feat: /players browser + identity review queue UI

Phase 4. A Players page that browses the whole villain file (named + nameless,
expandable to episodic recall — reads, notable hands, stats, descriptors) and, at
the top, the identity-resolution queue: possible-merges (same/different/dismiss)
and needs-clarification tasks. Rename a nameless villain, set category, or run a
dupe scan inline.

- poker.players_overview() for the list.
- routes: /players (page), /players/data, /player/{id}/data, POST /player/{id}
  (rename/retag), POST /identity/{id}/resolve, POST /players/scan.
- nav: 👤 Players.

Full suite green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lyra/web/static/nav.js

@@ -8,6 +8,7 @@
     { href: "/session", icon: "♠",  label: "Session" },
     { href: "/history", icon: "📚", label: "History" },
     { href: "/hands",   icon: "🃏", label: "Hands" },
+    { href: "/players", icon: "👤", label: "Players" },
     { href: "/self",    icon: "🧠", label: "Mind" },
     { href: "/thoughts", icon: "💭", label: "Thoughts" },
     { href: "/journal", icon: "📔", label: "Journal" },