fix: render only visible row detail lines

[riii111]

Problem

Row Detail rendered every line before applying scroll, which made large values expensive and wrapped large vertical offsets through Ratatui's u16 scroll range.

Background

Large TEXT or JSONB values can produce more lines than the renderer's vertical offset type can represent.

Approach

Build only the visible Row Detail lines from the current scroll offset and render them without relying on Paragraph's vertical scroll offset. Add coverage for tail rendering beyond the u16 range.

[linear]

SAB-319

[coderabbitai]

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