refactor(shared): dedupe chat content text extraction

src/shared/chat-content.test.ts

@@ -0,0 +1,26 @@
+import { describe, expect, it } from "vitest";
+import { extractTextFromChatContent } from "./chat-content.js";
+
+describe("extractTextFromChatContent", () => {
+  it("normalizes string content", () => {
+    expect(extractTextFromChatContent("  hello\nworld  ")).toBe("hello world");
+  });
+
+  it("extracts text blocks from array content", () => {
+    expect(
+      extractTextFromChatContent([
+        { type: "text", text: " hello " },
+        { type: "image_url", image_url: "https://example.com" },
+        { type: "text", text: "world" },
+      ]),
+    ).toBe("hello world");
+  });
+
+  it("applies sanitizer when provided", () => {
+    expect(
+      extractTextFromChatContent("Here [Tool Call: foo (ID: 1)] ok", {
+        sanitizeText: (text) => text.replace(/\[Tool Call:[^\]]+\]\s*/g, ""),
+      }),
+    ).toBe("Here ok");
+  });
+});