Niklas Halle

Summarize "metadata" in search too (as is done for tags)

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### Support guidelines - [X] I've read the [support guidelines](https://github.com/firefly-iii/firefly-iii/blob/main/.github/support.md) - [X] My request is not listed as [a very good idea, but unfortunately...](https://docs.firefly-iii.org/firefly-iii/about-firefly-iii/what-its-not/) - [X] I've used [the search](https://github.com/firefly-iii/firefly-iii/issues?q=is%3Aissue)...

Ability to filter categories in search

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### Support guidelines - [X] I've read the [support guidelines](https://github.com/firefly-iii/firefly-iii/blob/main/.github/support.md) - [X] My request is not listed as [a very good idea, but unfortunately...](https://docs.firefly-iii.org/firefly-iii/about-firefly-iii/what-its-not/) - [X] I've used [the search](https://github.com/firefly-iii/firefly-iii/issues?q=is%3Aissue)...

Ability to copy values from on field to another using rules

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**Description** Hello, I would like Firefly III rules to be able to copy values from one field to another. E.g., when I set a new description for a transaction imported,...

Last update date for piggy banks overview

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### Support guidelines - [X] I've read the [support guidelines](https://github.com/firefly-iii/firefly-iii/blob/main/.github/support.md) - [X] My request is not listed as [a very good idea, but unfortunately...](https://docs.firefly-iii.org/firefly-iii/more-information/what-its-not/) - [X] I've used [the search](https://github.com/firefly-iii/firefly-iii/issues?q=is%3Aissue)...

## What this PR does / why we need it: Implements diacritic-insensitive search across the application. Searches now match text regardless of diacritics (e.g., "Käse" matches "kase" and vice versa)....