Mouse passthrough - mouse and keyboard handling

**Describe the bug**
no keyboard and mouse handle if passthrough

**To Reproduce**
Steps to reproduce the behavior:
send viewport command mouse passthrough and passthrough

**Expected behavior**
handling keyboard and mouse if mouse passthrough

**Desktop (please complete the following information):**
- OS: windos 11
- Browser librewolf
- Version latest

**Additional context**
how handle globally?

Start by reproducing the issue on Windows 11 using the viewport mouse-passthrough command described in the report. Trace how viewport passthrough affects keyboard and mouse handling, then verify that both remain available when passthrough is enabled. Done means the reported interaction works consistently and the behavior is covered by an appropriate regression check.

Written by the indexing model from the issue text.