- Add a top-level "Import" entry to the sidebar and a global /import page, so
you can start a tree from a GEDCOM without first creating an empty one. The
import flow now picks its destination (new tree, or an existing one) — the
tree-scoped page reuses the same <GedcomImport> with a fixed destination and
keeps Export.
- Extract the sidebar chrome into <AppShell> and give small screens a working
menu: a hamburger opens the full sidebar as a slide-in drawer (it was just a
logo + "Trees" link before). Used by both /trees and /import.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
