Fix S&P 500 universe parse so renames like BNY are discovered.

Wikipedia no longer uses plain symbol table cells; parse exchange links and NyseSymbol templates, surface the list source in bootstrap results, and keep legacy cell parsing as a fallback.

frontend/src/hooks/useAdmin.ts

@@ -274,7 +274,10 @@ export function useBootstrapTickers() {
       qc.invalidateQueries({ queryKey: ['admin', 'ticker-universe'] });
       addToast(
         'success',
-        `Bootstrap done: +${result.added}, existing ${result.already_tracked}, deleted ${result.deleted}`,
+        `Bootstrap done (${result.source ?? 'unknown'}): +${result.added}, existing ${result.already_tracked}, deleted ${result.deleted}`
+        + (result.added_symbols?.length
+          ? ` · added ${result.added_symbols.slice(0, 8).join(', ')}${result.added > 8 ? '…' : ''}`
+          : ''),
       );
     },
     onError: (error: Error) => {

frontend/src/lib/types.ts

@@ -718,10 +718,14 @@ export interface TickerUniverseSetting {
 
 export interface TickerUniverseBootstrapResult {
   universe: TickerUniverse;
+  /** Where the member list came from: wikipedia_sp500 | fmp | cache | seed | … */
+  source?: string;
   total_universe_symbols: number;
   added: number;
   already_tracked: number;
   deleted: number;
+  /** Sample of newly added symbols (capped server-side). */
+  added_symbols?: string[];
 }
 
 export interface PipelineReadiness {