Documents now live in an IndexedDB library instead of a single
localStorage slot: each has its own ?doc=<id> URL, a title (editable in
the toolbar, used for export file names) and appears in Datei ›
Dokumente (open, rename, duplicate, delete). New/sample/import create
new documents instead of replacing the open one. Tabs stay in step via
BroadcastChannel. The old localStorage document is migrated once.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
wkhandClaude Opus 5.5
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