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/UI_DESIGN.md

@@ -63,16 +63,22 @@ Login uses `Screen`.
   differently in Safari/Chrome). Labels are sized in `cqw` against the fixed viewport, so
   they stay a constant size as the cells grow (relatively smaller at higher zoom).
   **Double-tap** an empty/filled cell toggles zoom centred on it; double-tap a **pending**
-  tile recalls it. On touch, placing a tile auto-zooms in centred on the target, and
-  **holding a dragged tile over a cell for ~1 s** auto-zooms there (Stage 17). The custom
-  pinch and swipe-to-open-history gestures stay dropped — they fight both native scroll and
-  the one-finger drag-back gesture; history opens from the menu or a tap on the players
-  plaque (below). A **hint** auto-zooms centred on the hint's placement, not the top-left.
+  tile recalls it. **Pinch** zooms toward the pinch midpoint (a two-finger gesture;
+  preventDefault fires only for two touches, so one-finger scroll stays native, and a second
+  finger aborts an in-progress drag). The pan is **interpolated toward a pre-clamped target**
+  as the real width grows/shrinks, so it magnifies evenly A→B instead of lurching and snapping
+  back near the edges (Stage 17). It **recentres only on a zoom-in** — placing a 2nd+ tile or
+  hovering a dragged tile never jumps the board. On touch the first tile placement auto-zooms
+  in centred on the target, and **holding a dragged tile over a cell ~1 s** auto-zooms there
+  the first time. The swipe-to-open-history gesture stays dropped (it fought native scroll);
+  history opens from the menu or a tap on the players plaque (below). A **hint** auto-zooms
+  centred on the hint's placement, not the top-left.
 - **Placing & recall** (`Game.svelte`): a rack tile is placed by tap-then-tap or by
-  dragging it onto a cell; a pending tile is taken back by a **double-tap** or by **dragging
-  it back onto the rack** (unzoomed board only — when zoomed the one-finger gesture scrolls).
-  A single tap no longer recalls (too easy to trigger); a recalled tile returns to its
-  original rack slot (Stage 17).
+  dragging it onto a cell; while a dragged tile is carried over the board, the aimed-at empty
+  cell is **highlighted as a drop target** (an accent ring). A pending tile is taken back by a
+  **double-tap** or by **dragging it back onto the rack** (unzoomed board only — when zoomed
+  the one-finger gesture scrolls). A single tap no longer recalls (too easy to trigger); a
+  recalled tile returns to its original rack slot (Stage 17).
 - **Players plaque & history** (`Game.svelte`, Stage 17): the seats above the board share
   the width evenly; the seat whose turn it is is **raised** (a drop shadow on its sides)
   while the others read **sunk in** (an inset shadow). A tap anywhere on the plaque toggles
@@ -105,12 +111,15 @@ Login uses `Screen`.
   short tap opens a small popover above the button; a ~0.7 s hold runs the primary action
   immediately. Used by the **Skip** and **Hint** tabs (each confirmed by an **Ok ✅** popover).
 - **MakeMove / Reset** (Stage 17): when ≥1 tile is pending the rack collapses its used slots
-  and shifts left, a direct **✅** button beside the rack commits the move (no popover), and
-  the 🔀 Shuffle tab is replaced by a **↩️ Reset** tab.
+  and shifts left, a **borderless ✅ icon button** (styled like a tab, not a filled accent
+  button) beside the rack commits the move — no popover, and disabled while the pending word
+  is known illegal; the 🔀 Shuffle tab is replaced by a **↩️ Reset** tab.
 - **Game tab bar**: 🔄 Draw (disabled when the bag is empty), 🥺 Skip, 🛟 Hint (with a
   remaining-count badge, disabled at zero); 🔀 Shuffle (no label, no confirm), which
   **animates** — tiles hop along a low parabola to their new slots (duration scaled by the
-  distance) with a short haptic shake. The under-board slot shows the **Scores: N** preview.
+  distance, the longest ≤ 0.3 s; off under reduce-motion) with a short haptic shake. The
+  under-board slot shows the **Scores: N** preview. The screen **title** is the variant's
+  display name (Scrabble / Скрэббл / Erudite / Эрудит), not a constant "Scrabble".
 
 ## Announcement banner (`components/AdBanner.svelte`, `lib/banner.ts`)