fix(ui5-breadcrumbs): acc findings fixed

[PetyaMarkovaBogdanova]

7) Breadcrumbs (10 failing)

• Landmark uniqueness failures (duplicate navigation labeling patterns).
• Interaction issues in overflow/popover flows in interactive tests.
• Includes failures in scenarios like selecting overflow item and focus/closure flow.

Component	Issue	Not by spec	Good to have	Spec refs	Spec quote sentence	Coverage strength
Breadcrumbs	Duplicate navigation labeling	Likely Yes	No	ACC-267, ACC-264	"Container (div or nav) should have role=navigation and aria-label=Breadcrumb Trail" and "Label 'Breadcrumb Trail' must be announced on entry"	Partial (uniqueness not explicit in extracted quote)
Breadcrumbs	Overflow/popover keyboard/focus failures	Likely Yes	No	ACC-270, ACC-272, ACC-269	"Focus must be put inside dialog on active control" and "Like any other Popover (role=dialog and so on)"	Direct

[ui5-webcomponents-bot]

🚀 Deployed on https://pr-13557--ui5-webcomponents-preview.netlify.app

[yanaminkova]

I don't think it's correct to use the current location text as the label for the entire breadcrumbs component.
In my opinion, if we want to fix the error "nav does not have a unique accessible", we should introduce accessibleName property.