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/pages/Home.tsx

@@ -21,6 +21,7 @@ import {
   runPipeline,
   loadRun,
   computeZonePositions,
+  formatAiRepairHumanReviewMessage,
   type RunMeta,
   type PipelineOverrides,
 } from "../services/designAgentApi";
@@ -370,6 +371,8 @@ export default function Home() {
       }));
       setRunMeta(runMeta);
       toast.success(`run "${result.run_id}" 완료 — ${runMeta.status}`);
+      const aiReviewMsg = formatAiRepairHumanReviewMessage(runMeta.ai_repair_status);
+      if (aiReviewMsg) toast.error(aiReviewMsg);
     } catch (err) {
       console.error(err);
       toast.error(