Fix \n in panel description fields not creating new lore lines

[Copilot]

Literal \n sequences in YAML panel description fields (e.g. background, border, or content items) were silently ignored as line separators. Only descriptions coming from translated locale keys worked reliably, since locale files produce actual newline characters. Plain-text descriptions written directly in the panel YAML had no way to span multiple lore lines.

Root cause

PanelItemBuilder.description(String) splits on \n (actual newline char). SnakeYAML only produces actual newlines from double-quoted strings — plain and single-quoted strings preserve \n as the two-character literal sequence \\n, which the split never matched.

Fix

• PanelItemBuilder.description(String) — normalise literal \\n → \n before splitting, making all three YAML string styles work:

# All of these now produce two lore lines:
description: "line 1\nline 2"    # double-quoted: always worked
description: 'line 1\nline 2'    # single-quoted: now fixed
description: line 1\nline 2      # plain:         now fixed
description: |                   # block scalar:  always worked
  line 1
  line 2

• PanelItemBuilderTest — adds testDescriptionStringWithActualNewline and testDescriptionStringWithLiteralBackslashN to cover both code paths.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Do not convert to a new line</issue_title>
<issue_description>### Expected behavior

when adding a description to the team panel and if you use \n, it should go to a new line.

Observed/Actual behavior

I see that where black glass is used, there is no normal description to add, but blue glass works fine
https://github.com/user-attachments/assets/4eacebfa-5db3-4c87-b922-0728e6365004

Steps/models to reproduce

1. we go this way: /home/container/plugins/BentoBox/panels/team_panel.yml
2. after that, we add a description of where the black glass is located, that is, in the background department
3. The description does not work

BentoBox version

BentoBox - 2.6.0
Minecraft version - 1.21.1

Plugin list

No response

Other

https://github.com/user-attachments/assets/f8520987-2db5-4f6f-9be1-7159688544d1
https://github.com/user-attachments/assets/5d66de41-1426-4037-8c65-12fa87cc69e0

the same problem with team_invite_panel.yml
</issue_description>

Comments on the Issue (you are @copilot in this section)

@tastybento With YAML, the way to do new lines is like this usually. Does this work?

description: |
  This is line 1
  This is line 2
  This is line 3

• Fixes Do not convert to a new line #2533

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

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