IQSS / dataverse-frontend / 25379054046

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Tree-view a11y / focus polish + expose two-pass strategy in the tray

Streaming-zip:
- New `deferCurrentToEnd()` API on the engine. The pause-on-fail
  failure dialog gets a fourth button, "Skip & retry at end", which
  switches the strategy to twopass mid-flight. Subsequent failures
  accumulate without pausing; the existing two-pass UI takes over at
  the end of the first pass and offers `retryFailed()`.
- New Cypress case covers the defer-to-end → second-pass-success flow.
- Tray switches `role="dialog"` → `role="region"` (it never traps
  focus and announces via `aria-live="polite"`; dialog is the wrong
  role for a passive status panel).

A11y / focus:
- Tree row gains a visible `:focus-visible` ring (inset box-shadow
  works around the absolute-positioned row clipping a normal outline).
- Loading and empty viewport states get `role="status" aria-live="polite"`;
  the root error state gets `role="alert" aria-live="assertive"`.
  Decorative glyphs are `aria-hidden`.
- Toolbar gets `role="toolbar"` + an `aria-label`. Selection summary
  becomes `role="status" aria-live="polite"` so screen readers
  announce the running file count.
- `FilesTreeCheckbox` is removed from the page tab order (`tabIndex=-1`):
  the WAI-ARIA tree pattern routes selection through the focused row's
  Space handler, so every-row-tabbable is wrong here and creates a long
  tab chain. Mouse + space-on-row both still work.

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