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LanceDB default vector column discovery only considered top-level fields, so tables with a single nested vector leaf still required users to pass an explicit field path. This updates Rust and Python discovery to recurse into struct fields, return canonical field paths, and preserve actionable errors when no default or multiple defaults exist. The explicit nested path flow for index creation and search remains supported across Rust, Python, and Node, with regression coverage for single nested vector leaves, multiple candidate leaves, and schemas without vector leaves. Closes #3405.