feat(form): integrate sc into ew/nx2

[kozmaadrian]

Port the structured-content form block into nx2

Summary

Ports the schema-driven form block from nx/blocks/form (v1) into nx2/blocks/form, rebuilt to nx2 conventions and Spectrum 2 design.

How it was ported

Engine — vendored da-sc-sdk. The structured-content engine is vendored into nx2/deps/da-sc-sdk (with a build:da-sc-sdk:nx2 script).

Utils — cloned onto the nx2 api. The form's utils/ (context, da-api, persistence, schemas) were brought over and adapted to the nx2 utility/api layer (loadStyle, hashChange, daFetch, …).

Fields — rebuilt as Spectrum 2 web components. Each field is its own Lit element module under fields/:

• sl-input, sl-picker, sl-checkbox, sl-button (accent/secondary variants), sl-number-field.
• A shared defaults module supplies the common field chrome (label, required marker, error text, description slot), adopted alongside each field's own stylesheet via adoptedStyleSheets + the loadStyle(import.meta.url) convention.
• No Spectrum Web Components dependency — Spectrum 2 design is expressed purely through --s2-* tokens (per AGENTS.md: "Spectrum design, not Spectrum libraries").
• Each consumer imports the field modules it renders directly (the editor imports all five; the shell imports the picker + button it uses) — no central barrel.

Views — cloned with S2 styling. editor, sidebar, and preview, plus the array UI (array-menu, reorder), restyled to Spectrum 2.

Icons load from .svg files through the themeable icon() helper (currentColor), matching the nx2 icon convention.

Shell — ctx-driven nx-form. form.js is a thin Lit shell: it reads the hash, resolves schema/document context, instantiates the engine, wires editor/sidebar/preview, and attaches persistence (cleaned up on teardown).

Preview / publish open at the structured-content renderer URL (via the ew-actions integration).

Conventions followed

• nx2 lazy-loading (dynamic imports in firstUpdated, null-checked usage).
• Spectrum 2 via --s2-* tokens; light/dark through light-dark().
• Self-contained, per-element field modules (portable to a shared location)

Test url: https://da.live/formnx2?nx=form-ew#/exp-workspace/frescopa/forms/ai-evolution

The chat window is gated by the ew.enabled flag.

Screen 0: Chat deactivated

Screen 1: Select Schema

Screen 2: Empty document

Screen 3: Existing document

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Commits

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[kozmaadrian]

Used here https://github.com/adobe/da-nx/pull/508/changes#r3403633524

[auniverseaway]

This file location should be scoped to the SC block. It looks to be purely for SC.

The filename is also a bit misleading as it looks like it implies overlap with api.js.

[mhaack]

Yes lets move this to the block 👍