feat(#76): IMP-47B u11 frontend human_review surfacing (hunk-split from IMP-41)

- AiRepairStatus interface mirrors backend step20 u8 schema
- formatAiRepairHumanReviewMessage(): pure helper for the three failure axes
  (error / coverage_violated / unsupported_kind) — null on success/no-AI
- Home.tsx: toast.error(aiReviewMsg) after run completion
- FramePanel.tsx: reject-click window.confirm guard ("frame 유지 + AI 재구성")
- imp47b_human_review_toast.test.tsx: 6 vitest cases (null/false/3 axes/other)

Verification (frontend node_modules junction from main worktree):
- vitest imp47b_human_review_toast.test.tsx: 6/6 passed
- vitest full suite: 19/19 passed (imp41_application_mode 13 + u11 6, zero regression)

Hunk-split rationale:
- stash@{0} (imp47b-frontend-u11-pre-rebase, captured before IMP-41 merged)
  contained inline IMP-41 helpers alongside u11 changes
- HEAD already has IMP-41 helper-based implementation (buildBadgeTitle /
  mergeApplicationCandidates from services/applicationMode.ts, f358604)
- This commit adds ONLY the u11 surface on top of HEAD's IMP-41 baseline
- No IMP-41 hunk regression: buildBadgeTitle / mergeApplicationCandidates /
  applicationMode forwarding preserved verbatim

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Front/client/src/services/designAgentApi.ts

@@ -225,6 +225,31 @@ export interface FilteredSectionReason {
   position?: string | null;
 }
 
+export interface AiRepairStatus {
+  status: "ok" | "applied" | "unsupported_kind" | "coverage_violated" | "error" | string;
+  counts: {
+    total: number;
+    applied: number;
+    no_proposal: number;
+    no_zone_match: number;
+    unsupported_kind: number;
+    error: number;
+  };
+  unsupported_kind_records: Array<{
+    unit_index?: number | null;
+    source_section_ids: string[];
+    apply_status: string;
+  }>;
+  error_records: Array<{
+    unit_index?: number | null;
+    source_section_ids: string[];
+    error: string;
+  }>;
+  coverage_status: string;
+  dropped_section_ids: string[];
+  human_review_required: boolean;
+}
+
 export interface RunMeta {
   run_id: string;
   mdx_path: string;
@@ -239,6 +264,26 @@ export interface RunMeta {
   layout_candidates: string[]; // step07 layout_candidates list
   region_layout_candidates_by_zone: Record<string, string[]>;       // step08 placeholder
   display_strategy_candidates_by_zone: Record<string, string[]>;    // step08 placeholder
+  ai_repair_status: AiRepairStatus | null;
+}
+
+export function formatAiRepairHumanReviewMessage(
+  ai: AiRepairStatus | null | undefined,
+): string | null {
+  if (!ai || !ai.human_review_required) return null;
+  if (ai.status === "error") {
+    const n = ai.counts?.error ?? ai.error_records?.length ?? 0;
+    return `AI 재구성 호출 실패 (${n}건) — 다른 frame 선택 또는 수동 편집 필요`;
+  }
+  if (ai.status === "coverage_violated") {
+    const dropped = (ai.dropped_section_ids || []).join(", ");
+    return `AI 재구성 후 콘텐츠 누락 (dropped: ${dropped || "?"}) — 다른 frame 선택 또는 수동 편집 필요`;
+  }
+  if (ai.status === "unsupported_kind") {
+    const n = ai.counts?.unsupported_kind ?? ai.unsupported_kind_records?.length ?? 0;
+    return `AI 제안 형식 미지원 (${n}건) — 다른 frame 선택 또는 수동 편집 필요`;
+  }
+  return `AI 재구성 human_review 필요 (status: ${ai.status})`;
 }
 
 export interface LoadRunResult {
@@ -430,6 +475,7 @@ export async function loadRun(runId: string): Promise<LoadRunResult> {
         z.display_strategy_candidates ?? [],
       ])
     ),
+    ai_repair_status: (slideStatus.data?.ai_repair_status ?? null) as AiRepairStatus | null,
   };
 
   // ── NormalizedContent ──