Match bonsplit chrome to Ghostty theme

Sources/Workspace.swift

@@ -332,28 +332,10 @@ final class Workspace: Identifiable, ObservableObject {
         bonsplitAppearance(from: config.backgroundColor)
     }
 
-    private static func usesDarkChrome(
-        appAppearance: NSAppearance? = NSApp?.effectiveAppearance
-    ) -> Bool {
-        guard let appAppearance else { return false }
-        return appAppearance.bestMatch(from: [.darkAqua, .aqua]) == .darkAqua
-    }
-
-    private static func resolvedChromeBackgroundHex(
-        from backgroundColor: NSColor,
-        appAppearance: NSAppearance? = NSApp?.effectiveAppearance
-    ) -> String? {
-        guard usesDarkChrome(appAppearance: appAppearance) else { return nil }
-        return backgroundColor.hexString()
-    }
-
-    private static func resolvedChromeColors(
+    nonisolated static func resolvedChromeColors(
         from backgroundColor: NSColor
     ) -> BonsplitConfiguration.Appearance.ChromeColors {
-        guard let backgroundHex = resolvedChromeBackgroundHex(from: backgroundColor) else {
-            return .init()
-        }
-        return .init(backgroundHex: backgroundHex)
+        .init(backgroundHex: backgroundColor.hexString())
     }
 
     private static func bonsplitAppearance(from backgroundColor: NSColor) -> BonsplitConfiguration.Appearance {

cmuxTests/GhosttyConfigTests.swift

@@ -208,6 +208,30 @@ final class GhosttyConfigTests: XCTestCase {
     }
 }
 
+final class WorkspaceChromeThemeTests: XCTestCase {
+    func testResolvedChromeColorsUsesLightGhosttyBackground() {
+        guard let backgroundColor = NSColor(hex: "#FDF6E3") else {
+            XCTFail("Expected valid test color")
+            return
+        }
+
+        let colors = Workspace.resolvedChromeColors(from: backgroundColor)
+        XCTAssertEqual(colors.backgroundHex, "#FDF6E3")
+        XCTAssertNil(colors.borderHex)
+    }
+
+    func testResolvedChromeColorsUsesDarkGhosttyBackground() {
+        guard let backgroundColor = NSColor(hex: "#272822") else {
+            XCTFail("Expected valid test color")
+            return
+        }
+
+        let colors = Workspace.resolvedChromeColors(from: backgroundColor)
+        XCTAssertEqual(colors.backgroundHex, "#272822")
+        XCTAssertNil(colors.borderHex)
+    }
+}
+
 final class NotificationBurstCoalescerTests: XCTestCase {
     func testSignalsInSameBurstFlushOnce() {
         let coalescer = NotificationBurstCoalescer(delay: 0.01)