fix: FileTree component outputs extra ellipsis (4 en pages affected)

## Problem

FileTree component outputs `...` text where baseline doesn't.

**Affected**: ~4 en pages × 14 locales ≈ 56 pages total

## Example

```
markflow: "src/ ... .env astro.config.mjs"
baseline: "src/ .env astro.config.mjs"
```

Sample files: `en/guides/cms/apostrophecms`, `en/guides/cms/storyblok`, `en/guides/content-collections`