feat(store): GOOD interop, rescan-merge, data staleness, lock detection

Task #5 building blocks, each a pure + unit-tested module:

- goodInterop.ts: GOOD (Genshin Optimizer / Inventory Kamera / Akasha) import and
  export for scanned StoredArtifactRecords - slot/stat/set key maps both ways,
  substat string <-> { key, value }, main-value reconstruction on import
  (ADR-003). Export is lossless; import is best-effort (GOOD lacks piece names).
- artifactMerge.ts: rescan-merge (ADR-006 follow-up). Level-independent identity
  (set + slot + main + substat NAME set) collapses leveled re-scan duplicates,
  keeping the higher-level/stronger record and summing timesSeen. Conservative:
  differing substat lineups never merge.
- dataPackageStatus.ts: warns when the genshin-db package is older than ~45 days
  (a patch cycle) so new sets/characters aren't silently missed; surfaced in the
  Scanner Diagnose data-package line. Adds dataGeneratedAt to genshinData.
- lockDetection.ts: EXPERIMENTAL read-only lock-status heuristic (gold-pixel
  ratio in a top-right icon crop). Pure + tested but not wired into capture; crop
  position and threshold need calibration against a reference 16:9 screenshot.

120 tests + build green. Remaining wiring (needs UI / live calibration): GOOD
import/export buttons and live lock detection.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/features/scan/components/modals/hooks/useScanDiagnosticsModalModel.ts

@@ -1,5 +1,6 @@
 import { detailFingerprint } from "../../../../../lib/autoScanLoop";
-import { sourceVersion } from "../../../../../lib/genshinData";
+import { dataGeneratedAt, sourceVersion } from "../../../../../lib/genshinData";
+import { dataPackageStatus } from "../../../../../lib/dataPackageStatus";
 import { useCallback, useMemo, type MouseEvent } from "react";
 import type { ScanDiagnosticsModalProps } from "../types";
 
@@ -96,7 +97,8 @@ export function useScanDiagnosticsModalModel({
     : "Run a capture once while the artifact inventory is visible.";
 
   const learningRulesText = controller.learningRulesLoaded ? `${controller.learningRuleCount} local rules` : "loading";
-  const learningRulesSubtext = `Review samples feed deterministic OCR fixes before each new parse. Data package: ${sourceVersion}`;
+  const dataStaleness = dataPackageStatus(dataGeneratedAt, sourceVersion);
+  const learningRulesSubtext = `Review samples feed deterministic OCR fixes before each new parse. Data package: ${sourceVersion}${dataStaleness.warning ? ` - ${dataStaleness.warning}` : ""}`;
 
   const playerProgress = useMemo(() => {
     const width = Math.min(