fix: tag coloring code duplications cleand up

src/renderer/utils/color.ts

@@ -0,0 +1,20 @@
+export const getContrastColor = (hex: string): string => {
+  const color = hex.replace('#', '');
+
+  let r: number;
+  let g: number;
+  let b: number;
+
+  if (color.length === 3) {
+    r = parseInt(color[0] + color[0], 16);
+    g = parseInt(color[1] + color[1], 16);
+    b = parseInt(color[2] + color[2], 16);
+  } else {
+    r = parseInt(color.substring(0, 2), 16);
+    g = parseInt(color.substring(2, 4), 16);
+    b = parseInt(color.substring(4, 6), 16);
+  }
+
+  const luminance = (0.299 * r + 0.587 * g + 0.114 * b) / 255;
+  return luminance > 0.5 ? '#000000' : '#ffffff';
+};

src/renderer/utils/index.ts

@@ -1,3 +1,4 @@
 export { AutoSaveManager, type AutoSaveConfig } from './autoSave';
+export { getContrastColor } from './color';
 export { unescapeMacroSyntax } from './markdownEscape';
 export { groupPostsByStatus, type GroupedPosts, type PostStatus } from './postGrouping';