feat(#90): IMP-56 u20 BottomActions wiring to /api/connect + /api/export (replace placeholder toasts + standalone HTML download + cel mirror connect; pure builders exported for vitest)

Stage 2 final unit for Step 22 (user edit + export). u20 wires the previously
placeholder bottom-action footer to the u18 /api/connect and u19 /api/export
middlewares living in Front/vite.config.ts:

- BottomActions.tsx
  • drops the dead `serializeSlidePlan` import (TS2305 blocker since u14;
    project-wide `tsc --noEmit` now exits 0)
  • exports three pure builders for vitest (no jsdom / RTL devDep needed):
      buildConnectRequest(run_id, slug) -> POST /api/connect {run_id, slug}
      buildExportRequest(run_id)        -> POST /api/export  {run_id}
      buildDownloadFilename(run_id)     -> "<run_id>.html"
  • handleExport: POST -> blob -> a[download] click chain; toast on
    success / failure / network error.
  • handleConnect: derives slug via deriveUserOverridesKey(uploadedFile.name)
    and PUTs to u18 cel mirror; reports assets_copied count.
  • both buttons disable when runMeta is null so the UI cannot fire
    requests with an undefined run_id.

- Home.tsx
  • mounts <BottomActions/> in the footer with
    {slidePlan, runMeta, uploadedFile, isLoading, onGenerate}.
  • removes 2 of 3 placeholder `toast.info('… 준비 중입니다.')` buttons
    (LeftMdxPanel MDX-edit placeholder remains — out of u20 scope).
  • adds handleTextEdit (u15 wire to text_overrides axis) and
    handleStructureEdit (u15 wire to structure_overrides axis) to satisfy
    the SlideCanvas props introduced earlier in the u-series.

- imp90_bottom_actions.test.ts (new)
  • 11 vitest specs locking the builder URL + JSON shape against u18/u19
    middleware contracts. Verified 11/11 pass.

Stage 4 verification (all PASS):
  • u20 vitest: 11/11
  • u18/u19 endpoint vitest: 31/31
  • npx tsc --noEmit: exit 0 (carry-forward TS2305 resolved)
  • backend pytest (u1~u9 + u17 print mode, 9 files): 185/185

Out of scope:
  • LeftMdxPanel.tsx:333 MDX-edit placeholder toast (separate unit)
  • #1 / #72 / #74 / #79 / #80 / #81 / #93 closed dependencies (no re-impl)
  • AI-generated HTML structure (Phase Z regression guard)
  • frame swap via structure_overrides (locked to slot_order + hidden_slots)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Front/client/src/components/BottomActions.tsx

@@ -1,99 +1,200 @@
 /**
- * BottomActions - 하단 액션 버튼 영역
+ * BottomActions — Step 22 footer wire-up (IMP-56 #90 u20).
  *
- * 생성하기, 다운로드, 연동하기 버튼 컴포넌트
+ * Two real endpoints replace the prior placeholder toasts:
+ *   • POST /api/connect  (u18 / Front/vite.config.ts) — copies
+ *     data/runs/<run_id>/phase_z2/final.html + assets/ into the cel mirror
+ *     (`<CEL_PROJECT_ROOT>/public/slides/<slug>.html`).
+ *   • POST /api/export   (u19 / Front/vite.config.ts) — returns a standalone
+ *     text/html body with every `url(assets/...)` ref inlined as base64
+ *     data URLs. Response is piped into a Blob → a[download] click chain so
+ *     the user receives `<run_id>.html` portable for file:// or any host.
+ *
+ * The prior `serializeSlidePlan` JSON-download path was a dead reference
+ * (the export never existed in slidePlanUtils) and is removed here — the
+ * "다운로드" button now means standalone HTML download via /api/export.
+ * Both buttons disable when no run is loaded (runMeta == null) so the
+ * UI cannot fire requests with an undefined run_id.
  */
 
+import { useState } from "react";
 import { Sparkles, Download, Link2, Loader2 } from "lucide-react";
 import { Button } from "@/components/ui/button";
 import { toast } from "sonner";
-import type { SlidePlan, UserSelection } from "../types/designAgent";
-import { serializeSlidePlan } from "../utils/slidePlanUtils";
+import type { SlidePlan } from "../types/designAgent";
+import type { RunMeta } from "../services/designAgentApi";
+import { deriveUserOverridesKey } from "../utils/slidePlanUtils";
+
+// ─── pure request builders (exported for vitest; jsdom-free) ─────────────
+// The component below uses these verbatim. Each returns a {url, body} pair
+// so the test surface is the *literal* HTTP payload sent to the u18 / u19
+// middlewares — any future shape drift fails here before the network call.
+
+export function buildConnectRequest(
+  run_id: string,
+  slug: string,
+): { url: string; body: string } {
+  return {
+    url: "/api/connect",
+    body: JSON.stringify({ run_id, slug }),
+  };
+}
+
+export function buildExportRequest(
+  run_id: string,
+): { url: string; body: string } {
+  return {
+    url: "/api/export",
+    body: JSON.stringify({ run_id }),
+  };
+}
+
+export function buildDownloadFilename(run_id: string): string {
+  return `${run_id}.html`;
+}
 
 interface BottomActionsProps {
   slidePlan: SlidePlan | null;
-  userSelection: UserSelection;
+  runMeta: RunMeta | null;
+  uploadedFile: File | null;
   isLoading: boolean;
   onGenerate: () => void;
 }
 
 export default function BottomActions({
   slidePlan,
-  userSelection,
+  runMeta,
+  uploadedFile,
   isLoading,
   onGenerate,
 }: BottomActionsProps) {
-  const handleDownload = () => {
-    if (!slidePlan) {
-      toast.error("슬라이드 플랜이 없습니다. 먼저 생성하기를 눌러주세요.");
+  const [isConnecting, setIsConnecting] = useState(false);
+  const [isExporting, setIsExporting] = useState(false);
+
+  const runReady = !!runMeta && !!slidePlan;
+
+  const handleExport = async () => {
+    if (!runMeta) {
+      toast.error("Run 산출물이 없습니다. 먼저 생성하기를 눌러주세요.");
       return;
     }
-
-    const json = serializeSlidePlan(slidePlan, userSelection);
-    console.log("[Download] SlidePlan JSON:", json);
-
-    // JSON 파일 다운로드
-    const blob = new Blob([json], { type: "application/json" });
-    const url = URL.createObjectURL(blob);
+    setIsExporting(true);
+    try {
+      const exportReq = buildExportRequest(runMeta.run_id);
+      const resp = await fetch(exportReq.url, {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: exportReq.body,
+      });
+      if (!resp.ok) {
+        const text = await resp.text();
+        toast.error(`Export 실패 (${resp.status}): ${text.slice(0, 160)}`);
+        return;
+      }
+      const blob = await resp.blob();
+      const objectUrl = URL.createObjectURL(blob);
       const a = document.createElement("a");
-    a.href = url;
-    a.download = `slide-plan-${Date.now()}.json`;
+      a.href = objectUrl;
+      a.download = buildDownloadFilename(runMeta.run_id);
+      document.body.appendChild(a);
       a.click();
-    URL.revokeObjectURL(url);
-
-    toast.success("SlidePlan JSON이 다운로드되었습니다.");
+      a.remove();
+      URL.revokeObjectURL(objectUrl);
+      toast.success(`standalone HTML 다운로드 — ${runMeta.run_id}.html`);
+    } catch (err) {
+      toast.error(`Export 네트워크 오류: ${(err as Error).message}`);
+    } finally {
+      setIsExporting(false);
+    }
   };
 
-  const handleConnect = () => {
-    toast.info("연동하기 기능은 파이프라인 연결 후 활성화됩니다.");
+  const handleConnect = async () => {
+    if (!runMeta) {
+      toast.error("Run 산출물이 없습니다. 먼저 생성하기를 눌러주세요.");
+      return;
+    }
+    if (!uploadedFile) {
+      toast.error("MDX 파일이 없습니다 — slug 도출 불가.");
+      return;
+    }
+    const slug = deriveUserOverridesKey(uploadedFile.name);
+    setIsConnecting(true);
+    try {
+      const connectReq = buildConnectRequest(runMeta.run_id, slug);
+      const resp = await fetch(connectReq.url, {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: connectReq.body,
+      });
+      const payload = (await resp.json().catch(() => ({}))) as {
+        success?: boolean;
+        assets_copied?: number;
+        error?: string;
+      };
+      if (!resp.ok || !payload.success) {
+        toast.error(
+          `Connect 실패 (${resp.status}): ${payload.error ?? "unknown error"}`,
+        );
+        return;
+      }
+      toast.success(
+        `cel 미러 연동 완료 — ${slug}.html (assets ${payload.assets_copied ?? 0}개 복사)`,
+      );
+    } catch (err) {
+      toast.error(`Connect 네트워크 오류: ${(err as Error).message}`);
+    } finally {
+      setIsConnecting(false);
+    }
   };
 
   return (
-    <div className="flex items-center justify-center gap-3 px-6 py-3 bg-white border-t border-slate-200">
-      <div className="flex items-center gap-1.5 mr-2">
-        <span className="w-5 h-5 rounded-full bg-blue-600 text-white text-xs flex items-center justify-center font-bold">4</span>
-        <span className="text-xs text-slate-500 font-medium">액션</span>
-      </div>
-      {/* 생성하기 */}
+    <div className="flex items-center gap-3">
       <Button
         onClick={onGenerate}
         disabled={isLoading}
-        className="gap-2 min-w-[120px]"
+        className="gap-2 h-9 text-[11px] font-bold uppercase tracking-widest bg-slate-900 hover:bg-slate-800"
         size="default"
       >
         {isLoading ? (
           <>
-            <Loader2 className="w-4 h-4 animate-spin" />
+            <Loader2 className="w-3.5 h-3.5 animate-spin" />
             생성 중...
           </>
         ) : (
           <>
-            <Sparkles className="w-4 h-4" />
+            <Sparkles className="w-3.5 h-3.5" />
             생성하기
           </>
         )}
       </Button>
 
-      {/* 다운로드 */}
       <Button
         variant="outline"
-        onClick={handleDownload}
-        disabled={!slidePlan || isLoading}
-        className="gap-2 min-w-[120px]"
+        onClick={handleExport}
+        disabled={!runReady || isExporting || isLoading}
+        className="gap-2 h-9 text-[11px] font-bold uppercase tracking-widest border-slate-200"
         size="default"
       >
-        <Download className="w-4 h-4" />
+        {isExporting ? (
+          <Loader2 className="w-3.5 h-3.5 animate-spin" />
+        ) : (
+          <Download className="w-3.5 h-3.5" />
+        )}
         다운로드
       </Button>
 
-      {/* 연동하기 */}
       <Button
         variant="outline"
         onClick={handleConnect}
-        className="gap-2 min-w-[120px] text-slate-500"
+        disabled={!runReady || isConnecting || isLoading}
+        className="gap-2 h-9 text-[11px] font-bold uppercase tracking-widest border-slate-200"
         size="default"
       >
-        <Link2 className="w-4 h-4" />
+        {isConnecting ? (
+          <Loader2 className="w-3.5 h-3.5 animate-spin" />
+        ) : (
+          <Link2 className="w-3.5 h-3.5" />
+        )}
         연동하기
       </Button>
     </div>

Front/client/src/pages/Home.tsx

@@ -16,6 +16,8 @@ import {
   moveSectionToZone,
   saveZoneSizes,
   saveImageOverride,
+  saveTextOverride,
+  saveStructureOverride,
   deriveUserOverridesKey,
   applyPersistedNonFrameOverrides,
   remapPersistedFramesToZoneFrames,
@@ -41,8 +43,9 @@ import LeftMdxPanel from "../components/LeftMdxPanel";
 import SlideCanvas from "../components/SlideCanvas";
 import LayoutPanel from "../components/LayoutPanel";
 import FramePanel from "../components/FramePanel";
+import BottomActions from "../components/BottomActions";
 import {
-  Sparkles, Download, Link2, Loader2,
+  Sparkles, Loader2,
   CheckCircle2, HelpCircle,
 } from "lucide-react";
 import { Button } from "@/components/ui/button";
@@ -680,6 +683,51 @@ export default function Home() {
     setHasPendingChanges(true);
   }, []);
 
+  // IMP-56 (#90) u15 — wire SlideCanvas u13 focusout capture into the new
+  // `text_overrides` persist axis. Mirrors handleImageResize: merge the
+  // (zoneId, textPath, value) tick via `saveTextOverride` (u15 pure helper)
+  // and schedule the 300ms-debounced PUT under the `text_overrides` axis.
+  // Per-axis coalescing in `saveUserOverrides` collapses rapid edits in
+  // the same line into a single PUT; per-key buckets isolate cross-MDX.
+  const handleTextEdit = useCallback(
+    (capture: { zoneId: string; textPath: string; value: string }) => {
+      setState((p) => {
+        const nextSelection = saveTextOverride(
+          p.userSelection, capture.zoneId, capture.textPath, capture.value,
+        );
+        if (p.uploadedFile) {
+          const key = deriveUserOverridesKey(p.uploadedFile.name);
+          void saveUserOverrides(key, {
+            text_overrides: nextSelection.overrides.text_overrides,
+          });
+        }
+        return { ...p, userSelection: nextSelection };
+      });
+      setHasPendingChanges(true);
+    },
+    [],
+  );
+
+  // IMP-56 (#90) u15 — wire SlideCanvas u14 structure overlay capture into
+  // the `structure_overrides` axis. Scope-locked to {slot_order,
+  // hidden_slots} — frame swap stays on the existing `frames` axis.
+  const handleStructureEdit = useCallback(
+    (zoneId: string, perZone: { slot_order?: string[]; hidden_slots?: string[] }) => {
+      setState((p) => {
+        const nextSelection = saveStructureOverride(p.userSelection, zoneId, perZone);
+        if (p.uploadedFile) {
+          const key = deriveUserOverridesKey(p.uploadedFile.name);
+          void saveUserOverrides(key, {
+            structure_overrides: nextSelection.overrides.structure_overrides,
+          });
+        }
+        return { ...p, userSelection: nextSelection };
+      });
+      setHasPendingChanges(true);
+    },
+    [],
+  );
+
   // pending mode 일 때 effectiveSlidePlan = pendingZones 가 swap 된 plan.
   // 그 외 = state.slidePlan. 모든 zone / region lookup 이 일관되게 이걸 사용 →
   // pending mode 의 region.id ("pending-region-N") 가 zone_frames key 로 들어가
@@ -868,6 +916,9 @@ export default function Home() {
             onZoneResize={handleZoneResize}
             imageOverrides={state.userSelection.overrides.image_overrides}
             onImageResize={handleImageResize}
+            onTextEdit={handleTextEdit}
+            structureOverrides={state.userSelection.overrides.structure_overrides}
+            onStructureEdit={handleStructureEdit}
           />
         </main>
 
@@ -910,11 +961,13 @@ export default function Home() {
             <span className="text-[10px] font-bold text-slate-500 uppercase tracking-tighter">Phase Z Engine Active</span>
           </div>
         </div>
-        <div className="flex items-center gap-3">
-          <Button variant="outline" onClick={() => toast.info("연동하기 기능은 준비 중입니다.")} className="gap-2 h-9 text-[11px] font-bold uppercase tracking-widest border-slate-200"><Link2 className="w-3.5 h-3.5" />Connect</Button>
-          <Button variant="outline" onClick={() => toast.info("다운로드 기능은 준비 중입니다.")} disabled={!state.slidePlan} className="gap-2 h-9 text-[11px] font-bold uppercase tracking-widest border-slate-200"><Download className="w-3.5 h-3.5" />Download</Button>
-          <Button onClick={() => toast.success("슬라이드 설정이 확정되었습니다.")} disabled={!state.slidePlan || state.isLoading} className="gap-2 h-9 text-[11px] font-bold uppercase tracking-widest bg-slate-900 hover:bg-slate-800"><Sparkles className="w-3.5 h-3.5" />Finalize Slide</Button>
-        </div>
+        <BottomActions
+          slidePlan={state.slidePlan}
+          runMeta={runMeta}
+          uploadedFile={state.uploadedFile}
+          isLoading={state.isLoading}
+          onGenerate={handleGenerate}
+        />
       </footer>
     </div>
   );

Front/client/tests/imp90_bottom_actions.test.ts

@@ -0,0 +1,90 @@
+// IMP-56 (#90) u20 — vitest coverage for the pure request builders exported
+// by `BottomActions`. The React component itself is not rendered (jsdom /
+// @testing-library NOT in Front devDependencies — verified against the prior
+// u14 `imp90_structure_overlay.test.tsx` pattern); we test the deterministic
+// pieces that drive the network payload sent to the u18 / u19 middlewares.
+//
+// Upstream / downstream contracts (verified by prior units):
+//   - u18 /api/connect : body shape = { run_id, slug } (Front/vite.config.ts
+//          handleConnectMirror — `imp90_connect_endpoint.test.ts`).
+//   - u19 /api/export  : body shape = { run_id }; response = raw text/html
+//          with `Content-Disposition: attachment; filename="<run_id>.html"`
+//          (Front/vite.config.ts handleExportStandalone —
+//          `imp90_export_endpoint.test.ts`).
+//
+// u20 scope: builders only. Any drift in URL or JSON shape fails here before
+// the request leaves the client. Toast / fetch / blob plumbing is not tested
+// (it would require jsdom + a fetch mock; the existing server-side tests
+// already pin the wire contract).
+
+import { describe, it, expect } from "vitest";
+import {
+  buildConnectRequest,
+  buildExportRequest,
+  buildDownloadFilename,
+} from "../src/components/BottomActions";
+
+describe("buildConnectRequest", () => {
+  it("targets /api/connect", () => {
+    const { url } = buildConnectRequest("run_42", "mdx_03");
+    expect(url).toBe("/api/connect");
+  });
+
+  it("emits { run_id, slug } JSON body — matches u18 middleware shape", () => {
+    const { body } = buildConnectRequest("run_42", "mdx_03");
+    expect(JSON.parse(body)).toEqual({ run_id: "run_42", slug: "mdx_03" });
+  });
+
+  it("preserves zero-length and unicode run_id verbatim (server validates)", () => {
+    const { body } = buildConnectRequest("", "x");
+    expect(JSON.parse(body)).toEqual({ run_id: "", slug: "x" });
+    const { body: uni } = buildConnectRequest("런", "슬러그");
+    expect(JSON.parse(uni)).toEqual({ run_id: "런", slug: "슬러그" });
+  });
+
+  it("does not leak extra keys (frame swap / overrides etc.)", () => {
+    const { body } = buildConnectRequest("r", "s");
+    expect(Object.keys(JSON.parse(body)).sort()).toEqual(["run_id", "slug"]);
+  });
+});
+
+describe("buildExportRequest", () => {
+  it("targets /api/export", () => {
+    const { url } = buildExportRequest("run_42");
+    expect(url).toBe("/api/export");
+  });
+
+  it("emits { run_id } JSON body — matches u19 middleware shape", () => {
+    const { body } = buildExportRequest("run_42");
+    expect(JSON.parse(body)).toEqual({ run_id: "run_42" });
+  });
+
+  it("does not leak extra keys (slug / format etc.)", () => {
+    const { body } = buildExportRequest("r");
+    expect(Object.keys(JSON.parse(body))).toEqual(["run_id"]);
+  });
+
+  it("preserves zero-length and unicode run_id verbatim (server validates)", () => {
+    expect(JSON.parse(buildExportRequest("").body)).toEqual({ run_id: "" });
+    expect(JSON.parse(buildExportRequest("런").body)).toEqual({ run_id: "런" });
+  });
+});
+
+describe("buildDownloadFilename", () => {
+  it("returns <run_id>.html for the a[download] click chain", () => {
+    expect(buildDownloadFilename("run_42")).toBe("run_42.html");
+  });
+
+  it("appends exactly one .html suffix even when run_id already ends in .html", () => {
+    // The server-side `Content-Disposition` already carries the same
+    // filename; we mirror it verbatim so browser default behavior wins.
+    // We intentionally do NOT strip a trailing `.html` — run_id is the
+    // backend's `Path(args.mdx_path).stem`-style key, which never contains
+    // a dot suffix (validated by `isValidUserOverridesKey` at u18/u19).
+    expect(buildDownloadFilename("foo.html")).toBe("foo.html.html");
+  });
+
+  it("returns just .html for empty run_id (server rejects upstream)", () => {
+    expect(buildDownloadFilename("")).toBe(".html");
+  });
+});