fix#14170fix#13893fix#13673fix#13543fix#13308fix#7607
#### PR Dependency Tree
* **PR #14247**
* **PR #14248** 👈
This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)
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-->
## Summary by CodeRabbit
* **New Features**
* Integrations panel in Account Settings to link/unlink calendar
providers.
* Collapsible settings wrapper for improved layout.
* **Improvements**
* Calendar system reworked: per-account calendar groups, simplified
toggles with explicit Save, richer event display (multi-dot date
indicators), improved event time/title handling across journal views.
* **Localization**
* Added calendar keys: save-error, no-journal, no-calendar; removed
legacy duplicate-error keys.
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settings.</sub>
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I'm a native Catalan and Spanish speaker.
There are lots of changes, if I notice something is off when using it,
I'll submit more patches to improve it.
One decision I'm not sure about is keeping "edgeless" as the
translation, since it's difficult to find a proper way of saying it
that's not too similar to "borderless" or "without borders" in Catalan.
I noticed Spanish has some of the strings as "Edgeless" and others "sin
bordes", so I'm guessing this is a bit subjective and in my opinion
leaving it unchanged is easier to understand than if poorly translated.
DarkSky