feat(style-acq T6+T13): פנקס-התאמה + מדד מרחק-סגנון ב-UI

ה"איך מנהלים/רואים את הלמידה": טאב "למידה" ב-/training.

- app.py: GET /api/learning/pairs (פנקס-ההתאמה — כל ההחלטות + סטטוס draft↔final,
  INV-LRN4) + GET /api/learning/style-distance/{case} (מדד T7).
- web-ui: learning.ts hooks + LearningPanel (טבלת פנקס; לחיצה על תיק →
  מדד מרחק-הסגנון: שינוי draft→final, סטיית יחסי-זהב, אנטי-דפוסים) + טאב ב-/training.

מכסה גם את T6 (רשימת כל ההחלטות הנסגרות מול הסופי). ללא endpoint-schema חדש
לטיפוסים מחוללים (טיפוסים ידניים). G9, INV-LRN4.

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

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

@@ -0,0 +1,69 @@
+/**
+ * Style-acquisition learning surface (T6/T13) — reconciliation ledger + style-distance.
+ * Backs the /training "למידה" tab. Endpoints under /api/learning.
+ */
+
+import { useQuery } from "@tanstack/react-query";
+import { apiRequest } from "./client";
+
+export type DraftFinalPair = {
+  id: string;
+  case_id: string | null;
+  case_number: string;
+  title: string;
+  status: "final_received" | "analyzed" | "lessons_folded" | string;
+  change_percent: number | null;
+  created_at: string | null;
+  updated_at: string | null;
+};
+
+export type StyleDistance = {
+  case_number: string;
+  outcome: string;
+  golden_ratio_adherence: {
+    outcome: string;
+    total_words: number;
+    sections: Record<string, { actual_pct: number; target: [number, number]; deviation_pp: number }>;
+    max_deviation: number | null;
+  };
+  anti_pattern_hits: { total: number; by_pattern: Record<string, { count: number; note: string }> };
+  draft_to_final_diff: { change_percent?: number } | null;
+  pair_status: string | null;
+  summary: {
+    ratio_max_deviation_pp: number | null;
+    anti_pattern_total: number;
+    change_percent: number | null;
+  };
+  error?: string;
+};
+
+export const learningKeys = {
+  all: ["learning"] as const,
+  pairs: (status: string) => [...learningKeys.all, "pairs", status] as const,
+  distance: (caseNumber: string) => [...learningKeys.all, "distance", caseNumber] as const,
+};
+
+export function useReconciliationLedger(status = "") {
+  return useQuery({
+    queryKey: learningKeys.pairs(status),
+    queryFn: ({ signal }) =>
+      apiRequest<{ items: DraftFinalPair[]; count: number }>(
+        `/api/learning/pairs${status ? `?status=${status}` : ""}`,
+        { signal },
+      ),
+    staleTime: 15_000,
+  });
+}
+
+export function useStyleDistance(caseNumber: string | null) {
+  return useQuery({
+    queryKey: learningKeys.distance(caseNumber ?? ""),
+    queryFn: ({ signal }) =>
+      apiRequest<StyleDistance>(
+        `/api/learning/style-distance/${encodeURIComponent(caseNumber!)}`,
+        { signal },
+      ),
+    enabled: Boolean(caseNumber),
+    staleTime: 15_000,
+  });
+}