feat: configure launcher color scheme

Tests/ConjureKitTests/TranslationExecutionTests.swift

@@ -269,7 +269,7 @@ func translationExecutionRecoversFromCredentialAndRequestFailures() async throws
     tool.translate() // No stored key.
     #expect(requests.inputs.isEmpty)
     #expect(button.isEnabled)
-    #expect(status.textColor == .systemRed)
+    #expect(status.textColor == ThemePalette.error)
     #expect(!openSettings.isHidden)
     field.stringValue = "typed-key"
     tool.translate() // Typing in Settings must not implicitly save on Translate.
@@ -296,7 +296,7 @@ func translationExecutionRecoversFromCredentialAndRequestFailures() async throws
     #expect(requests.inputs[0].key == "typed-key")
     requests.pending[0].resume(throwing: CredentialFailure())
     try await waitForTranslation { button.isEnabled }
-    #expect(status.textColor == .systemRed)
+    #expect(status.textColor == ThemePalette.error)
     keys.denied = true
     forget.performClick(nil)
     #expect(keys.value == "typed-key")
@@ -315,7 +315,7 @@ func translationExecutionRecoversFromCredentialAndRequestFailures() async throws
     try await waitForTranslation { requests.pending.count == 3 }
     requests.pending[2].resume(returning: "成功")
     try await waitForTranslation { output.string == "成功" }
-    #expect(status.textColor != .systemRed)
+    #expect(status.textColor != ThemePalette.error)
 }
 
 @Test @MainActor