release: v1.2.5 — 图库页、图片详情弹层与列表体验优化

app/utils/image-display.ts

@@ -0,0 +1,24 @@
+export function getFileExtension(filename: string): string {
+  const base = filename.split(/[/\\]/).pop() ?? filename
+  const dot = base.lastIndexOf('.')
+  if (dot <= 0 || dot === base.length - 1) return '—'
+  return base.slice(dot + 1).toLowerCase()
+}
+
+export function getUrlPathname(url: string): string {
+  try {
+    return decodeURIComponent(new URL(url).pathname.replace(/^\/+/, ''))
+  } catch {
+    return url
+  }
+}
+
+export function getStorageKeyTail(key: string): string {
+  const prefix = 'images/'
+  return key.startsWith(prefix) ? key.slice(prefix.length) : key
+}
+
+export function formatImageDimensions(width: number | null, height: number | null): string | null {
+  if (!width || !height) return null
+  return `${width} × ${height} px`
+}