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Fixes #1517.
Roll back only the COPY's own row versions. Truncate physical rows only for an owned trailing range with no other writer; retain shared slots and their pages until checkpoint so another COPY keeps its rows and offsets. Also avoid unsigned underflow when reserving an already large enough primary-key index after a large rollback.
Validation: 24 new concurrent COPY regression cases; 60 transaction/recovery tests; 68 storage tests; 34 COPY E2E tests in both disk and in-memory modes (220 passing executions total). clang-format 18.1.8 passes for all tracked C/C++ files.