feat(backup): add automatic weekly encrypted backups
A silent safety net against in-app data loss or DB corruption, with zero friction. Driven off the app lifecycle (startup + when hidden), it writes a sealed .tanemaki copy into the app's private storage once a week, keeping the newest 3 (rotating). Reuses the manual backup's encryption via the extracted ExportImportService.buildSealedBackup(); never throws, so a failed copy can't crash startup or backgrounding. Not registered on web (no file storage). Settings shows a quiet reassurance line with the date of the last automatic copy (localised via intl), hidden where no automatic backup exists.
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/// To regenerate, run: `dart run slang`
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///
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/// Locales: 3
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/// Strings: 923 (307 per locale)
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/// Strings: 932 (310 per locale)
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///
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/// Built on 2026-07-10 at 01:06 UTC
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/// Built on 2026-07-10 at 08:15 UTC
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// coverage:ignore-file
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// ignore_for_file: type=lint, unused_import
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