docs: warn about datetime timezone and datalist filtering quirks

[ignsm]

Three small DX fixes for recently shipped fields:

1. datetime timezone warning — <input type="datetime-local"> emits no timezone. Most APIs expect ISO 8601 with TZ. Added a :::warning block in docs/guide/fields.md with a one-liner new Date(local).toISOString() recipe and a pointer to richer custom components.

2. autocomplete datalist quirks — Native <datalist> filters by value, not label, and doesn't enforce that the typed value is in the list. Both are surprising defaults; warning block now states them up front.

3. SSR migration note in CHANGELOG — Apps that wrapped FormRenderer in next/dynamic({ ssr: false }) to avoid the prior crash can drop the wrapper and recover prerendering. Added a diff snippet under ### Migration notes in the Unreleased section.

No code changes. Docs site builds clean (pnpm docs:build).

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Project	Deployment	Actions	Updated (UTC)
formhaus	Ready	Preview, Comment	May 10, 2026 2:10pm