feat(gh-999): default Header logo form values on add

[wesleyboar]

Overview

Pre-fills the Header logo plugin admin form when adding a new instance so editors see home link, height, original-size cropping, and margin defaults (PR #1083 to-do).

Related

• supports feat: GH-999 let CMS admin change header logo #1083
• supports Let CMS Admin Edit Header #999

Changes

• added HeaderLogoForm with add-only defaults
• updated HeaderLogoPlugin to use the form
• updated Let CMS Admin Edit Header #999 plan follow-up note (settings / Core-Styles parity deferred)

Testing

1. Delete Header logo from header-content if present.
2. Add TACC Header → Header logo; confirm form shows home page link, height 50, use original image, Attributes class mr-5.
3. Save, publish; confirm logo renders with link and expected markup.
4. Edit existing plugin; confirm defaults are not re-applied.

UI

Delete.Instance.Add.Instance.mov

Edit.Instance.Check.Instance.mov

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