Multiline copy truncates spaces between lines

### Describe the bug

Multiline drag selection & right click to copy truncates spaces around lines.

### Affected version

GitHub Copilot CLI 1.0.57-4

### Steps to reproduce the behavior

The example here is from a changelog, but the phenomenon appears in user prompt/agent responses too.

1. Prepare a multi-line text.

For example, `/changelog last 10`.

2. Drag and select multiline text, where the word

I'll select the sentence starting with "Context window tier..."

3. Right click to copy it

4. I get no spaces between "tier-dervied" and "limits"

> - Context window tier selection now persists durably in session events and survives SDK-only resume paths so tier-derivedlimits are reapplied to request, compaction, and truncation logic without app-level repair

### Expected behavior

Spaces are correctly preserved, so that copy-pasting keeps the original content

### Additional context

_No response_

Reproduza o problema no GitHub Copilot CLI 1.0.57-4 usando as etapas de seleção de várias linhas e cópia com o botão direito, especialmente o exemplo do changelog que contém “tier-derived limits.” Rastreie o caminho de seleção de várias linhas e cópia para a área de transferência da CLI e verifique se o texto copiado preserva os espaços entre as linhas e corresponde ao conteúdo selecionado.

Escrita pelo modelo de indexação a partir do texto da issue.