Allow rotating single attribute text

[Taron686]

Summary

• allow specifying attribute entries as a text/angle pair so single attributes can be rotated
• normalize attribute handling to keep rotations with other attribute values and set the correct SVG text properties
• add a regression test to cover rotated attribute rendering

Testing

• pytest

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https://chatgpt.com/codex/tasks/task_e_68d6ed644468832086a01de767200666