code_lens_reference_types

Summary

References should have a codelens button.
The button should be togleable in settings.
The button should the classification of the reference. e. g. ' open reqlan file', " open { extension } file', ' open folder', ' open idea'
Clicking the CodeLens should open a reference card with summary stats — not navigate, because references already act as editor links.
The card should offer open / reveal / file-selector actions when useful.
Folders should be handled by focusing on the ide explorer, or by opening a file selector.
Some summary stats should be shown for references - e. g. last edited, count of references, count of referencers, etc.
Implemented by reqlan-code-lens-provider.ts, reqlan-reference-code-lens.ts, reqlan-code-lens-settings.ts, register-reference-code-lens.ts, and reference-code-lens-card.ts.

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