Implement fiscal-style research MVP flows

lib/query/keys.ts

@@ -14,6 +14,7 @@ export const queryKeys = {
   filings: (ticker: string | null, limit: number) => ['filings', ticker ?? '', limit] as const,
   report: (accessionNumber: string) => ['report', accessionNumber] as const,
   watchlist: () => ['watchlist'] as const,
+  researchJournal: (ticker: string) => ['research', 'journal', ticker] as const,
   holdings: () => ['portfolio', 'holdings'] as const,
   portfolioSummary: () => ['portfolio', 'summary'] as const,
   latestPortfolioInsight: () => ['portfolio', 'insights', 'latest'] as const,