refactor(text-editor): extract editor-config to enable real-stack testing

[john-traas]

What

Extracts the text editor's schema and plugin assembly out of the limel-prosemirror-adapter component into a pure, importable module, and adds an integration test that exercises the real editor stack.

• refactor: initializeSchema() / createEditorState() (private methods on the adapter) → pure buildEditorSchema() / buildEditorPlugins() in editor-config.ts. The component delegates to them; plugin order and behaviour are preserved exactly.
• test: editor-config.spec.ts builds the production schema + the real ordered plugin list and asserts, using the official prosemirror-test-builder:
  • commands produce the expected transaction;
  • the link/image handlePaste ordering contract (ProseMirror is first-truthy-wins) — guarding against a new/changed plugin silently shadowing another on a shared event;
  • a transaction sequence keeps the document structurally valid.
• build: adds a clean script (shx rm -rf .stencil dist www) and the prosemirror-test-builder dev dependency.

Why

The editor is now used across the CRM, so we need regression coverage for cross-plugin interactions (paste / keymap / transaction chains). Those only surface when the real, full plugin set runs against the real schema — previously impossible because the schema and plugin list were private to the component. This unblocks that, tests against source (immune to stale-dist issues), and needs no bespoke test-harness suite.

Verification

• npm run test:spec: 884/884 pass (incl. the new spec)
• text-editor e2e: 14/14 pass
• Behaviour-preserving: no plugin order or logic changes.

🤖 Generated with Claude Code

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Documentation has been published to https://lundalogik.github.io/lime-elements/versions/PR-4139/