[BUG] contentMaxWidth not working with horozintal/vertical layouts

[adamantike]

Environment

Self-Hosted (Docker)

System

No response

Version

4.0.8

Describe the problem

The contentMaxWidth config value sets --content-max-width inline, but both horizontal and vertical layouts also set this same variable in Home.vue, so the inline value is never taken into account.

Small appConfig that reproduces the issue:

appConfig:
  layout: vertical # or horizontal
  contentMaxWidth: 98%

Additional info

No response

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