feat(tradein/v2): wire AnalyticsView + SourcesView overlays to real API data (#2040, #2041)

Audit of /trade-in/v2 found the FE-3/FE-4 overlay wiring (mapAnalytics/mapSources
feeding AnalyticsView/SourcesView from useEstimateHouseAnalytics,
useEstimateSellTimeSensitivity, analogs[]/actual_deals[]) already shipped in
267585e3. The remaining gap was BE-1 (#2043, merged 2026-07-02) landing real
cv/source_counts/created_at on AggregatedEstimate AFTER that wiring pass, so
v2/mappers.ts was still FE-approximating cv and duplicating a hardcoded source
label map instead of the single source-registry (#2211).

- mapSources' marketAds.kpi.cv (#2041) now prefers the real estimate.cv
  (0..1 ratio from BE-1) and only falls back to the FE coefficient-of-variation
  of analog prices for pre-#2043 cached estimates where cv is absent.
- adRows/dealRows source badges (#2041) now resolve via the shared
  src/lib/source-registry sourceLabel() instead of a local SOURCE_LABEL map,
  picking up etagi/canonical labels and staying in sync with the #2211 roster.
- AnalyticsView (#2040) KPIs/sell-time/price-history/scatterDetail were already
  wired to real data with no gaps found against the issue spec.

tradein-mvp/frontend/src/components/trade-in/v2/mappers.ts

@@ -8,10 +8,13 @@
 // renders. ALL money/format/geometry lives here — never copy fixture literals.
 //
 // Reconciliations / known FE-approximations (look for "TODO BE-N"):
-//   BE-1  created_at, cv, per-source lot counts are NOT in the API response.
-//         Report date is derived as expires_at − 24h; cv is the FE coefficient
-//         of variation of analog ₽/м²; source counts are an FE groupBy of
-//         analogs + actual_deals by .source.
+//   BE-1  #2043 shipped 2026-07-02: AggregatedEstimate now carries real
+//         cv/source_counts/created_at. mapSources' marketAds.kpi.cv (#2041)
+//         prefers estimate.cv and only falls back to the FE coefficient of
+//         variation (analog ₽/м²) for pre-#2043 cached estimates where cv is
+//         absent. mapReport/mapResultPanel/mapSummary/mapCache still use the
+//         pre-BE-1 approximations (created_at shift, FE source groupBy) — out
+//         of scope for #2040/#2041, left as-is.
 //   BE-2  target_address is a single string; street/city are split heuristically
 //         (parseAddress). Backend should return structured address components.
 //   BE-3  location coefficient / street-view caption / compass bearing are not in
@@ -67,6 +70,7 @@ import type {
   SummaryRow,
 } from "./types";
 import { tokens } from "./tokens";
+import { sourceLabel as registrySourceLabel } from "@/lib/source-registry";
 
 // Total number of source slots — meta "N / M". Single source of truth is
 // SOURCE_SLOTS.length (defined with the array below as TOTAL_SOURCES).
@@ -268,6 +272,26 @@ function cvStr(values: number[]): string {
     : "—";
 }
 
+/** Format a 0..1 coefficient-of-variation ratio the same way as cvStr's %. */
+function cvRatioStr(cv: number): string {
+  return `${(cv * 100).toLocaleString("ru-RU", {
+    minimumFractionDigits: 1,
+    maximumFractionDigits: 1,
+  })}%`;
+}
+
+/**
+ * Analog ₽/м² spread, used by #2041's marketAds.kpi.cv. Prefers the real
+ * backend estimate.cv (#2043/BE-1, 0..1 ratio) and only falls back to the FE
+ * coefficient of variation for pre-#2043 cached estimates where cv is absent
+ * (older persisted rows don't carry it — see the file-header TODO BE-1 note).
+ */
+function cvLabel(e: AggregatedEstimate | null): string {
+  if (e == null) return "—";
+  if (e.cv != null && Number.isFinite(e.cv)) return cvRatioStr(e.cv);
+  return cvStr(e.analogs.map((a) => a.price_per_m2));
+}
+
 /**
  * Bin `values` into 8 buckets across [min,max]; return per-bucket height as
  * count/maxCount*100 (the mini-histogram bar heights). Empty input -> [].
@@ -1107,22 +1131,13 @@ function fmtDist(m: number | null | undefined): string {
   })}${NBSP}км`;
 }
 
-// Source key -> brand/RU display label (badges + link source).
-const SOURCE_LABEL: Record<string, string> = {
-  avito: "Avito",
-  avito_imv: "Avito",
-  cian: "Циан",
-  yandex: "Яндекс",
-  rosreestr: "Росреестр",
-  domklik: "Домклик",
-  domclick: "Домклик",
-  restate: "Restate",
-  // n1 полностью выключен (#2204) → истор. строки source='n1' идут через fallback `?? s`.
-};
-
+// Source key -> brand/RU display label (badges + link source). Delegates to the
+// single source-registry roster (#2211) instead of a local hardcoded map — an
+// unknown/inactive id (e.g. historical 'n1' rows, #2204) echoes back verbatim
+// via the registry's own fallback rather than inventing a label.
 function sourceLabel(s: string | null | undefined): string {
   if (!s) return "—";
-  return SOURCE_LABEL[s.toLowerCase()] ?? s;
+  return registrySourceLabel(s.toLowerCase());
 }
 
 /** Rosreestr deal tier -> RU caption next to the badge. */
@@ -1762,7 +1777,7 @@ export function mapSources(
           ? numRu(e.median_price_per_m2)
           : "—",
       range: e != null ? mlnRangeTight(e.range_low_rub, e.range_high_rub) : "—",
-      cv: e != null ? cvStr(e.analogs.map((a) => a.price_per_m2)) : "—",
+      cv: cvLabel(e),
     },
     filters: buildAdFilters(e),
   };