feat: configurable shell selection + desktop settings UI (#20602)

packages/opencode/test/pty/pty-shell.test.ts

@@ -67,3 +67,38 @@ describe("pty shell args", () => {
     )
   }
 })
+
+describe("pty configured shell", () => {
+  test(
+    "uses configured shell for default PTY command",
+    async () => {
+      const configured = process.platform === "win32" ? Bun.which("pwsh") || Bun.which("powershell") : Bun.which("bash")
+      if (!configured) return
+
+      await using dir = await tmpdir({
+        config: { shell: Shell.name(configured) },
+      })
+      await Instance.provide({
+        directory: dir.path,
+        fn: () =>
+          AppRuntime.runPromise(
+            Effect.gen(function* () {
+              const pty = yield* Pty.Service
+              const info = yield* pty.create({ title: "configured" })
+              try {
+                if (process.platform === "win32") {
+                  expect(info.command.toLowerCase()).toBe(configured.toLowerCase())
+                } else {
+                  expect(info.command).toBe(configured)
+                }
+                expect(info.args).toEqual(process.platform === "win32" ? [] : ["-l"])
+              } finally {
+                yield* pty.remove(info.id)
+              }
+            }),
+          ),
+      })
+    },
+    { timeout: 30000 },
+  )
+})