Feature/3331 dynamic column width

[ludij]

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• Resolves: #3331 + #6457
• Target version: main

Summary

Following the descriptions in the linked ticket, I have updated the styles for the board, overview, stack and search results cards, so that they behave more responsive according to the space available. As a side-effect it also fixed issue #6457.

On top of that, this PR contains the following changes, which aren't necessarily part of the issue, but I thought they'd fit in:

• aligned design for board and overview
• aligned spacing inside stack between header, cards and new card form
• refactored how border radius is achieved on card image
• added v-for loop in overview to get rid of code duplication
• fixed border around add list
• used existingIndex to define existingCard to avoid extra lookup
• fixed binding of title attibute on stack column title for boards
• improved accessibility attributes on column for overview
• changed title phrasing of search results depending on view

new	old

TODO

N/A

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