findPageHeadline() can return a non-string value and surface [object Object] in Docus headers

[onmax]

Environment

• @nuxt/content: 3.12.0
• docus: 5.8.1
• nuxt: 4.4.2

Reproduction

1. Create a fresh Docus app.
2. In content/1.getting-started/.navigation.yml, set an unquoted title containing : :

title: Getting Started: Basics
icon: false

3. Run a static build:

pnpm install
pnpm exec nuxt generate --extends docus

4. Open any child page in that section, for example /getting-started/introduction.

Actual behavior

The page headline renders as [object Object].

---

Docus could defensively coerce the headline before rendering, but the contract mismatch appears to start in @nuxt/content.

[farnabaz]

If you have : in string value in YAML you need to wrap it in quote string

title: "Getting Started: Basics"  
icon: false  

[onmax]

Yes, I know, I just wonder, if Docusnuxt-conten could improve the error or dx?

feel free to close this issue if you think current behaviour is ok. Just giving an idea, since this happened to me already 3 times in the past few months and it takes me a few minutes to realize why