112102e74a
- Adds button in the preferences backup settings to restore from a backup file. - Adds a dialog component `restore-from-backup` which will open a filepicker to select a HTML backup file to restore from, show the backup's date and prompt to input a password if needed. - Adds a stub `getBackupInfo` event to eventually return metadata and config JSON from `sampleArchive` in Bug 1901132. Does not yet implement: - Expanding the input to fit multiline files names. - Restoring the selected backup file. Figma: https://www.figma.com/design/vNbX4c0ws0L1qr0mxpKvsW/Fx-Backup?node-id=147-8701&t=zvoykS3OusX9YVCv-4 Differential Revision: https://phabricator.services.mozilla.com/D211248