fix(ui5-toolbar): fix visual findings in the toolbar

[PetyaMarkovaBogdanova]

Three CSS bugs in ui5-toolbar identified via visual spec analysis against the AI test review.

Changes

• Toolbar.css — Fix swapped variable names in padding shorthand. padding: 0 right 0 left was referencing --_ui5-toolbar-padding-left for the right slot and vice versa:

  /* Before (wrong) */
  padding: 0 var(--_ui5-toolbar-padding-left) 0 var(--_ui5-toolbar-padding-right);
  
  /* After (correct) */
  padding: 0 var(--_ui5-toolbar-padding-right) 0 var(--_ui5-toolbar-padding-left);

• Toolbar-parameters.css — Bump --_ui5-toolbar-item-margin-right from 0.25rem → 0.5rem to match the visual spec.

• ToolbarItem.css — Remove display: inline-block from :host. This was preventing flex-based responsive sizing for slotted content (e.g. ui5-breadcrumbs) because inline-block constrains the host to shrink-to-content width rather than participating correctly in the toolbar's flex layout.
  Fixes: Toolbar: some adjustments needed #13508

[sap-ui5-webcomponents-release]

🚀 Deployed on https://pr-13653--ui5-webcomponents-preview.netlify.app

[sap-ui5-webcomponents-release]

🧹 Preview deployment cleaned up: https://pr-13653--ui5-webcomponents.netlify.app