Stage 17 round 5 docs: bake the bug fixes + UI polish + L2 into live docs

- ARCHITECTURE: resign on the opponent's turn (ResignSeat + turn-check bypass); robots
  block chat but accept-and-ignore friend requests; quick-match /lobby/cancel; the admin
  robot play-to-win intent + next-move ETA panel.
- UI_DESIGN: even A->B zoom (recentre only on zoom-in), pinch, drop-target highlight,
  shuffle ≤0.3s + reduce-motion, borderless make-move disabled on illegal, variant title.
- FUNCTIONAL (+ru): variant display names (Scrabble/Erudite); robot ignores friend requests.
- PLAN: round-5 refinements bullet (+ the bilingual two-Scrabble open edge).

docs/FUNCTIONAL.md

@@ -55,9 +55,11 @@ two accounts share a game still in progress.
 
 ### Lobby & matchmaking *(Stage 4 / 15)*
 Bottom tab menu: **my games**, **profile**. The game types offered on **New Game** are
-limited to the languages the player's sign-in service supports (English → English;
-Russian → Russian + Эрудит; a bilingual service shows all three, and the web client is
-unrestricted). This gates only **starting** a new game — both auto-match and a friend
+limited to the languages the player's sign-in service supports (English → Scrabble;
+Russian → Scrabble + Erudite; a bilingual service shows all three, and the web client is
+unrestricted). Variants are shown by their **display name** — both Scrabble variants read
+"Scrabble"/"Скрэббл" and Erudit reads "Erudite"/"Эрудит" (by the interface language), and
+the same name titles the in-game screen. This gates only **starting** a new game — both auto-match and a friend
 invitation — so a player still sees and plays existing games of any language. Auto-match
 (always 2 players) joins a per-variant pool and is paired with the next waiting human;
 after 10 s with no human the robot substitutes (the robot arrives in Stage 5). Friend games (2–4) are
@@ -92,7 +94,8 @@ and plays at a human pace — short thinking times for most moves, the occasiona
 one, and a night-time pause that tracks the player's own day. It answers a nudge
 within a few minutes and nudges back when the player has been away a long time. It
 carries a human-like, language-appropriate name (a Russian game draws mostly Russian
-names) and neither chats nor accepts friend requests.
+names); it does not chat, and **silently ignores friend requests** — a request to a
+robot stays pending and expires, exactly like a human who never responds.
 
 ### Social: friends, block, chat, nudge *(Stage 4 / 8)*
 Become friends in two ways: redeem a **one-time code** the other player issues (six