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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