feat(concurrency): guard layout and about-me writes against a concurrent overwrite

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Extract the dashboard-layout optimistic-concurrency mechanism (issue #581)
into a shared server helper (takeBaseToken plus guardedUserUpdate /
guardedRowUpdate) and a client helper (readUpdatedAtToken, withBaseToken,
isConflict). Retrofit the dashboard-widgets route onto the helper and apply the
same guard to the insights layout, medications layout, and coach about-me write
endpoints.

A request that omits the base token keeps the byte-identical unconditional
write, so older clients are unaffected. Document the contract in the OpenAPI
registry, including the dashboard-widgets path that was previously absent.

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Marc-André Bombeck committed 2026-07-24 16:26:58 +02:00

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