README tour gains the game detail page

Eric flagged the detail pages as worth showing. Britannia's page joins
BGG's stats with the pipeline's own knowledge — the owned edition and
the shelf photo provenance — which is the pitch in one image.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016jXZFSTZQKzAC8fqpWSz9g

README.md

@@ -54,6 +54,10 @@ Every stage is idempotent and resumable: kill it mid-run, restart, lose nothing.
 
 ![Library page filled with 136 games as art cards — search, kind filters, player-count filter and sort controls above; RPG entries carry local-only chips](docs/screenshots/06.png)
 
+**A game's detail page** — BGG's stats, chips, and description joined with what only the pipeline knows: *your* edition, and the shelf photo it was read from.
+
+![Game detail page for Britannia: box art beside player counts, playing time, weight, rank, designers and mechanics as chips, with a Your Edition card naming the owned printing](docs/screenshots/10-game-detail.png)
+
 **Help** — the whole flow, every page, every status, and every keyboard shortcut, documented in-app.
 
 ![Help page documenting the shelves-to-collection flow, what each page is for, and the proofreading and review checkpoints](docs/screenshots/07.png)