feat(apollo-vertex): customizable form wizard chrome [AGVSOL-4703]

[frankkluijtmans]

Stacked on #906. Gives consumers design freedom over the wizard chrome without forking its logic, across three levels. FormWizardSteps now takes a render-prop child so each step's markup can be customized while step and state wiring stay intact, and FormWizardNav is decomposed into reusable FormWizardBackButton / FormWizardNextButton parts that forward all Button props. For full control, the documented useFormWizardContext() path lets you rebuild the stepper and nav entirely (new headless demo shows a custom progress bar and buttons with no Stepper). Includes a "Customizing the design" docs section; typecheck, lint, format, and registry build all pass.

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[github-actions]

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Project	Deployment	Review	Updated (PT)
apollo-design	🟢 Ready	Preview, Logs	Jul 17, 2026, 08:17:41 AM
apollo-docs	🟢 Ready	Preview, Logs	Jul 17, 2026, 08:17:41 AM
apollo-landing	🟢 Ready	Preview, Logs	Jul 17, 2026, 08:17:41 AM
apollo-vertex	🟢 Ready	Preview, Logs	Jul 17, 2026, 08:17:41 AM

[github-actions]

Dependency License Review

• ✅ 1950 package(s) scanned
• ✅ No license issues found
• ⚠️ 2 package(s) excluded (see details below)

License distribution

License	Packages
MIT	1720
ISC	89
Apache-2.0	55
BSD-3-Clause	27
BSD-2-Clause	23
BlueOak-1.0.0	8
MPL-2.0	4
MIT-0	3
CC0-1.0	3
MIT OR Apache-2.0	2
(MIT OR Apache-2.0)	2
Unlicense	2
LGPL-3.0-or-later	1
Python-2.0	1
CC-BY-4.0	1
(MPL-2.0 OR Apache-2.0)	1
Unknown	1
Artistic-2.0	1
(WTFPL OR MIT)	1
(BSD-2-Clause OR MIT OR Apache-2.0)	1
CC-BY-3.0	1
0BSD	1
(MIT OR CC0-1.0)	1
MIT AND ISC	1

Excluded packages

Package	Version	License	Reason
@img/sharp-libvips-linux-x64	1.2.4	LGPL-3.0-or-later	LGPL pre-built binary, not linked
khroma	2.1.0	Unknown	MIT per GitHub repo, missing license field in package.json