[hutiefang76]

What's Changed

splitAndTransfer allocates a new view buffer but only writes the length and payload of inline values. When the allocator returns non-zero memory, the remaining bytes violate the view layout's zero-padding requirement. Clear just the unused inline bytes after copying the payload; the long-value path is unchanged.

Add deterministic regressions for UTF-8 and binary views using buffers prefilled with 0xff. They cover lengths 0, 1, 11, 12 and 13, nulls, a non-zero split offset, source preservation and allocator cleanup. Both new tests fail against the unmodified implementation with an unexpected 0xff padding byte.

Validation on JDK 21:

• mvn -B -ntp -Dmaven.gitcommitid.nativegit=true -pl vector -am verify passed. The vector module ran 1193 cases in each of its two configured allocator executions, with 4 skipped per execution and no failures or errors.
• The full TestVariableWidthViewVector class passed all 59 cases in each execution, with no skips.
• Spotless and Checkstyle passed. The native Git option is needed locally for the existing Git plugin's worktree support; no build configuration was changed.

Closes #1386.

_{AI-generated PR description. Source investigation, implementation and automated review assisted by Codex and DeepSeek.}