573ba52f63
Root cause: the badge was `position: absolute` relative to the entire
`.nav-item`, which stretches to `flex: 1` on mobile (up to ~75 px wide).
With `right: 4px` the badge sat far from the icon on the bottom bar and
overlapped label text in the expanded desktop sidebar.
Fix: `updateOverdueBadge()` now wraps the nav icon in a
`.nav-item__icon-wrap` span (created once, reused on subsequent calls).
The badge is appended there instead of to the nav item root.
CSS changes:
- Remove `.nav-item .nav-badge` positional override
- Add `.nav-item__icon-wrap { position: relative; display: inline-flex }`
- Add `.nav-item__icon-wrap .nav-badge { position: absolute; top: -4px; right: -4px }`
The badge now consistently overlays the top-right corner of the icon
across all nav layouts (mobile column, collapsed sidebar row, expanded
sidebar row with label).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>