[node-projects/web-component-designer#464] unit editor addons

[jogibear9988]

Ticket: #464

AI summary

Implemented staged unit-editor addon support in web-component-designer.

Implementation evidence

Properties can now provide unitEditorAddon, which receives current value/selection plus commit and preview callbacks and returns a control hosted beside the numeric unit editor. Public addon types are exported; a regression test covers configuration propagation. Demo repository unchanged.

Independent completion audit

Passed: Staged implementation satisfies the ticket: CSS unit properties can supply a custom control beside the numeric unit editor, suitable for a rotation-style popup/control.

Checklist verified: (1) generic special-unit addon contract: IProperty exposes unitEditorAddon and public UnitEditorAddon/UnitEditorAddonContext types are exported; (2) propagation: getCssNumericEditorConfig carries the property addon into the runtime unit-editor config; (3) runtime hosting: UnitPropertyEditor creates the addon and assigns it to NumericStyleInput, whose addon container is rendered beside input, unit selector, and stepper; (4) integration: context exposes current value and design items plus commit, preview, and preview-removal callbacks routed through the existing property-service/undo and CSS !important proxy paths; (5) compatibility: absent addons leave the existing unit-editor paths unchanged. The supplied screenshots establish the requested rotation-popup use case; the implementation intentionally provides the reusable extension point rather than hard-coding a rotation control. Searches found no stale/alternate unit-editor configuration path or old repurposed field needing migration. Staged diff is limited to the six claimed library/test files and git diff --check reports no whitespace errors.

Validation

Agent-reported required validation: passed.

Ran npm run build successfully, then npm test -- --runInBand: 13 suites and 118 tests passed. Initial test run required building generated dist imports first. Staged only the six intentional library/test files; cached diff check passed.

No application-controlled validation commands configured.

Created automatically as a draft for human review.

[jogibear9988]

not only add the possibility, also add a addon directly for angles, as shown in the screenshots

[jogibear9988]

[AI Ticket Worker] Addressed in the latest update.