## Summary
After #5292, at certain browser zoom levels, the xterm terminal did not
fill horizontal space properly, showing a gap with mismatched background
colors (`#171717` viewport vs `black` terminal content).
Fixes https://github.com/Comfy-Org/ComfyUI_frontend/issues/6049
## Problem
The hardcoded `#171717` terminal theme background only affected the
xterm viewport, while terminal content remained black, causing a visible
color mismatch at low zoom levels where the gap was more apparent.
Fixed by keeping original theme when not on desktop distribution.
┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6056-fix-terminal-style-28c6d73d36508132b521e5767f41d540)
by [Unito](https://www.unito.io)
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