feat(ui): batch of UI polish tweaks

- admin dashboard "Users" count excludes robots (CountUsers, humans only)
- lobby finished-game delete reveal: background matches header/tab-bar (--bg-elev)
- mobile: swipe up on the zoom-out board (no staged tiles) shuffles the rack
- lobby: status icons -25%, game-row top/bottom padding halved
- toast: info tier drifts up ~a tab-bar height while fading over 2s and dismisses
  on tap; error tier unchanged
- game: confirm-move button stays pinned at the right edge; rack tiles shrink to
  fit so a full rack never overflows onto it
- telegram: a successful invite-link redeem shows a welcome window pointing at the bot
- settings: remove the grid-lines toggle; the board is always a gapless checkerboard
- settings/comms hubs: the selected tab highlight wraps icon + label as a pill

Docs: UI_DESIGN (toast, board surface, selected tab), PLAN; e2e updated for the
removed grid-lines toggle.

backend/internal/server/handlers_admin_console.go

@@ -110,7 +110,9 @@ func (s *Server) registerConsole(router *gin.Engine) {
 func (s *Server) consoleDashboard(c *gin.Context) {
 	ctx := c.Request.Context()
 	view := adminconsole.DashboardView{Variants: s.variantVersions(), ActiveVersion: s.games.ActiveVersion()}
-	view.Accounts, _ = s.accounts.CountAccounts(ctx)
+	// The Users card counts people only: robots are pool infrastructure, not registered
+	// users, so an empty filter (Robots: false) excludes them.
+	view.Accounts, _ = s.accounts.CountUsers(ctx, account.UserFilter{})
 	view.Games, _ = s.games.CountGames(ctx, "")
 	view.ActiveGames, _ = s.games.CountGames(ctx, game.StatusActive)
 	view.OpenComplaints, _ = s.games.CountComplaints(ctx, game.StatusComplaintOpen)