improvement(emcn): share larger chip and field geometry
Auth fields currently override ChipInput height locally, and full-width chip actions center their labels through descendant classes. Add shared size="lg" geometry to Chip, ChipLink and ChipInput, plus align="center" for chip actions; migrate AuthInput to the shared size.
Defaults stay 30px. Auth geometry remains 36px (45px with enlarged root text). Centered long labels can shrink in narrow layouts. Two wrapper type exclusions keep marketing CTA sizes and secret fields on their existing APIs; their rendering is unchanged.
Validation: all 26 workspace type checks, import/API audits, lint and 381 EMCN tests pass. Both conformance linters ran against the actual base: the AuthInput height override is removed, no new usage violations. Browser comparisons cover both themes, hover, focus, disabled/error states, enlarged text and narrow forms using actual components in a labeled local fixture; native form submission was exercised. Auth service calls were not exercised. Before/after screenshots follow in a comment.