feat(style-acq T14): שער-יו"ר לאישור הצעות-curator → הטמעה לפרופיל

סוגר את הלולאה מקצה-לקצה (INV-G10/LRN1): ה-curator מציע (status=analyzed),
היו"ר מאשרת, והלקחים נכתבים לערוצים שהכותב צורך (T15) — אין auto-commit.

- db.get_draft_final_pair(id) — שורת-פנקס מלאה כולל analysis.
- app.py: GET /api/learning/pairs/{id} (חושף רק changes מסוג style_method —
  INV-LRN5) + POST .../promote (לקחים→discussion_rules['universal'],
  ביטויים→transition_phrases['universal'] דרך merge ל-appeal_type_rules;
  status→lessons_folded). _append_methodology_override משותף.
- web-ui: usePairDetail/usePromoteLearning + ProposalReview (בחירת לקחים/
  ביטויים לאימוץ) בטאב "למידה" עבור pairs במצב analyzed.

INV-G10 (שער-יו"ר) · INV-LRN1 (אין auto-commit) · INV-LRN5 (טוהר).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web-ui/src/lib/api/learning.ts

@@ -3,7 +3,7 @@
  * Backs the /training "למידה" tab. Endpoints under /api/learning.
  */
 
-import { useQuery } from "@tanstack/react-query";
+import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
 import { apiRequest } from "./client";
 
 export type DraftFinalPair = {
@@ -67,3 +67,50 @@ export function useStyleDistance(caseNumber: string | null) {
     staleTime: 15_000,
   });
 }
+
+// ── T14: curator distillation proposal + chair approval gate ──────
+
+export type DistillationChange = {
+  type?: string;
+  domain?: string;
+  block?: string;
+  description?: string;
+  draft_text?: string;
+  final_text?: string;
+  lesson?: string;
+};
+
+export type PairDetail = {
+  id: string;
+  case_number: string;
+  title: string;
+  status: string;
+  diff_stats: { change_percent?: number } | null;
+  overall_assessment: string;
+  changes: DistillationChange[];     // style_method only (server-filtered)
+  new_expressions: string[];
+};
+
+export function usePairDetail(pairId: string | null) {
+  return useQuery({
+    queryKey: [...learningKeys.all, "pair", pairId ?? ""] as const,
+    queryFn: ({ signal }) =>
+      apiRequest<PairDetail>(`/api/learning/pairs/${pairId}`, { signal }),
+    enabled: Boolean(pairId),
+    staleTime: 15_000,
+  });
+}
+
+export function usePromoteLearning(pairId: string) {
+  const qc = useQueryClient();
+  return useMutation({
+    mutationFn: (body: { lessons: string[]; phrases: string[] }) =>
+      apiRequest<{ id: string; status: string; folded_lessons: number; folded_phrases: number }>(
+        `/api/learning/pairs/${pairId}/promote`,
+        { method: "POST", body },
+      ),
+    onSuccess: () => {
+      qc.invalidateQueries({ queryKey: learningKeys.all });
+    },
+  });
+}