Send the complete board when joining a room

board-shared/src/board.rs

@@ -134,6 +134,20 @@ impl Board {
         Self::is_aligned(positions, Alignment::Horizontal)
             || Self::is_aligned(positions, Alignment::Vertical)
     }
+
+    /// Gets a linear iterator over the tiles, row by row.
+    ///
+    /// # Example:
+    /// ```
+    /// use board_shared::board::Board;
+    ///
+    /// let board = Board::default();
+    /// let placed_tiles = board.iter().filter(Option::is_some).count();
+    /// assert_eq!(placed_tiles, 0);
+    /// ```
+    pub fn iter(&self) -> impl Iterator<Item = Option<Tile>> + '_ {
+        self.tiles.iter().copied()
+    }
 }
 
 impl Grid2d for Board {