feat(webui): add context window setting

webui/src/tests/settings-view.test.tsx

@@ -121,7 +121,7 @@ const installedAnyGen = {
 
 function renderSettingsView(
   options: {
-    initialSection?: "apps" | "advanced";
+    initialSection?: "apps" | "advanced" | "models";
     onSettingsChange?: (payload: SettingsPayload) => void;
   } = {},
 ) {
@@ -222,6 +222,29 @@ describe("SettingsView Apps catalog", () => {
     await waitFor(() => expect(onSettingsChange).toHaveBeenCalledWith(payload));
   });
 
+  it("shows context window options in model settings", async () => {
+    vi.stubGlobal(
+      "fetch",
+      vi.fn(async (input: RequestInfo | URL) => {
+        const url = String(input);
+        if (url === "/api/settings") return jsonResponse(settingsPayload());
+        if (url === "/api/settings/cli-apps") {
+          return jsonResponse({ apps: [], installed_count: 0 });
+        }
+        if (url === "/api/settings/mcp-presets") {
+          return jsonResponse({ presets: [], installed_count: 0 });
+        }
+        return { ok: false, status: 404, json: async () => ({}) } as Response;
+      }),
+    );
+
+    renderSettingsView({ initialSection: "models" });
+
+    expect(await screen.findByText("Context window")).toBeInTheDocument();
+    expect(screen.getByRole("button", { name: "64K" })).toBeInTheDocument();
+    expect(screen.getByRole("button", { name: "256K" })).toBeInTheDocument();
+  });
+
   it("saves network safety without exposing technical SSRF copy", async () => {
     const payload = settingsPayload();
     const fetchMock = vi.fn(async (input: RequestInfo | URL) => {