TableBuilder column separators overlap other widgets if .resizable is set to true

**Describe the bug**
When drawing TableBuilder.resible(true), column separators take all vertical space overlapping with other widget below! See pictures below for a comparison!

**To Reproduce**
1. Set TableBuilder.resible(true)
2. Display something after the table (like a label for example)

**Expected behavior**
Table separators should stop when the last row of the table is drawn.

**Screenshots**
Behaviour with TableBuilder.resible(true)

Behaviour with TableBuilder.resible(false)

**Desktop (please complete the following information):**
Happens on both macOS Tahoe 26.0.1 and on Windows 11

First reproduce the issue with TableBuilder.resizable(true) and a label displayed below the table, comparing it with resizable(false). Trace the TableBuilder rendering and layout entry points, then verify that column separators stop at the last row and no longer overlap the following widget.

Written by the indexing model from the issue text.