fix(ai): make custom output token budget configurable

apps/desktop/src/stores/__tests__/settingsStore.spec.ts

@@ -669,6 +669,12 @@ describe("settingsStore AI API key normalization", () => {
   it("trims API keys when normalizing loaded configurations", () => {
     expect(normalizeAiConfig({ provider: "openai", apiKey: "  secret  " }).apiKey).toBe("secret");
   });
+  it("preserves and bounds a configured maximum output token budget", () => {
+    expect(normalizeAiConfig({ provider: "deepseek", maxOutputTokens: 32768 }).maxOutputTokens).toBe(32768);
+    expect(normalizeAiConfig({ provider: "deepseek", maxOutputTokens: 1_500_000 }).maxOutputTokens).toBe(1_000_000);
+    expect(normalizeAiConfig({ provider: "deepseek", maxOutputTokens: 128 }).maxOutputTokens).toBeUndefined();
+    expect(normalizeAiConfig({ provider: "deepseek", maxOutputTokens: Number.NaN }).maxOutputTokens).toBeUndefined();
+  });
 
   it("provides Kimi defaults and recognizes legacy Kimi configurations", () => {
     expect(AI_PROVIDER_PRESETS.kimi).toMatchObject({

apps/desktop/src/stores/settingsStore.ts

@@ -458,6 +458,8 @@ const defaultConfigs: Record<AiProvider, Omit<AiConfig, "apiKey">> = Object.from
 ) as Record<AiProvider, Omit<AiConfig, "apiKey">>;
 
 const AI_REASONING_LEVELS: AiReasoningLevel[] = ["default", "minimal", "low", "medium", "high", "xhigh", "max"];
+export const AI_OUTPUT_TOKENS_MIN = 256;
+export const AI_OUTPUT_TOKENS_MAX = 1_000_000;
 const AI_ENV_KEY_RE = /^[A-Za-z_][A-Za-z0-9_]*$/;
 
 function normalizeAiReasoningLevel(value: unknown): AiReasoningLevel {
@@ -488,6 +490,8 @@ export function normalizeAiHeaders(value: unknown): Record<string, string> {
 
 export function normalizeAiConfig(config: Partial<AiConfig> | null | undefined): AiConfig {
   const provider = config?.provider && config.provider in AI_PROVIDER_PRESETS ? config.provider : inferAiProviderFromConfig(config);
+  const rawMaxOutputTokens = config?.maxOutputTokens;
+  const maxOutputTokens = typeof rawMaxOutputTokens === "number" && Number.isFinite(rawMaxOutputTokens) && rawMaxOutputTokens >= AI_OUTPUT_TOKENS_MIN ? Math.min(AI_OUTPUT_TOKENS_MAX, Math.round(rawMaxOutputTokens)) : undefined;
   return {
     ...defaultConfigs[provider],
     ...config,
@@ -500,6 +504,7 @@ export function normalizeAiConfig(config: Partial<AiConfig> | null | undefined):
     proxyUrl: config?.proxyUrl ?? "",
     enableThinking: config?.enableThinking ?? true,
     reasoningLevel: normalizeAiReasoningLevel(config?.reasoningLevel),
+    maxOutputTokens,
     contextWindow: config?.contextWindow ?? undefined,
     codexCliPath: config?.codexCliPath?.trim() || undefined,
     codexCliEnv: normalizeAiEnv(config?.codexCliEnv),