feat: add support for view mode in URL

[aparcar]

• Resolves: #
• Target version: main

Summary

This allows to link directly to a specific view by adding /gantt or /kanab to a board. It does not store the information, so the default user setting isn't touched.

This was generated using AI.

TODO

• Discuss if this approach makes sense or if parameters should be used instead.

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Documentation (manuals or wiki) has been updated or is not required

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