feat(ui): component redesign pass and fixes, release ui 0.8.87

Redesign
- Shared field foundation rules (duplicated across 15 form components and
  emitted globally) are now identical everywhere, so later copies no longer
  silently override earlier redesigns.
- Drawn checkbox and radio controls, white switch thumbs (the thumb was the
  text colour, a black blob in light mode), recessed field wells, keycap
  actions in Modal, Drawer, Popover, Toaster, Pagination, Stepper, DataTable.
- Menus (Dropdown, ContextMenu, Popover, Select dropdown, Navbar panels) share
  one flat raised panel with neutral hover rows and mono section labels.
- Alerts with an accent rail and icon chip; card headers without the grey
  band; accordion, collapse, list, list group, timeline, stats, metrics,
  chat, skeleton, avatar group, clipboard, splitter, section, sidebar,
  navbar and upload progress restyled.
- Chart rebuilt: nice y-axis ticks, gridlines, rounded bars, line and area
  modes, hover tooltips, hidden series leave the scale.

Fixes
- Checkbox and radio labels toggle their input again (empty for="" broke it).
- TimePicker kept every clicked time pressed; only the chosen hour and
  minute are pressed now, and nothing is pressed before a value exists.
- ColorPicker hex readout now follows the picked colour.
- Disabled FileInput no longer shows the native file-input text.
- Date and time panels float instead of pushing content.
- ContextMenu opened at the pointer closes on scroll.
- Drawer left/top/bottom placements slide from their own edge again.
- Image-only Card no longer renders an empty body strip.
- Timeline supports item.time, current/upcoming states, sizes and
  compact/alternate variants; showcase demos use distinct variants.
- ChatBubble: delivery receipts (sending/sent/delivered/read/failed/error)
  and meta aligned to its bubble.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/ui/components/ListGroup.wrn

@@ -33,10 +33,33 @@ component ListGroup {
   style {
     .wrn-list-group { display:grid; gap:.75rem; color:var(--wrn-color-text); }
     .wrn-list-group > p { margin:0; font-size:.875rem; color:var(--wrn-color-muted); }
-    .wrn-list-group__items { border:1px solid var(--wrn-color-border); border-radius:var(--wrn-radius-md); overflow:hidden; }
-    .wrn-list-group button { display:flex; align-items:center; gap:.75rem; width:100%; padding:.85rem 1rem; text-align:start; border:0; color:inherit; background:var(--wrn-color-surface); font:inherit; font-size:.875rem; cursor:pointer; }
+    .wrn-list-group__items {
+      border: 1px solid var(--wrn-color-border);
+      border-radius: var(--wrn-radius);
+      overflow: hidden;
+      box-shadow: var(--wrn-shadow-1);
+    }
+    .wrn-list-group button {
+      display: flex;
+      align-items: center;
+      gap: .75rem;
+      width: 100%;
+      padding: .75rem 1rem;
+      text-align: start;
+      border: 0;
+      color: inherit;
+      background: var(--wrn-color-surface);
+      font: inherit;
+      font-size: .875rem;
+      cursor: pointer;
+      transition: background-color 120ms ease;
+    }
     .wrn-list-group button + button { border-top:1px solid var(--wrn-color-border); }
-    .wrn-list-group button[aria-pressed="true"] { background:var(--wrn-color-primary-soft); color:var(--wrn-color-primary-text); }
+    .wrn-list-group button[aria-pressed="true"] {
+      background: color-mix(in srgb, var(--wrn-color-primary) 8%, var(--wrn-color-surface));
+      color: var(--wrn-color-text);
+      box-shadow: inset 2px 0 0 var(--wrn-color-primary);
+    }
     .wrn-list-group button > [class*="icon-"] { width:1.1rem; height:1.1rem; flex:none; }
     .wrn-list-group small { display:block; margin-top:.2rem; color:var(--wrn-color-muted); font-size:.8rem; }
     .wrn-list-group__badge { margin-inline-start:auto; font-size:.75rem; }