[2.x] fix(admin): keep extension danger badge visible on long names

[imorland]

Summary

In the admin sidebar's extension list, abandoned extensions show a red ! danger badge (or yellow warning badge for abandonment without a replacement). When the extension's display name is long enough to trigger the ellipsis-truncation on .Button-labelText, the badge — rendered as a sibling of the title text inside the truncated label — gets clipped by the overflow: hidden and disappears off the right edge.

Originally reported in #4592 against 1.x; the same code path exists on 2.x.

Fix

Move the badge from inside the truncated button label into ExtensionLinkButton::statusItems(), alongside the enabled/disabled status dot. The status items render as siblings of .Button-label (not inside it), so they're not affected by the label's overflow: hidden.

Position the badge absolutely to the left of the existing status dot. Vertically align it by matching the dot's margin-based centering — the dot uses margin: 6px 5px to center its 10px height in the button content area; the 16px-tall badge uses margin: 3px 0 to center identically.

Files

• framework/core/js/src/admin/components/AdminNav.js — stop rendering the badge inside the ExtensionLinkButton children.
• framework/core/js/src/admin/components/ExtensionLinkButton.js — add the badge to the statusItems ItemList when extension.abandoned is truthy, with priority 10 so it renders before the status dot.
• framework/core/less/admin/AdminNav.less — position the badge absolutely, to the left of the status dot, vertically aligned to match.

Test plan

• Reproduced the original bug on dev: with a long-named extension marked abandoned (via app.data.extensions[id].abandoned = '...'), the danger badge is invisible / clipped off the right edge of the sidebar.
• With the fix applied: the badge is visible adjacent to the status dot regardless of name length.
• Non-abandoned extensions still render the status dot in the same position with no badge.
• Label text still truncates with ellipsis on long names.
• Visual alignment of badge and dot verified.

Closes #4592