feat(stats): wire totalStories stat tile in reader dashboard

Manually adds totalStories to generated StatsDTO type and wires it from
readerStats into ReaderStatsStrip — resolves @Elicit: stories tile was
permanently showing "—".

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/lib/generated/api.ts

@@ -2125,6 +2125,8 @@ export interface components {
             totalPersons?: number;
             /** Format: int64 */
             totalDocuments?: number;
+            /** Format: int64 */
+            totalStories: number;
         };
         PersonSummaryDTO: {
             title?: string;