Skip trailing nulls in SuffixStream

[zakkak]

Some prompts like starship in zsh emit these after the prompt

Closes #244

[zakkak]

CI failure is not related to the PR. It fails on master as well https://github.com/Hyperfoil/qDup/actions/runs/17438998410/job/49516715651#step:8:411

[zakkak]

Output is broken though, e.g.:

14:23:06,061 [ test:tryme-23 @ server ] script-cmd: tryme
14:23:06,062 [ test:tryme-23 @ server ] tryme
14:23:06,068 [ test:tryme-23 @ serwhoamiw
14:23:06,075 [ test:tryme-23 @ server ] zakkak
14:23:06,077 [ test:tryme-23 @ server ] %                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
14:23:06,078 [ test:tryme-23 @ server ]  
14:23:06,089 [ test:tryme-23 @ server ] 
14:23:06,190 [ test:tryme-23 @ server ] <_#__qdup__#
14:23:06,204 [ test:tryme-23 @ server ] exportecho
14:23:06,210 [ test:tryme-23 @ server ] 0