fix(contracts): restore sidebar preview setting

Co-authored-by: codex <codex@users.noreply.github.com>

Author: juliusmarminge

packages/contracts/src/settings.test.ts

@@ -2,30 +2,10 @@ import { describe, expect, it } from "vitest";
 import { Schema } from "effect";
 
 import { ProviderInstanceId } from "./providerInstance.ts";
-import {
-  MAX_SIDEBAR_THREAD_PREVIEW_COUNT,
-  MIN_SIDEBAR_THREAD_PREVIEW_COUNT,
-  SidebarThreadPreviewCount,
-  DEFAULT_SERVER_SETTINGS,
-  ServerSettings,
-  ServerSettingsPatch,
-} from "./settings.ts";
+import { DEFAULT_SERVER_SETTINGS, ServerSettings, ServerSettingsPatch } from "./settings.ts";
 
 const decodeServerSettings = Schema.decodeUnknownSync(ServerSettings);
 const decodeServerSettingsPatch = Schema.decodeUnknownSync(ServerSettingsPatch);
-const decodeSidebarThreadPreviewCount = Schema.decodeUnknownSync(SidebarThreadPreviewCount);
-
-describe("SidebarThreadPreviewCount", () => {
-  it("accepts the configured 1-15 range", () => {
-    expect(decodeSidebarThreadPreviewCount(MIN_SIDEBAR_THREAD_PREVIEW_COUNT)).toBe(1);
-    expect(decodeSidebarThreadPreviewCount(MAX_SIDEBAR_THREAD_PREVIEW_COUNT)).toBe(15);
-  });
-
-  it("rejects values outside the configured range", () => {
-    expect(() => decodeSidebarThreadPreviewCount(MIN_SIDEBAR_THREAD_PREVIEW_COUNT - 1)).toThrow();
-    expect(() => decodeSidebarThreadPreviewCount(MAX_SIDEBAR_THREAD_PREVIEW_COUNT + 1)).toThrow();
-  });
-});
 
 describe("ServerSettings.providerInstances (slice-2 invariant)", () => {
   it("defaults to an empty record so legacy configs without the key still decode", () => {

packages/contracts/src/settings.ts

@@ -27,6 +27,16 @@ export const SidebarProjectGroupingMode = Schema.Literals([
 ]);
 export type SidebarProjectGroupingMode = typeof SidebarProjectGroupingMode.Type;
 export const DEFAULT_SIDEBAR_PROJECT_GROUPING_MODE: SidebarProjectGroupingMode = "repository";
+export const MIN_SIDEBAR_THREAD_PREVIEW_COUNT = 1;
+export const MAX_SIDEBAR_THREAD_PREVIEW_COUNT = 15;
+export const SidebarThreadPreviewCount = Schema.Int.check(
+  Schema.isBetween({
+    minimum: MIN_SIDEBAR_THREAD_PREVIEW_COUNT,
+    maximum: MAX_SIDEBAR_THREAD_PREVIEW_COUNT,
+  }),
+);
+export type SidebarThreadPreviewCount = typeof SidebarThreadPreviewCount.Type;
+export const DEFAULT_SIDEBAR_THREAD_PREVIEW_COUNT: SidebarThreadPreviewCount = 6;
 
 export const ClientSettingsSchema = Schema.Struct({
   autoOpenPlanSidebar: Schema.Boolean.pipe(Schema.withDecodingDefault(Effect.succeed(true))),
@@ -75,6 +85,9 @@ export const ClientSettingsSchema = Schema.Struct({
   sidebarThreadSortOrder: SidebarThreadSortOrder.pipe(
     Schema.withDecodingDefault(Effect.succeed(DEFAULT_SIDEBAR_THREAD_SORT_ORDER)),
   ),
+  sidebarThreadPreviewCount: SidebarThreadPreviewCount.pipe(
+    Schema.withDecodingDefault(Effect.succeed(DEFAULT_SIDEBAR_THREAD_PREVIEW_COUNT)),
+  ),
   timestampFormat: TimestampFormat.pipe(
     Schema.withDecodingDefault(Effect.succeed(DEFAULT_TIMESTAMP_FORMAT)),
   ),