Suppress global hotkeys while a text field is focused

The save-dialog name field is a focused TMP_InputField, but global discrete
hotkeys kept reading the keyboard every frame, so typing a name like
"Checkers" cycled the pose (C) and shut the server down (K). Add a shared
TypingGuard.IsTyping check (focused TMP/legacy InputField) and short-circuit
the global handlers on it: pose cycle, network dev keys, mode switch, and
paint undo/redo. Movement was already gated out via ControlEnabled.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Assets/Scripts/NetworkBootstrap.cs

@@ -38,6 +38,7 @@ public class NetworkBootstrap : MonoBehaviour
     private void Update()
     {
         if (!enableHotkeys) return;
+        if (TypingGuard.IsTyping) return; // don't fire H/C/J/K while typing in a text field
 #if ENABLE_INPUT_SYSTEM
         var kb = Keyboard.current;
         if (kb == null || _net == null) return;