CSS: inline-filter pill-dropdown styling
Adds five new style components beneath the existing .filter-pill rules:
1. .filter-pill--editable — pointer cursor, hover tint, chevron rotation
2. .filter-pill--dirty — accent outline + pulsing orange dot
3. .filter-popover — absolute-positioned dropdown with shadow;
on mobile (<576px) anchors to bottom of
viewport full-width
4. .apply-filters-group — slide-in animation on the Apply/Reset buttons
5. .filter-toast-container — fixed top-right stack for cross-filter
auto-remove notices; slide-in/out animations
All colours via existing design tokens (--accent, --bg-card,
--text-primary, --border-default, --bg-inset) so dark + light themes
work automatically. z-index layering (popover 1040, toast 1060) stays
below Bootstrap modals (1055+) to avoid stacking conflicts.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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