Add optional filename field to export dialog with automatic .json
extension handling. Extract resolveFilename() for testability. Add
tests for includeHistory flag, bundleToJson, and filename resolution.
Add export format compatibility note to CLAUDE.md.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Add export dialog with download/clipboard options and optional
undo/redo history inclusion (default off). Extract shared Dialog
component to ui/dialog.tsx, consolidating open/close lifecycle,
backdrop click, and escape key handling from all 6 dialog components.
Update spec to reflect export method dialog and optional history.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Replace direct file picker trigger with a modal offering two import
methods: file upload and paste JSON content. Uses a textarea instead
of navigator.clipboard.readText() to avoid browser permission prompts.
Also centers both import dialogs and updates spec for clipboard import.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Export and import encounter, undo/redo history, and player characters
as a downloadable .json file. Export/import actions are in the action
bar overflow menu. Import validates using existing rehydration functions
and shows a confirmation dialog when replacing a non-empty encounter.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
