Integrate name suggestions into encounter registration UI

Add clickable suggestion chips below the nickname input in the encounter
modal. Chips are fetched from GET /runs/{id}/name-suggestions via React
Query, shown only when a naming scheme is set. Clicking a chip fills in
the nickname; a regenerate button fetches a fresh random batch. Completes
the Name Generation epic.

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

frontend/src/pages/RunEncounters.tsx

@@ -1431,6 +1431,8 @@ export function RunEncounters() {
         <EncounterModal
           route={selectedRoute}
           gameId={run!.gameId}
+          runId={runIdNum}
+          namingScheme={run!.namingScheme}
           existing={editingEncounter ?? undefined}
           dupedPokemonIds={dupedPokemonIds}
           retiredPokemonIds={retiredPokemonIds}