* Fix backward compatibility for old-style JSON config imports
* Refactor sidebar UI generation and add tests for Get-WinUtilVariables
* Fix appnavigation config test following UI generation refactor
* Restore global sync state in variables tests
* fix(impex): migrate supported legacy selections
Keep modern imports strict while allowing legacy backups to skip retired entries with clear logging and user feedback. Add fixtures covering partial and all-retired imports.
* test: strengthen UI and global state coverage
Exercise app category rendering through Initialize-WPFUI and restore global sync without leaking test state.
* fix(impex): ignore legacy metadata fields
Limit legacy selection migration to supported WPF key families so unrelated string metadata does not produce false retired-setting warnings.
* docs: clarify legacy config imports
Distinguish strict modern flat imports from partial legacy object migration, including single-setting export shape and historical groups.
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Co-authored-by: Chris Titus <contact@christitus.com>
Tabs other than Install build their checkboxes lazily on first visit.
Import populates $sync.selected* and calls Reset-WPFCheckBoxes, but
that only touches checkboxes that already exist in $sync, so any tab
not yet visited gets its controls built later with default (unchecked)
state and never reflects the import. Re-apply Reset-WPFCheckBoxes right
after a tab's controls are built so it picks up existing selections.
