Fix: remove invalid set_terminal_size_handler call

asyncssh SSHServerProcess doesn't have that method. Simplified
input handling - now updates size on each keypress instead.

src/shellmate/ssh/server.py

@@ -92,9 +92,6 @@ async def handle_client(process: asyncssh.SSHServerProcess) -> None:
     # Create terminal session
     session = TerminalSession(process)
     
-    # Set up resize handler
-    process.channel.set_terminal_size_handler(session.handle_resize)
-    
     term_type = process.get_terminal_type() or "xterm-256color"
     logger.info(f"Client {username}: term={term_type}, size={session.width}x{session.height}")
     
@@ -195,32 +192,18 @@ async def run_simple_menu(process, session: TerminalSession, username: str, mode
     
     render_menu()
     
-    # Wait for input with resize handling
+    # Wait for input
     while True:
         try:
-            # Use asyncio.wait with timeout to check for resize
+            data = await process.stdin.read(1)
-            read_task = asyncio.create_task(process.stdin.read(1))
-            
-            done, pending = await asyncio.wait(
-                [read_task],
-                timeout=0.5,
-                return_when=asyncio.FIRST_COMPLETED
-            )
-            
-            # Check if resize happened
-            if session._resize_event.is_set():
-                render_menu()
-                continue
-            
-            if not done:
-                continue
-                
-            data = read_task.result()
             if not data:
                 break
             
             char = data.decode() if isinstance(data, bytes) else data
             
+            # Update terminal size in case it changed
+            session._update_size()
+            
             if char in ('q', 'Q', '\x03', '\x04'):  # q, Ctrl+C, Ctrl+D
                 session.clear()
                 session.write("\r\n\033[33mGoodbye! Thanks for playing!\033[0m\r\n\r\n")
@@ -376,29 +359,15 @@ async def run_chess_game(process, session: TerminalSession, username: str, oppon
     
     while not board.is_game_over():
         try:
-            read_task = asyncio.create_task(process.stdin.read(1))
+            data = await process.stdin.read(1)
-            
-            done, pending = await asyncio.wait(
-                [read_task],
-                timeout=0.5,
-                return_when=asyncio.FIRST_COMPLETED
-            )
-            
-            # Handle resize
-            if session._resize_event.is_set():
-                render_board()
-                session.write(move_buffer)
-                continue
-            
-            if not done:
-                continue
-                
-            data = read_task.result()
             if not data:
                 break
             
             char = data.decode() if isinstance(data, bytes) else data
             
+            # Update terminal size in case it changed
+            session._update_size()
+            
             if char in ('\x03', '\x04'):  # Ctrl+C/D
                 break
             elif char in ('q', 'r'):