[WIP] JasperReports 6.19.1→7.0.3

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original issue description:

Spike: Assess migration impact for JasperReports 7.0.3

Goal: Identify breaking changes from 6.19.1→7.0.3; list required code changes and risks.

Acceptance criteria:

• Document with checklist of impacted classes/methods
• Document build/toolchain needs
• Provide a migration plan
• Only accept if all existing tests pass 100%

Assignee: Copilot
Labels: enhancement

Parent issue: #114

Original prompt

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This section details on the original issue you should resolve

<issue_title>JasperReports 6.19.1→7.0.3</issue_title>
<issue_description>Spike: Assess migration impact for JasperReports 7.0.3

Goal: Identify breaking changes from 6.19.1→7.0.3; list required code changes and risks.

Acceptance criteria:

• Document with checklist of impacted classes/methods
• Document build/toolchain needs
• Provide a migration plan
• Only accept if all existing tests pass 100%

Assignee: Copilot
Labels: enhancement

Parent issue: #114</issue_description>

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

Fixes #115

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