fix(opencode): improve console login transport errors (#21350)

packages/opencode/test/cli/error.test.ts

@@ -0,0 +1,18 @@
+import { describe, expect, test } from "bun:test"
+import { AccountTransportError } from "../../src/account/schema"
+import { FormatError } from "../../src/cli/error"
+
+describe("cli.error", () => {
+  test("formats account transport errors clearly", () => {
+    const error = new AccountTransportError({
+      method: "POST",
+      url: "https://console.opencode.ai/auth/device/code",
+    })
+
+    const formatted = FormatError(error)
+
+    expect(formatted).toContain("Could not reach POST https://console.opencode.ai/auth/device/code.")
+    expect(formatted).toContain("This failed before the server returned an HTTP response.")
+    expect(formatted).toContain("Check your network, proxy, or VPN configuration and try again.")
+  })
+})