fix(tui): order messages by creation time (#40994)

Co-authored-by: Dax <mail@thdxr.com>

packages/tui/test/util/transcript.test.ts

@@ -349,6 +349,34 @@ describe("transcript", () => {
       expect(result).toContain("---")
     })
 
+    test("orders messages by creation time and preserves part order", () => {
+      const message = (id: string, created: number, parts: string[]) => ({
+        info: {
+          id,
+          sessionID: "ses_abc123",
+          role: "user" as const,
+          agent: "build",
+          model: { providerID: "anthropic", modelID: "claude" },
+          time: { created },
+        },
+        parts: parts.map((text, index) => ({
+          id: `part_${parts.length - index}`,
+          sessionID: "ses_abc123",
+          messageID: id,
+          type: "text" as const,
+          text,
+        })),
+      })
+      const result = formatTranscript(
+        { id: "ses_abc123", title: "Order", time: { created: 1, updated: 2 } },
+        [message("msg_a", 30, ["third"]), message("msg_z", 10, ["first", "second"])],
+        { thinking: false, toolDetails: false, assistantMetadata: false },
+      )
+
+      expect(result.indexOf("first")).toBeLessThan(result.indexOf("second"))
+      expect(result.indexOf("second")).toBeLessThan(result.indexOf("third"))
+    })
+
     test("falls back to raw model id when provider data is missing", () => {
       const session = {
         id: "ses_abc123",