[JanJakes]

OPTIMIZE TABLE and REPAIR TABLE report rebuild errors as result rows. The surrounding transaction then commits the work completed before the error, leaving hidden tables or a partly rebuilt table.

This change makes each table administration operation atomic with an internal savepoint. A failed rebuild restores the original schema and data, while successful rebuilds of other tables are preserved. Existing user transactions and savepoints remain active.

Regression tests cover failures while copying rows, dropping the old table, and recreating indexes, including temporary tables, repeated failures, mixed results, and user transactions.

Fixes #549.

[coderabbitai]

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