feat(translator): lift useTranslateSession to shell + connect PipelineView to real result

- Move useTranslateSession() to TranslatorPageClient (shell level) for PipelineView to receive real steps
- Build PipelineStep[] from session result (detected/intermediate/translated/response)
- Pass session as prop down to TranslateTab; internal hook kept for isolated test compatibility
- Dedup useProviderOptions: only TranslateTab calls the hook, props pass to SimpleControls
- Remove unused data-advanced-section/data-input-text placeholder (DOM data leak GAP-5)
- Add aria-expanded + aria-controls to AutoFeaturesCard toggle (a11y GAP-2)

Addresses code review RISCO-4, GAP-2, GAP-3, GAP-5.

src/app/(dashboard)/dashboard/translator/TranslatorPageClient.tsx

@@ -1,6 +1,6 @@
 "use client";
 
-import { Suspense, useState } from "react";
+import { Suspense, useMemo, useState } from "react";
 import { useTranslations } from "next-intl";
 import { Badge, Card, SegmentedControl } from "@/shared/components";
 import TranslatorConceptCard from "./components/TranslatorConceptCard";
@@ -9,10 +9,12 @@ import MonitorTab from "./components/MonitorTab";
 import AdvancedSection from "./components/advanced/AdvancedSection";
 import RawJsonPanel from "./components/advanced/RawJsonPanel";
 import PipelineView from "./components/advanced/PipelineView";
+import type { PipelineStep } from "./components/advanced/PipelineView";
 import StreamTransformerAccordion from "./components/advanced/StreamTransformerAccordion";
 import TestBenchAccordion from "./components/advanced/TestBenchAccordion";
 import CompressionPreviewAccordion from "./components/advanced/CompressionPreviewAccordion";
 import { useTranslateDeepLink } from "./hooks/useTranslateDeepLink";
+import { useTranslateSession } from "./hooks/useTranslateSession";
 import type { AdvancedSlug, TranslatorTab } from "./types";
 
 export default function TranslatorPageClient() {
@@ -28,6 +30,9 @@ function TranslatorPageClientInner() {
   const [sharedInputContent, setSharedInputContent] = useState("");
   const { state, setTab, setAdvanced } = useTranslateDeepLink();
 
+  // Lift session to shell so PipelineView can receive real steps
+  const session = useTranslateSession();
+
   const makeOpenHandler = (slug: AdvancedSlug) => (open: boolean) => {
     if (open) {
       setAdvanced(slug);
@@ -36,6 +41,80 @@ function TranslatorPageClientInner() {
     }
   };
 
+  const tr = (key: string, fallback: string): string => {
+    try {
+      const v = t(key as Parameters<typeof t>[0]);
+      if (v === key || v === `translator.${key}`) return fallback;
+      return v as string;
+    } catch {
+      return fallback;
+    }
+  };
+
+  // Build PipelineStep[] from session.result so PipelineView reflects real state
+  const pipelineSteps = useMemo<PipelineStep[]>(() => {
+    const r = session.result;
+    if (r.status === "idle") return [];
+
+    const steps: PipelineStep[] = [];
+
+    // Step 1 — Client Request (always present once started)
+    steps.push({
+      id: "1",
+      name: tr("pipelineStepClientRequest", "Client Request"),
+      description: tr("pipelineStepClientRequestDesc", "Request received in client format"),
+      format: r.detected ?? "openai",
+      content: sharedInputContent.slice(0, 500),
+      status: r.status === "error" ? "error" : "done",
+    });
+
+    // Step 2 — Format Detected
+    steps.push({
+      id: "2",
+      name: tr("pipelineStepFormatDetected", "Format Detected"),
+      description: tr("pipelineStepFormatDetectedDesc", "Auto-detected source format"),
+      format: r.detected ?? null,
+      content: r.detected ? JSON.stringify({ detectedFormat: r.detected, confidence: "high" }, null, 2) : "",
+      status: r.detected ? "done" : r.status === "translating" ? "active" : "pending",
+    });
+
+    // Step 3 — OpenAI Intermediate (only when hub-and-spoke)
+    if (r.pipelinePath === "hub-and-spoke") {
+      steps.push({
+        id: "3",
+        name: tr("pipelineStepOpenAIIntermediate", "OpenAI Intermediate"),
+        description: tr("pipelineStepOpenAIIntermediateDesc", "Translated to OpenAI hub format"),
+        format: "openai",
+        content: r.intermediateJson ?? "",
+        status: r.intermediateJson ? "done" : r.status === "translating" ? "active" : "pending",
+      });
+    }
+
+    // Step 4 — Provider Format (translated result)
+    steps.push({
+      id: r.pipelinePath === "hub-and-spoke" ? "4" : "3",
+      name: tr("pipelineStepProviderFormat", "Provider Format"),
+      description: tr("pipelineStepProviderFormatDesc", "Translated to provider target format"),
+      format: r.target,
+      content: r.translatedJson ?? "",
+      status: r.translatedJson ? "done" : r.status === "translating" ? "active" : "pending",
+    });
+
+    // Step 5 — Provider Response (only when mode=send and response present)
+    if (r.responsePreview !== null) {
+      steps.push({
+        id: r.pipelinePath === "hub-and-spoke" ? "5" : "4",
+        name: tr("pipelineStepProviderResponse", "Provider Response"),
+        description: tr("pipelineStepProviderResponseDesc", "Streaming response from provider"),
+        format: "openai",
+        content: r.responsePreview,
+        status: r.status === "ok" ? "done" : r.status === "sending" ? "active" : "pending",
+      });
+    }
+
+    return steps;
+  }, [session.result, sharedInputContent]);
+
   const advancedSlot = (
     <AdvancedSection forceOpenSlug={state.advanced}>
       <RawJsonPanel
@@ -47,7 +126,7 @@ function TranslatorPageClientInner() {
         slug="pipeline"
         forceOpen={state.advanced === "pipeline"}
         onOpenChange={makeOpenHandler("pipeline")}
-        steps={[]}
+        pipelineSteps={pipelineSteps.length > 0 ? pipelineSteps : undefined}
       />
       <StreamTransformerAccordion
         forceOpen={state.advanced === "streamtransform"}
@@ -92,6 +171,7 @@ function TranslatorPageClientInner() {
         <TranslateTab
           forceOpenAdvancedSlug={state.advanced}
           onAdvancedSlugChange={(slug) => setAdvanced(slug)}
+          session={session}
         />
       )}
 
@@ -111,7 +191,10 @@ function AutoFeaturesCard() {
   return (
     <Card className="border-primary/10 bg-primary/5">
       <button
+        type="button"
         onClick={() => setShowFeatures((prev) => !prev)}
+        aria-expanded={showFeatures}
+        aria-controls="auto-features-grid"
         className="flex w-full items-center justify-between p-4 text-left"
       >
         <div className="flex items-center gap-2">
@@ -130,6 +213,7 @@ function AutoFeaturesCard() {
 
       {showFeatures && (
         <div
+          id="auto-features-grid"
           className="grid grid-cols-1 gap-3 px-4 pb-4 sm:grid-cols-2 lg:grid-cols-4"
           data-testid="auto-features-grid"
         >

src/app/(dashboard)/dashboard/translator/components/SimpleControls.tsx

@@ -5,7 +5,6 @@ import { useTranslations } from "next-intl";
 import { Button, Select, SegmentedControl } from "@/shared/components";
 import { InfoTooltip } from "@/shared/components";
 import { FORMAT_OPTIONS, FORMAT_META, getExampleTemplates } from "../exampleTemplates";
-import { useProviderOptions } from "../hooks/useProviderOptions";
 import type { FormatId, TranslateMode } from "../types";
 
 interface SimpleControlsProps {
@@ -22,6 +21,8 @@ interface SimpleControlsProps {
   onSubmit: () => void;
   onOpenAdvanced: () => void;
   isLoading?: boolean;
+  providerOptions: Array<{ value: string; label: string }>;
+  loading?: boolean;
 }
 
 export default function SimpleControls({
@@ -38,9 +39,10 @@ export default function SimpleControls({
   onSubmit,
   onOpenAdvanced,
   isLoading = false,
+  providerOptions,
+  loading = false,
 }: SimpleControlsProps) {
   const t = useTranslations("translator");
-  const { providerOptions } = useProviderOptions(provider);
 
   const tr = useCallback(
     (key: string, fallback: string): string => {
@@ -150,6 +152,7 @@ export default function SimpleControls({
             options={providerOptions.length > 0 ? providerOptions : [{ value: provider, label: provider }]}
             value={provider}
             onChange={handleProviderChange}
+            disabled={loading}
           />
         </div>
       </div>

src/app/(dashboard)/dashboard/translator/components/TranslateTab.tsx

@@ -3,6 +3,7 @@
 import { useState } from "react";
 import { Card } from "@/shared/components";
 import { useTranslateSession } from "../hooks/useTranslateSession";
+import type { UseTranslateSessionReturn } from "../hooks/useTranslateSession";
 import { useProviderOptions } from "../hooks/useProviderOptions";
 import SimpleControls from "./SimpleControls";
 import ResultNarrated from "./ResultNarrated";
@@ -19,11 +20,18 @@ interface TranslateTabProps {
    * (open or close). F9 syncs this with the URL query string.
    */
   onAdvancedSlugChange?: (slug: AdvancedSlug | null) => void;
+  /**
+   * Optional session lifted from shell (TranslatorPageClient) so PipelineView
+   * can read the result at the shell level. When undefined, an internal session
+   * is used (isolated rendering mode, e.g. tests).
+   */
+  session?: UseTranslateSessionReturn;
 }
 
 export default function TranslateTab({
   forceOpenAdvancedSlug = null,
   onAdvancedSlugChange,
+  session: sessionProp,
 }: TranslateTabProps) {
   // Internal simple-mode state
   const [source, setSource] = useState<FormatId>("claude");
@@ -31,11 +39,14 @@ export default function TranslateTab({
   const [mode, setMode] = useState<TranslateMode>("send");
 
   // Provider/target state: derive from useProviderOptions
-  const { provider, setProvider, providerOptions } = useProviderOptions("openai");
+  // GAP-3: useProviderOptions lives only here; SimpleControls receives it as props
+  const { provider, setProvider, providerOptions, loading } = useProviderOptions("openai");
   // target FormatId mirrors provider selection; managed via SimpleControls callback
   const [target, setTarget] = useState<FormatId>("openai");
 
-  const { result, run } = useTranslateSession();
+  // Rules of Hooks: always call unconditionally; fall back to prop when provided
+  const internalSession = useTranslateSession();
+  const { result, run } = sessionProp ?? internalSession;
 
   const handleSubmit = () => {
     run({ source, target, provider, inputText, mode });
@@ -45,11 +56,6 @@ export default function TranslateTab({
     if (onAdvancedSlugChange) {
       onAdvancedSlugChange(slug);
     }
-    // Scroll to advanced section if it exists (guard for environments without scrollIntoView)
-    const advancedEl = document.querySelector("[data-advanced-section]");
-    if (advancedEl && typeof advancedEl.scrollIntoView === "function") {
-      advancedEl.scrollIntoView({ behavior: "smooth", block: "start" });
-    }
   };
 
   const handleSeeTranslatedJson = () => {
@@ -60,10 +66,6 @@ export default function TranslateTab({
     handleOpenAdvanced("pipeline");
   };
 
-  // Expose forceOpenAdvancedSlug to the advanced section slot via data attribute
-  // F4 will read this; for now we write it to a data attribute that F9 will wire
-  const advancedSlug = forceOpenAdvancedSlug;
-
   // Sync provider options: when providerOptions loads, keep provider in sync
   // (useProviderOptions handles this internally; we just need to expose setProvider)
   const handleProviderChange = (prov: string) => {
@@ -90,6 +92,8 @@ export default function TranslateTab({
             onSubmit={handleSubmit}
             onOpenAdvanced={() => handleOpenAdvanced("rawjson")}
             isLoading={result.status === "translating" || result.status === "sending"}
+            providerOptions={providerOptions}
+            loading={loading}
           />
         </Card>
 
@@ -100,17 +104,6 @@ export default function TranslateTab({
           onSeePipeline={handleSeePipeline}
         />
       </div>
-
-      {/* Advanced section slot — F4 will mount AdvancedSection here.
-          F9 composes: <TranslateTab onAdvancedSlugChange={...} /> + <AdvancedSection forceOpenSlug={...} />.
-          For now we render the placeholder that F4/F9 will replace. */}
-      <div
-        data-advanced-section
-        data-force-open-slug={advancedSlug ?? ""}
-        data-provider-options={JSON.stringify(providerOptions.map((o) => o.value))}
-        data-source={source}
-        data-input-text={inputText.slice(0, 100)}
-      />
     </div>
   );
 }

tests/unit/translator-friendly-integration.test.tsx

@@ -80,6 +80,28 @@ vi.mock("@/shared/components", () => ({
   ),
 }));
 
+// ── useTranslateSession stub (now lifted to shell) ────────────────────────────
+vi.mock(
+  "@/app/(dashboard)/dashboard/translator/hooks/useTranslateSession",
+  () => ({
+    useTranslateSession: () => ({
+      result: {
+        detected: null,
+        target: "openai",
+        status: "idle",
+        responsePreview: null,
+        translatedJson: null,
+        pipelinePath: null,
+        intermediateJson: null,
+        errorMessage: null,
+        latencyMs: null,
+      },
+      run: vi.fn(),
+      reset: vi.fn(),
+    }),
+  }),
+);
+
 // ── Sub-component stubs that capture received props ───────────────────────────
 const capturedTranslateTabProps: Array<{
   forceOpenAdvancedSlug?: string | null;
@@ -100,6 +122,7 @@ vi.mock(
     }: {
       forceOpenAdvancedSlug?: string | null;
       onAdvancedSlugChange?: (slug: string | null) => void;
+      session?: unknown;
     }) => {
       capturedTranslateTabProps.push({ forceOpenAdvancedSlug });
       return (
@@ -154,7 +177,7 @@ vi.mock(
 vi.mock(
   "@/app/(dashboard)/dashboard/translator/components/advanced/PipelineView",
   () => ({
-    default: ({ forceOpen }: { forceOpen?: boolean; steps?: unknown[] }) => (
+    default: ({ forceOpen }: { forceOpen?: boolean; pipelineSteps?: unknown[] }) => (
       <div data-testid="pipeline-view" data-force-open={String(forceOpen ?? false)} />
     ),
   }),

tests/unit/translator-friendly-page-client.test.tsx

@@ -94,6 +94,28 @@ vi.mock("@/shared/components", () => ({
   ),
 }));
 
+// ── useTranslateSession stub (now lifted to shell) ────────────────────────────
+vi.mock(
+  "@/app/(dashboard)/dashboard/translator/hooks/useTranslateSession",
+  () => ({
+    useTranslateSession: () => ({
+      result: {
+        detected: null,
+        target: "openai",
+        status: "idle",
+        responsePreview: null,
+        translatedJson: null,
+        pipelinePath: null,
+        intermediateJson: null,
+        errorMessage: null,
+        latencyMs: null,
+      },
+      run: vi.fn(),
+      reset: vi.fn(),
+    }),
+  }),
+);
+
 // ── Sub-component stubs ───────────────────────────────────────────────────────
 vi.mock(
   "@/app/(dashboard)/dashboard/translator/components/TranslatorConceptCard",
@@ -111,6 +133,7 @@ vi.mock(
     }: {
       forceOpenAdvancedSlug?: string | null;
       onAdvancedSlugChange?: (slug: string | null) => void;
+      session?: unknown;
     }) => (
       <div
         data-testid="translate-tab"
@@ -159,7 +182,7 @@ vi.mock(
 vi.mock(
   "@/app/(dashboard)/dashboard/translator/components/advanced/PipelineView",
   () => ({
-    default: ({ forceOpen }: { forceOpen?: boolean }) => (
+    default: ({ forceOpen }: { forceOpen?: boolean; pipelineSteps?: unknown[] }) => (
       <div data-testid="pipeline-view" data-force-open={String(forceOpen ?? false)} />
     ),
   }),

tests/unit/translator-friendly-simple-controls.test.tsx

@@ -88,22 +88,6 @@ vi.mock("@/shared/components", () => ({
   ),
 }));
 
-// --- Mock useProviderOptions ---
-vi.mock(
-  "@/app/(dashboard)/dashboard/translator/hooks/useProviderOptions",
-  () => ({
-    useProviderOptions: () => ({
-      provider: "openai",
-      setProvider: vi.fn(),
-      providerOptions: [
-        { value: "openai", label: "OpenAI" },
-        { value: "anthropic", label: "Anthropic" },
-      ],
-      loading: false,
-    }),
-  })
-);
-
 // --- Mock useAvailableModels ---
 vi.mock(
   "@/app/(dashboard)/dashboard/translator/hooks/useAvailableModels",
@@ -180,6 +164,8 @@ function makeProps(overrides: Partial<{
   onSubmit: () => void;
   onOpenAdvanced: () => void;
   isLoading: boolean;
+  providerOptions: Array<{ value: string; label: string }>;
+  loading: boolean;
 }> = {}) {
   return {
     source: "claude" as FormatId,
@@ -195,6 +181,8 @@ function makeProps(overrides: Partial<{
     onSubmit: vi.fn(),
     onOpenAdvanced: vi.fn(),
     isLoading: false,
+    providerOptions: [{ value: "openai", label: "OpenAI" }, { value: "anthropic", label: "Anthropic" }],
+    loading: false,
     ...overrides,
   };
 }

tests/unit/translator-friendly-translate-tab.test.tsx

@@ -197,7 +197,7 @@ describe("TranslateTab", () => {
     expect(gridEl?.className).toContain("lg:grid-cols-2");
   });
 
-  it("renders the advanced section slot (data-advanced-section)", async () => {
+  it("does not expose data-advanced-section placeholder div (GAP-5)", async () => {
     const { default: TranslateTab } = await import(
       "@/app/(dashboard)/dashboard/translator/components/TranslateTab"
     );
@@ -206,8 +206,8 @@ describe("TranslateTab", () => {
     await act(async () => {
       root.render(<TranslateTab />);
     });
-    const advancedSlot = container.querySelector("[data-advanced-section]");
-    expect(advancedSlot).toBeTruthy();
+    // GAP-5: the data-advanced-section DOM data-leak placeholder must not exist
+    expect(container.querySelector("[data-advanced-section]")).toBeNull();
   });
 
   it("calls onAdvancedSlugChange with 'rawjson' when the Advanced button is clicked", async () => {
@@ -233,37 +233,6 @@ describe("TranslateTab", () => {
     expect(onAdvancedSlugChange).toHaveBeenCalledWith("rawjson");
   });
 
-  it("reflects forceOpenAdvancedSlug in data attribute", async () => {
-    const { default: TranslateTab } = await import(
-      "@/app/(dashboard)/dashboard/translator/components/TranslateTab"
-    );
-    const container = makeContainer();
-    const root = createRoot(container);
-    const slug: AdvancedSlug = "pipeline";
-    await act(async () => {
-      root.render(
-        <TranslateTab forceOpenAdvancedSlug={slug} onAdvancedSlugChange={vi.fn()} />
-      );
-    });
-    const advancedSlot = container.querySelector("[data-advanced-section]");
-    expect(advancedSlot?.getAttribute("data-force-open-slug")).toBe("pipeline");
-  });
-
-  it("forceOpenAdvancedSlug=null results in empty data attribute", async () => {
-    const { default: TranslateTab } = await import(
-      "@/app/(dashboard)/dashboard/translator/components/TranslateTab"
-    );
-    const container = makeContainer();
-    const root = createRoot(container);
-    await act(async () => {
-      root.render(
-        <TranslateTab forceOpenAdvancedSlug={null} onAdvancedSlugChange={vi.fn()} />
-      );
-    });
-    const advancedSlot = container.querySelector("[data-advanced-section]");
-    expect(advancedSlot?.getAttribute("data-force-open-slug")).toBe("");
-  });
-
   it("renders without onAdvancedSlugChange prop (optional)", async () => {
     const { default: TranslateTab } = await import(
       "@/app/(dashboard)/dashboard/translator/components/TranslateTab"