fix: recover failed deck renames

[KaelSensei]

Outcome

Failed deck renames restore the prior displayed name when the attempted name is still current and show a retry notification. A different newer name remains untouched. Deleted decks are not recreated or warned about. English user guide updated.

TDD

Observed focused Red in store-core.test.ts: expected Test Deck, received New Name. Updated the existing test that characterized the unwanted behavior, then implemented minimal rollback. Supplementary passing characterization covers retry feedback, a different newer successful name, and deletion during the pending rename. Broader concurrent rename ordering, repeated identical names and confirmed-baseline recovery remain open; no general serialization claimed.

VPS validation

3,050 tests across 274 files passed; TypeScript, lint, production build and diff checks passed. Full blocking Docker Playwright: 66 passed in isolated Compose, with server diagnostic logging, unchanged exclusions and no retries or bypass. Prior intermittent test-server issue remains documented and is not claimed fixed. Sonar attempted locally: configuration absent; CI advisory result will be recorded before merge. Dedicated roadmap/changelog/progress documentation follows merge into dev.

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Project	Deployment	Actions	Updated
magic-ai-builder	Ready	Preview	Oct 8, 2026 9:40am UTC

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