
+        IconRole::Loader => return None,
         IconRole::Check => 0xE73E,          // CheckMark
         IconRole::Close => 0xE8BB,          // ChromeClose
         IconRole::ChevronDown => 0xE70D,    // ChevronDown
@@ -37,9 +40,12 @@ mod tests {
     use super::*;
 
     #[test]
-    fn every_role_maps_to_a_codepoint() {
+    fn every_role_maps_a_codepoint_or_falls_back_to_the_bundled_svg() {
         for role in crate::IconRole::all() {
-            assert!(glyph(*role).is_some(), "missing codepoint for {role:?}");
+            assert!(
+                glyph(*role).is_some() || crate::asset_bytes(role.asset_path()).is_some(),
+                "no Segoe codepoint or bundled asset for {role:?}"
+            );
         }
     }