fix(#75): IMP-47A mdx03 frontend execution stabilization (u1~u4)

u1: SlideCanvas iframe sandbox += allow-scripts (allow-same-origin preserved)
    → embedded-mode script in slide_base.html now applies html.embedded
    → standalone CSS reset deactivates inside iframe; no clipping
u2: designAgentApi.loadRun merges candidate_evidence + v4_all_judgments
    + v4_candidates via Map<template_id|id|frame_id> dedup,
    LABEL_PRIORITY (use_as_is<light_edit<restructure<reject) then
    confidence desc, capped TOP_N_FRAMES=6
u3: Home.handleGenerate useCallback deps = [uploadedFile, slidePlan,
    userSelection, pendingZones, pendingLayout] (5-tuple, stale-closure fix)
u4: tests/manual/imp47a_e2e.md — mdx03 manual e2e spec (5 axes)

Frontend-only. Backend src/ untouched. No template/catalog edits.
Determinism preserved (no LLM in frontend merge logic).
Baseline: pytest -q tests → 623 passed.

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

Front/client/src/components/SlideCanvas.tsx

@@ -293,7 +293,7 @@ export default function SlideCanvas({
               title="Phase Z 렌더 결과"
               className="w-full h-full border-0 block"
               scrolling="no"
-              sandbox="allow-same-origin"
+              sandbox="allow-same-origin allow-scripts"
               style={{ pointerEvents: isEditMode ? "auto" : "none" }}
               onLoad={(e) => {
                 // IMP-14 (Step 13 A-4) — embedded vs standalone CSS reset 은 backend

Front/client/src/pages/Home.tsx

@@ -377,7 +377,7 @@ export default function Home() {
       );
       setState((p) => ({ ...p, isLoading: false }));
     }
-  }, [state.uploadedFile]);
+  }, [state.uploadedFile, state.slidePlan, state.userSelection, pendingZones, pendingLayout]);
 
   // ── 섹션 드래그 앤 드롭 (Zone으로 재배치) ──
   const handleSectionDrop = useCallback((sectionId: string, zoneId: string) => {

Front/client/src/services/designAgentApi.ts

@@ -511,12 +511,17 @@ export async function loadRun(runId: string): Promise<LoadRunResult> {
     const candidateEvidence = Array.isArray(unit.candidate_evidence)
       ? unit.candidate_evidence
       : [];
-    const rawSource =
-      candidateEvidence.length > 0
-        ? candidateEvidence
-        : (unit.v4_all_judgments?.length > 0
-            ? unit.v4_all_judgments
-            : (unit.v4_candidates ?? []));
+    const candidateMap = new Map<string, any>();
+    const pushCandidate = (c: any) => {
+      if (!c) return;
+      const key = c.template_id ?? c.id ?? c.frame_id;
+      if (!key) return;
+      if (!candidateMap.has(key)) candidateMap.set(key, c);
+    };
+    candidateEvidence.forEach(pushCandidate);
+    (unit.v4_all_judgments ?? []).forEach(pushCandidate);
+    (unit.v4_candidates ?? []).forEach(pushCandidate);
+    const rawSource = Array.from(candidateMap.values());
     const v4Source = [...rawSource].sort((a: any, b: any) => {
       const lp = (LABEL_PRIORITY[a.label] ?? 99) - (LABEL_PRIORITY[b.label] ?? 99);
       if (lp !== 0) return lp;