fix(ui5-tokenizer): scroll to end when adding tokens from suggestions

[Vonahz]

Fixes: #12104

Fix the visual issue when add/remove items through suggestions to tokenizer by scrolling tokenizer to the end.

[ndeshev]

You could adjust the PR title and description, the scroll to end improvement is specifically for the case when the items are being currently selected from the open suggestion popover

[cla-assistant]

All committers have signed the CLA.

[Copilot]

Pull Request Overview

This PR fixes a visual issue where the tokenizer was not scrolling to show the end of long tokens when adding/removing items through suggestions. The solution introduces intelligent scrolling behavior that automatically scrolls to the end when no specific token is focused, while preserving focused token visibility.

• Introduces a focused token tracking system (_focusedToken) to manage scroll behavior
• Adds automatic scroll-to-end functionality when tokenizer is expanded without a focused token
• Refactors token navigation and scroll logic for better user experience

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
packages/main/src/Tokenizer.ts	Implements the core scrolling fix with focused token tracking and intelligent scroll behavior
packages/main/src/MultiInput.ts	Removes redundant scroll calls that are now handled by the tokenizer automatically
packages/main/src/MultiComboBox.ts	Removes redundant scroll calls that are now handled by the tokenizer automatically
packages/main/cypress/specs/Tokenizer.cy.tsx	Adds comprehensive test coverage for the new scrolling behaviors