fix(canvas): 生成结果命名 - 保留复制与参数变体标识避免下载重名

web/src/lib/canvas/canvas-generation-title.ts

@@ -0,0 +1,23 @@
+import type { CanvasNodeData } from "@/types/canvas";
+
+const COPY_SUFFIX = /(_copy\d+|\s+Copy)$/i;
+const VERSION_SUFFIX = /\s*·\s*([A-Z])\s*$/;
+
+export function buildImageGenerationNodeTitle(prompt: string, sourceNode?: CanvasNodeData, outputIndex?: number, outputCount = 1) {
+    let title = prompt.trim().slice(0, 32) || "Generated Image";
+    if (sourceNode) {
+        const sourceTitleWithoutVersion = sourceNode.title.replace(VERSION_SUFFIX, "");
+        const copySuffix = sourceTitleWithoutVersion.match(COPY_SUFFIX)?.[1] || "";
+        const versionLabel = validVersionLabel(sourceNode.metadata?.versionLabel) || sourceNode.title.match(VERSION_SUFFIX)?.[1] || "";
+        const titleWithoutVersion = title.replace(VERSION_SUFFIX, "");
+        if (copySuffix && !titleWithoutVersion.toLowerCase().endsWith(copySuffix.toLowerCase())) title += copySuffix;
+        if (versionLabel && !title.endsWith(` · ${versionLabel}`)) title += ` · ${versionLabel}`;
+    }
+    if (outputCount > 1 && outputIndex !== undefined) title += ` · ${outputIndex + 1}`;
+    return title;
+}
+
+function validVersionLabel(value?: string) {
+    const normalized = value?.trim().toUpperCase() || "";
+    return /^[A-Z]$/.test(normalized) ? normalized : "";
+}