Simplify optional chaining logic in color getter functions

Co-authored-by: alexr00 <38270282+alexr00@users.noreply.github.com>

Author: Copilot

src/view/theme.ts

@@ -74,17 +74,17 @@ function getCurrentThemePaths(themeName: string): vscode.Uri | undefined {
 }
 
 export function getIconForeground(themeData: ThemeData | undefined, kind: 'light' | 'dark'): string {
-	return (themeData?.colors ? themeData.colors['icon.foreground'] : undefined) ?? (kind === 'dark' ? '#C5C5C5' : '#424242');
+	return themeData?.colors?.['icon.foreground'] ?? (kind === 'dark' ? '#C5C5C5' : '#424242');
 }
 
 export function getListWarningForeground(themeData: ThemeData | undefined, kind: 'light' | 'dark'): string {
-	return (themeData?.colors ? themeData.colors['list.warningForeground'] : undefined) ?? (kind === 'dark' ? '#CCA700' : '#855F00');
+	return themeData?.colors?.['list.warningForeground'] ?? (kind === 'dark' ? '#CCA700' : '#855F00');
 }
 
 export function getListErrorForeground(themeData: ThemeData | undefined, kind: 'light' | 'dark'): string {
-	return (themeData?.colors ? themeData.colors['list.errorForeground'] : undefined) ?? (kind === 'dark' ? '#F88070' : '#B01011');
+	return themeData?.colors?.['list.errorForeground'] ?? (kind === 'dark' ? '#F88070' : '#B01011');
 }
 
 export function getNotebookStatusSuccessIconForeground(themeData: ThemeData | undefined, kind: 'light' | 'dark'): string {
-	return (themeData?.colors ? themeData.colors['notebookStatusSuccessIcon.foreground'] : undefined) ?? (kind === 'dark' ? '#89D185' : '#388A34');
+	return themeData?.colors?.['notebookStatusSuccessIcon.foreground'] ?? (kind === 'dark' ? '#89D185' : '#388A34');
 }