refine thinking part filtering

src/types/message.ts

@@ -31,3 +31,44 @@ export interface TextPart {
   synthetic?: boolean
   renderCache?: RenderCache
 }
+
+function hasTextSegment(segment: unknown): boolean {
+  if (typeof segment === "string") {
+    return segment.trim().length > 0
+  }
+
+  if (segment && typeof segment === "object") {
+    const maybeText = (segment as { text?: unknown }).text
+    if (typeof maybeText === "string") {
+      return maybeText.trim().length > 0
+    }
+  }
+
+  return false
+}
+
+export function partHasRenderableText(part: any): boolean {
+  if (!part || typeof part !== "object") {
+    return false
+  }
+
+  if (hasTextSegment(part.text)) {
+    return true
+  }
+
+  const contentArray = Array.isArray(part?.content) ? part.content : []
+  for (const item of contentArray) {
+    if (hasTextSegment(item)) {
+      return true
+    }
+  }
+
+  const thinkingContent = Array.isArray(part?.thinking?.content) ? part.thinking.content : []
+  for (const chunk of thinkingContent) {
+    if (hasTextSegment(chunk)) {
+      return true
+    }
+  }
+
+  return false
+}