feat(backup): sealed backups + printable recovery sheet
'Save a backup' now writes a sealed .tanemaki file (AES-256-GCM under a key HKDF-derived from the root seed; format TANEBK v1, open and stable). Restoring on the same identity is silent; a copy sealed by another identity asks for the printed recovery code (TANE1 base32, typo-tolerant) and adopts that seed — recovering your bank recovers you. Legacy plain exports still restore. Settings gains a recovery sheet (QR + code PDF). BackupBox/RecoveryCode live in commons_core, pure Dart, TDD.
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/// To regenerate, run: `dart run slang`
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/// Built on 2026-07-09 at 20:14 UTC
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/// Built on 2026-07-09 at 20:28 UTC
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// coverage:ignore-file
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