Fix: Widen embed fields and unlock textarea drag-to-resize

[biast12]

Description

Two fixes to the embed builder.

Embed fields were cramped. EmbedFieldsEditor laid Field Name and Field Value side-by-side with md:grid-cols-2, but the editor already sits in the left half of a page-level md:grid-cols-2 editor|preview layout. Each input ended up at roughly a quarter of the content width. Field Name now stacks above Field Value, so both span the full editor column — about double the width.

Drag-to-resize did nothing. The shared Textarea was resize-y max-h-50 h-50. In Tailwind v4 h-50 and max-h-50 are both 12.5rem, so the max-height cap equalled the default height — the native resize grip could only shrink the box, never grow it. Dropping the cap makes textareas freely resizable. h-50 stays, so the default rendered height is unchanged at 200px everywhere.

The Textarea fix applies app-wide (19 importers), not just to embed fields — no textarea in the dashboard could be dragged taller before this. No call site passes a height-related class (Textarea's className prop lands on the outer wrapper div, never on the <textarea>), so there is no call-site churn.

Type of Change

• Bug fix
• New feature
• Breaking change

Checklist

• My code follows the style of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works