feat(ui5-hero-banner): introduce Hero Banner component

[tsanislavgatev]

Summary

This PR introduces a brand-new ui5-hero-banner component for Fiori pages.

ui5-hero-banner provides a flexible, responsive banner area for product home pages, including:

• greeting/header text
• optional overline/context text
• configurable content layout
• configurable header/actions placement
• dedicated slots for primary content, secondary content, and actions

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Motivation

Many product home pages need a reusable “hero” section that can combine:

• contextual header information
• quick actions
• custom business content (KPIs/cards/search/widgets)

This PR adds a dedicated component for that use case, with responsive behavior and clear placement rules for header/actions/content.

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Public API

Properties

• headerText
  Main headline of the banner.

• overlineText
  Smaller contextual text shown above the headline.

• columnsRatio
  Controls how content is split when both content areas are used:

  • Equal (1:1)
  • FirstWider (2:1)
    If not set, content behaves as single-column.

• actionsPlacement
  Controls where actions are rendered:

  • TopEnd (top/right-end area in header)
  • BottomStart (below header text, left/start aligned)

• headerBlockPlacement
  Controls vertical placement of the header block:

  • Top
  • Bottom
    (Bottom mode follows defined layout conditions for predictable behavior.)

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Slots

• Default slot (startContent)

  • Primary content area.
  • Receives content without a slot attribute.
  • Typical usage: KPI cards, search, summary widgets, filters, shortcuts.

• endContent

  • Secondary content area.
  • Rendered as the second column when columnsRatio is set.
  • On small screens, stacks below default slot content.
  • In specific placement combinations, can stretch to preserve visual balance.

• actions

  • Header action area for quick tasks (buttons, links, icon buttons).
  • Supports multiple action elements.
  • Placement follows actionsPlacement and related layout rules.

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[ui5-webcomponents-bot]

🧹 Preview deployment cleaned up: https://pr-13230--ui5-webcomponents.netlify.app

[sap-ui5-webcomponents-release]

🎉 This PR is included in version v2.23.0 🎉

The release is available on v2.23.0

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