fix(viewcube): draw the WCS pill's arrow instead of a "⌄" glyph (fixes #1541) (#1558)

The pill under the ViewCube was the text "WCS ⌄". U+2304 is missing from some
UI fonts, so it showed as a box ("WCS □"). The pill now paints the translated
label and a down chevron drawn as lines, in the pill's ink, so it no longer
depends on the font. The catalog key becomes "WCS" in every language; Korean,
which spelled the arrow out as "WCS 선택", is now "WCS" next to the chevron.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

crates/ui-egui/src/canvas.rs

@@ -2281,10 +2281,18 @@ fn draw_viewcube(app: &mut CadApp, ui: &mut egui::Ui, rect: Rect) {
     let (c, ring) = (l.center, l.ring);
     let p = ui.painter_at(rect);
     crate::viewcube::show(app, ui, &l);
-    // WCS pill.
+    // WCS pill: the label and a down chevron, drawn as lines rather than a "⌄" glyph that a UI
+    // font may lack (it showed as a box, #1541).
     let pill = Rect::from_center_size(c + vec2(0.0, ring + 26.0), vec2(56.0, 16.0));
     p.rect_filled(pill, 8.0, Color32::from_rgb(0x48, 0x50, 0x5c));
-    p.text(pill.center(), egui::Align2::CENTER_CENTER, crate::tl!("WCS ⌄"), crate::theme::small(), Tokens::DARK.canvas_ink);
+    let ink = Tokens::DARK.canvas_ink;
+    let label = p.layout_no_wrap(crate::tl!("WCS").to_string(), crate::theme::small(), ink);
+    let (gap, chevron) = (4.0, 6.0);
+    let left = pill.center().x - (label.size().x + gap + chevron) / 2.0;
+    let mid = pill.center().y;
+    p.galley(pos2(left, mid - label.size().y / 2.0), label.clone(), ink);
+    let x = left + label.size().x + gap;
+    p.line(vec![pos2(x, mid - 1.5), pos2(x + chevron / 2.0, mid + 1.5), pos2(x + chevron, mid - 1.5)], Stroke::new(1.2, ink));
 }
 
 /// A click on grip `g` (idle): Shift+click makes it hot or cold again; a plain click starts

crates/ui-egui/src/i18n/ar.tsv

@@ -1192,7 +1192,7 @@
 	Viewport {id}	إطار العرض {id}
 	Viewports	منافذ عرض
 	Volume	مستوى الصوت
-	WCS ⌄	WCS ⌄
+	WCS	WCS
 	White	أبيض
 	Width factor	معامل العرض
 	Window	نافذة

crates/ui-egui/src/i18n/cs.tsv

@@ -1139,7 +1139,7 @@
 	Viewport {id}	Výřez {id}
 	Viewports	Výřezy
 	W	Z
-	WCS ⌄	GSS ⌄
+	WCS	GSS
 	White	Bílá
 	Width factor	Faktor šířky
 	Window	Okno

crates/ui-egui/src/i18n/de.tsv

@@ -968,7 +968,7 @@
 	Viewport {id}	Ansichtsfenster {id}
 	Viewports	Ansichtsfenster
 	W	W
-	WCS ⌄	WKS ⌄
+	WCS	WKS
 	White	Weiß
 	Width factor	Breitenfaktor
 	Window	Fenster

crates/ui-egui/src/i18n/es.tsv

@@ -1177,7 +1177,7 @@
 	Viewports	Ventanas gráficas
 	Volume	Volumen
 	W	O
-	WCS ⌄	SCU ⌄
+	WCS	SCU
 	White	Blanco
 	Width factor	Factor de anchura
 	Window	Ventana

crates/ui-egui/src/i18n/fr.tsv

@@ -962,7 +962,7 @@
 	Viewport {id}	Fenêtre {id}
 	Viewports	Fenêtres
 	W	O
-	WCS ⌄	SCG ⌄
+	WCS	SCG
 	White	Blanc
 	Width factor	Facteur de largeur
 	Window	Fenêtre

crates/ui-egui/src/i18n/it.tsv

@@ -1142,7 +1142,7 @@ menu	Modify	Edita
 	Viewport {id}	Finestra {id}
 	Viewports	Finestre
 	W	O
-	WCS ⌄	WCS ⌄
+	WCS	WCS
 	White	Bianco
 	Width factor	Fattore di larghezza
 	Window	Finestra

crates/ui-egui/src/i18n/ko.tsv

@@ -1138,7 +1138,7 @@
 	Viewport {id}	뷰포트 {id}
 	Viewports	뷰포트
 	W	서
-	WCS ⌄	WCS 선택
+	WCS	WCS
 	White	흰색
 	Width factor	폭 비율
 	Window	창

crates/ui-egui/src/i18n/pt_br.tsv

@@ -1177,7 +1177,7 @@
 	Viewports	Viewports
 	Volume	Volume
 	W	O
-	WCS ⌄	SCM ⌄
+	WCS	SCM
 	White	Branco
 	Width factor	Fator de largura
 	Window	Janela

crates/ui-egui/src/i18n/ru.tsv

@@ -962,7 +962,7 @@
 	Viewport {id}	Видовой экран {id}
 	Viewports	Видовые экраны
 	W	З
-	WCS ⌄	МСК ⌄
+	WCS	МСК
 	White	Белый
 	Width factor	Коэффициент ширины
 	Window	Окно

crates/ui-egui/src/i18n/sv.tsv

@@ -1176,7 +1176,7 @@
 	Viewports	Vyfönster
 	Volume	Volym
 	W	V
-	WCS ⌄	WCS ⌄
+	WCS	WCS
 	White	Vit
 	Width factor	Breddfaktor
 	Window	Fönster

crates/ui-egui/src/i18n/tests.rs

@@ -271,6 +271,36 @@ fn live_switch_to_brazilian_portuguese_translates_the_shell() {
     assert!(render(&mut app, &ctx).contains("Properties"));
 }
 
+#[test]
+fn the_wcs_pill_draws_its_arrow_instead_of_a_glyph_a_font_may_lack() {
+    // #1541: "WCS ⌄" showed a box where the UI font had no "⌄"; the chevron is now drawn as
+    // lines, so no catalog and no language paints the glyph.
+    for (name, catalog) in [
+        ("ar", include_str!("ar.tsv")),
+        ("cs", include_str!("cs.tsv")),
+        ("de", include_str!("de.tsv")),
+        ("es", include_str!("es.tsv")),
+        ("fr", include_str!("fr.tsv")),
+        ("it", include_str!("it.tsv")),
+        ("ko", include_str!("ko.tsv")),
+        ("pt_br", include_str!("pt_br.tsv")),
+        ("ru", include_str!("ru.tsv")),
+        ("sv", include_str!("sv.tsv")),
+        ("uk", include_str!("uk.tsv")),
+        ("zh", include_str!("zh.tsv")),
+    ] {
+        assert!(!catalog.contains('\u{2304}'), "{name}.tsv still has the \u{2304} glyph");
+    }
+    let ctx = egui::Context::default();
+    let mut app = CadApp::new(Session::new(), Services::default());
+    for (lang, label) in [("en", "WCS"), ("de", "WKS"), ("ru", "МСК")] {
+        app.run("ui.language", json!({ "lang": lang })).unwrap();
+        let text = render(&mut app, &ctx);
+        assert!(text.lines().any(|l| l == label), "{lang}: the pill reads {label}");
+        assert!(!text.contains('\u{2304}'), "{lang}: no \u{2304} glyph is painted");
+    }
+}
+
 fn painted_text(shapes: &[egui::epaint::ClippedShape]) -> String {
     fn collect(shape: &egui::Shape, text: &mut String) {
         match shape {
@@ -621,7 +651,7 @@ fn korean_representative_translations_remain_available() {
         ("", "Properties", "특성"),
         ("", "Degree", "도 기호"),
         ("", "Style: Standard", "스타일: Standard"),
-        ("", "WCS ⌄", "WCS 선택"),
+        ("", "WCS", "WCS"),
         ("@plural", "{n} contributor", "기여자 {n}명"),
         ("@plural", "{n} commit", "커밋 {n}개"),
     ] {

crates/ui-egui/src/i18n/uk.tsv

@@ -1179,7 +1179,7 @@
 	Viewport {id}	Видовий екран {id}
 	Viewports	Видові екрани
 	W	Зх
-	WCS ⌄	ССК ⌄
+	WCS	ССК
 	White	Білий
 	Width factor	Коефіцієнт ширини
 	Window	Вікно

crates/ui-egui/src/i18n/zh.tsv

@@ -963,7 +963,7 @@
 	Viewport {id}	视口 {id}
 	Viewports	视口
 	W	W
-	WCS ⌄	WCS ⌄
+	WCS	WCS
 	White	白色
 	Width factor	宽度因子
 	Window	窗口