refactor(soma): de-dup CssField Input via renderProps (spin-field family)

Mirrors the NumberField Input reference. CssField morfo's aria-required/disabled/
readonly/invalid gain `ariaBoolean`; the Input provider drops the hardcoded role +
data-spin-field-input + those four aria booleans — all now from renderProps().
Soma keeps the CSS-value-specific bits it genuinely owns: the parsed aria-valuenow,
soma-only aria-valuemin/max, aria-valuetext, native form attrs, handlers.

Verified in browser (role/aria/data from morfo, parsed aria-valuenow="16") +
soma/morfo tests 71/71. Both spin-field inputs are now fully morfo-sourced; the
triggers/scrubber + the other families remain on the backlog.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/uix/morfo/components/css-field.ts

@@ -100,10 +100,30 @@ export const cssFieldMorfo = {
 			aria: [
 				{ attr: 'aria-valuenow', value: v.propRef('value'), severity: 'optional' },
 				{ attr: 'aria-valuetext', value: v.propRef('value'), severity: 'recommended' },
-				{ attr: 'aria-required', value: v.propRef('required'), severity: 'optional' },
-				{ attr: 'aria-disabled', value: v.propRef('disabled'), severity: 'optional' },
-				{ attr: 'aria-readonly', value: v.propRef('readonly'), severity: 'optional' },
-				{ attr: 'aria-invalid', value: v.propRef('invalid'), severity: 'optional' }
+				{
+					attr: 'aria-required',
+					value: v.propRef('required'),
+					severity: 'optional',
+					ariaBoolean: true
+				},
+				{
+					attr: 'aria-disabled',
+					value: v.propRef('disabled'),
+					severity: 'optional',
+					ariaBoolean: true
+				},
+				{
+					attr: 'aria-readonly',
+					value: v.propRef('readonly'),
+					severity: 'optional',
+					ariaBoolean: true
+				},
+				{
+					attr: 'aria-invalid',
+					value: v.propRef('invalid'),
+					severity: 'optional',
+					ariaBoolean: true
+				}
 			],
 			keyboard: [
 				{ key: 'ArrowUp', action: 'increment' },

src/uix/soma/components/css-field/css-field-provider.svelte.ts

@@ -529,10 +529,11 @@ export class CssFieldInputProvider {
 	readonly props = $derived.by(() => {
 		const p = this.provider.parsed;
 		return this.runtimePart.assert({
-			...this.runtimePart.props,
-			role: 'spinbutton' as const,
+			// Morfo-declared: role, data-spin-field-input, aria-required/disabled/
+			// readonly/invalid (the last four via ariaBoolean). Soma adds only the
+			// CSS-value-specific aria below + handlers/native.
+			...this.runtimePart.renderProps(),
 			inputmode: 'text' as const,
-			'data-spin-field-input': '',
 			autocomplete: 'off' as const,
 			autocorrect: 'off' as const,
 			spellcheck: false,
@@ -542,10 +543,6 @@ export class CssFieldInputProvider {
 			'aria-valuemin': this.provider.opts.min.current,
 			'aria-valuemax': this.provider.opts.max.current,
 			'aria-valuetext': this.provider.opts.value.current || undefined,
-			'aria-required': boolToStr(this.provider.isRequired),
-			'aria-disabled': boolToStr(this.provider.isDisabled),
-			'aria-readonly': boolToStr(this.provider.isReadonly),
-			'aria-invalid': boolToStr(this.provider.isInvalid),
 			'aria-describedby': this.describedBy,
 			disabled: this.provider.isDisabled || undefined,
 			readonly: this.provider.isReadonly || undefined,