* Expose tag parent and depth for hierarchy view
* Accessibility: add visual tag properties panel
* Show collapsible tag hierarchy in accessibility panel
* Open checker findings in the matching structure tag
* Translate Tags panel across supported languages
* Tags panel: walk the structure tree once per edit, not every frame
The Tags panel and checker findings that open a tag share a tag list cached per
document and edit generation.
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Co-authored-by: Brandon Thomas <echelon@gmail.com>