Simplify chess board rendering - plain text that works over SSH

- Remove complex Rich styling from board (caused rendering issues)
- Use simple ASCII box drawing (+---+) instead of Unicode box chars
- Use dots for dark squares, spaces for light
- Plain text status display
- Much more reliable over SSH terminals

src/shellmate/ssh/server.py

@@ -272,88 +272,66 @@ async def run_chess_game(process, session: TerminalSession, username: str, oppon
     
     def render_board():
         nonlocal status_msg
-        writer = ProcessWriter(session)
-        console = Console(file=writer, width=session.width, height=session.height, force_terminal=True)
-        
         session.clear()
         
-        # Calculate centering
-        board_width = 42
-        left_pad = max(0, (session.width - board_width) // 2)
-        pad = " " * left_pad
-        
-        # Title
-        console.print()
-        console.print(Align.center(Text("♔ SHELLMATE CHESS ♔", style="bold cyan")))
-        console.print()
-        
-        # Board with better colors
-        console.print(f"{pad}    a   b   c   d   e   f   g   h")
-        console.print(f"{pad}  ┌───┬───┬───┬───┬───┬───┬───┬───┐")
+        # Simple text-based board that works reliably over SSH
+        lines = []
+        lines.append("")
+        lines.append("        ♔ SHELLMATE CHESS ♔")
+        lines.append("")
+        lines.append("      a   b   c   d   e   f   g   h")
+        lines.append("    +---+---+---+---+---+---+---+---+")
         
         for rank in range(7, -1, -1):
-            row = f"{pad}{rank + 1} │"
+            row = f"  {rank + 1} |"
             for file in range(8):
                 square = chess.square(file, rank)
                 piece = board.piece_at(square)
                 
-                is_light = (rank + file) % 2 == 1
-                # Green theme for board
-                if is_light:
-                    bg = "on #769656"  # Light green
-                else:
-                    bg = "on #4a7c3f"  # Dark green
-                
                 if piece:
                     char = PIECES.get(piece.symbol(), '?')
-                    # White pieces in white/cream, black pieces in dark
-                    if piece.color == chess.WHITE:
-                        fg = "#ffffff bold"
+                    row += f" {char} |"
                 else:
-                        fg = "#1a1a1a bold"
-                    row += f"[{fg} {bg}] {char} [/]│"
-                else:
-                    row += f"[{bg}]   [/]│"
+                    # Use dots for dark squares, spaces for light
+                    is_light = (rank + file) % 2 == 1
+                    row += " . |" if not is_light else "   |"
             
             row += f" {rank + 1}"
-            console.print(row)
+            lines.append(row)
+            lines.append("    +---+---+---+---+---+---+---+---+")
         
-            if rank > 0:
-                console.print(f"{pad}  ├───┼───┼───┼───┼───┼───┼───┼───┤")
+        lines.append("      a   b   c   d   e   f   g   h")
+        lines.append("")
         
-        console.print(f"{pad}  └───┴───┴───┴───┴───┴───┴───┴───┘")
-        console.print(f"{pad}    a   b   c   d   e   f   g   h")
-        console.print()
+        # Center the board
+        board_width = 42
+        left_pad = max(0, (session.width - board_width) // 2)
+        pad = " " * left_pad
         
-        # Status panel
+        for line in lines:
+            session.write(pad + line + "\r\n")
+        
+        # Use Rich only for the status panel (simpler)
+        
+        # Simple status display
         turn = "White ♔" if board.turn == chess.WHITE else "Black ♚"
-        turn_style = "bold white" if board.turn == chess.WHITE else "bold"
-        
-        status_lines = []
-        status_lines.append(f"[{turn_style}]{turn} to move[/]")
+        session.write(pad + f"  {turn} to move\r\n")
         
         if board.is_check():
-            status_lines.append("[red bold]⚠️  CHECK![/red bold]")
+            session.write(pad + "  *** CHECK! ***\r\n")
         
         if move_history:
             last_moves = move_history[-3:]
-            status_lines.append(f"[dim]Moves: {' '.join(last_moves)}[/dim]")
+            session.write(pad + f"  Moves: {' '.join(last_moves)}\r\n")
         
         if status_msg:
-            status_lines.append(f"[yellow]{status_msg}[/yellow]")
+            session.write(pad + f"  {status_msg}\r\n")
             status_msg = ""
         
-        status_lines.append("")
-        status_lines.append("[dim]Enter move (e.g. e2e4) │ [q]uit │ [r]esign[/dim]")
-        
-        status_panel = Panel(
-            "\n".join(status_lines),
-            box=ROUNDED,
-            border_style="blue",
-            width=min(50, session.width - 4),
-            title="[bold]Game Status[/bold]"
-        )
-        console.print(Align.center(status_panel))
+        session.write("\r\n")
+        session.write(pad + "  Enter move (e.g. e2e4) | [q]uit | [r]esign\r\n")
+        session.write(pad + "  Move: ")
+        session.show_cursor()
         
         # Show cursor for input
         session.show_cursor()

tests/test_ui_render.py

@@ -92,36 +92,34 @@ def test_game_status_render():
 def test_chess_board_render():
     """Test that chess board renders without errors."""
     output = StringIO()
-    console = Console(file=output, width=80, height=24, force_terminal=True, color_system="truecolor")
     
     PIECES = {
         'K': '♔', 'Q': '♕', 'R': '♖', 'B': '♗', 'N': '♘', 'P': '♙',
         'k': '♚', 'q': '♛', 'r': '♜', 'b': '♝', 'n': '♞', 'p': '♟',
     }
     
-    # Render a simple board section
-    console.print("    a   b   c   d   e   f   g   h")
-    console.print("  ┌───┬───┬───┬───┬───┬───┬───┬───┐")
+    # Simplified board rendering (plain text)
+    lines = []
+    lines.append("      a   b   c   d   e   f   g   h")
+    lines.append("    +---+---+---+---+---+---+---+---+")
     
-    # Render one rank with colored squares
-    row = "8 │"
-    for file in range(8):
-        is_light = (7 + file) % 2 == 1
-        if is_light:
-            bg = "on #769656"
-        else:
-            bg = "on #4a7c3f"
-        
-        # Starting position pieces
+    # Render rank 8 with pieces
     pieces_row = ['r', 'n', 'b', 'q', 'k', 'b', 'n', 'r']
-        char = PIECES.get(pieces_row[file], ' ')
-        row += f"[#1a1a1a bold {bg}] {char} [/]│"
-    
+    row = "  8 |"
+    for file, piece_char in enumerate(pieces_row):
+        char = PIECES.get(piece_char, '?')
+        row += f" {char} |"
     row += " 8"
-    console.print(row)
+    lines.append(row)
+    lines.append("    +---+---+---+---+---+---+---+---+")
+    
+    for line in lines:
+        output.write(line + "\n")
     
     rendered = output.getvalue()
     assert "a   b   c" in rendered
+    assert "♜" in rendered  # Black rook
+    assert "+---+" in rendered
 
 
 def test_narrow_terminal_render():