Stage 17 docs: round-4 UI (inline profile, double-tap/drag recall, hover-zoom, animated shuffle, lines-off board)

- UI_DESIGN: double-tap recall vs zoom, hover-hold drag auto-zoom, placing & recall
  rules, grid-lines toggle (gapless checkerboard default), animated shuffle; fix the
  stale MakeMove/Reset description (direct ✅ button + ↩️ Reset tab, no popover).
- FUNCTIONAL (+ru): optional trailing '.' in display names; profile edited inline.
- PLAN: robot early band [1,5]→[3,10] (#14); round-4 refinements + deferred #2/#16.

docs/FUNCTIONAL.md

@@ -109,9 +109,10 @@ even disguised. Nudge the player whose turn is awaited at most once per hour (th
 nudge is part of the game chat); the out-of-app push is delivered via the platform.
 
 ### Profile & settings *(Stage 4 / 8)*
-Edit the display name (letters joined by single space / "." / "_" separators, up to
-32 characters), the timezone (chosen as a UTC offset), the daily away window (on a
-10-minute grid, at most 12 hours, wrapping midnight) and the block toggles. Linking
+Edit the display name (letters joined by a single space / "." / "_" separator, with an
+optional trailing ".", up to 32 characters), the timezone (chosen as a UTC offset), the
+daily away window (on a 10-minute grid, at most 12 hours, wrapping midnight) and the
+block toggles. The profile form is edited inline (no separate edit mode). Linking
 an email or Telegram and merging accounts are covered under "Accounts, linking &
 merge" (Stage 11).