[MOD-168] Chunk border keybind for 1.8.9

[Wyvest]

just port

https://modrinth.com/mod/legacy-chunk-borders-forge

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Originally reported by Wyvest, imported from: Chunk border keybind for 1.8.9

• status: Backlog
• priority: Low
• resolution: Unresolved
• imported: 2025-06-25

[Wyvest]

Subtask of parent task MOD-85

[Wyvest]

[Epic: REDACTION]