Preferences: a panel of what the browser remembers about its player, with the kit's motion and confirm-move settings, a game's own declarations, and the host's last table options as defaults

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Jm2auWk6RP71CjaAb4FMoG

CONVENTIONS.md

@@ -64,6 +64,13 @@ README.
   where the keeper roosts. It lives in the about panel; the colophons, the
   rules page and the guide each carry a one-line mail link.
 
+- **Preferences** are what a browser remembers about its player: a panel
+  opened from *preferences* in the hall and the masthead, kept in
+  localStorage and nowhere else. The kit's own settings are motion (full or
+  reduced, and the system's reduced-motion request counts too) and
+  confirming a move before it is sent; a game declares more in
+  `GameSpec.preferences` and the panel renders them. The hall also
+  remembers the host's last table options as the next table's defaults.
 - **The tally** sits in the about panel: what the ledgers add up to
   (tables, games begun and finished, names seated, turns, time at the
   table, games with a bot, talk), counted on demand from the files and