[ahmedbektic]

PR Description

Add gui.sidePanelMaxWidth to limit the width of the left side section on wide terminals. The value is measured in terminal columns, including borders. The default of 0 disables the cap. When configured, the section uses the smaller of its existing proportional allocation and the maximum width. The cap applies in normal landscape mode. Portrait, enlarged, and full-screen layouts retain their existing behavior. Also fix zero-valued integer defaults in the configuration documentation generator so the generated example correctly displays sidePanelMaxWidth: 0.

references #6021

Please check if the PR fulfills these requirements

• Cheatsheets are up-to-date (run go generate ./...)
• Code has been formatted (see here)
• Tests have been added/updated (see here for the integration test guide)
• Text is internationalised (see here)
• If a new UserConfig entry was added, make sure it can be hot-reloaded (see here)
• Docs have been updated if necessary
• You've read through your own file changes for silly mistakes etc

[ahmedbektic]

I understand the policy regarding outside prs but would like to see something similar officially added upstream