Studio converts date-only frontmatter to ISO and triggers conflicts even with z.string().date()

[Joehoel]

Environment

• OS: macOS (darwin)
• Node: 22.22.0
• Nuxt: 4.3.0
• @nuxt/content: 3.11.0
• nuxt-studio: 1.1.1

Reproduction

1. Use a collection with schema:

   publishDate: z.string().date()

2. Have content frontmatter with date-only values:

   publishDate: 2025-06-22

3. Deploy site.
4. Open /admin and log into Nuxt Studio.
5. Studio shows conflict and loads publishDate as 2025-06-22T00:00:00.000Z.
6. Clearing drafts/cookies and re-login still shows ISO conversion.

Expected

Date-only frontmatter stays as YYYY-MM-DD, and no conflict is triggered.

Actual

Studio (or the content DB it loads) rewrites date-only fields as ISO (T00:00:00.000Z), causing a persistent conflict.

Related

Possibly related to #133 (date conversion) and #251 (conflict/mismatch).

[maximepvrt]

@Joehoel I'm working on a fix here : nuxt/content#3698