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/Card.wrn

@@ -324,7 +324,10 @@ component Card {
 
   style {
     .wrn-next__card-custom-footer:empty { display:none; }
-    .wrn-next__card-header:not(:has(strong,h1,h2,h3,h4,p,button,[data-slot])), .wrn-next__card-footer:not(:has(> span, > a, > .wrn-next__card-custom-footer:not(:empty))) { display:none; }
+    /* An image-only card renders empty regions that hold only <template>
+       markers; collapse them so the image is the whole card. */
+    .wrn-next__card-body:not(:has(> :not(template))) { display: none; }
+    .wrn-next__card-content:not(:has(.wrn-next__card-body > :not(template))):not(:has(.wrn-next__card-header :is(strong, h1, h2, h3, h4, p, button, [data-slot]))):not(:has(.wrn-next__card-footer > :is(span, a), .wrn-next__card-custom-footer:not(:empty))) { display: none; }    .wrn-next__card-header:not(:has(strong,h1,h2,h3,h4,p,button,[data-slot])), .wrn-next__card-footer:not(:has(> span, > a, > .wrn-next__card-custom-footer:not(:empty))) { display:none; }
     .wrn-next__card-media--overlay {
       aspect-ratio: 16 / 9;
       min-height: 18rem;
@@ -410,7 +413,44 @@ component Card {
     }
 
     .wrn-next__card-header {
-      border-bottom: 1px solid var(--wrn-color-border);
+      align-items: flex-start;
+      padding-block: 1rem 0.875rem;
+      border-bottom: 1px solid color-mix(in srgb, var(--wrn-color-border) 75%, transparent);
+      background: transparent;
+    }
+
+    .wrn-next__card-heading {
+      display: grid;
+      min-width: 0;
+      gap: 0.2rem;
+    }
+
+    .wrn-next__card-header h3 {
+      margin: 0;
+      color: var(--wrn-color-text);
+      font-size: 0.9375rem;
+      font-weight: 620;
+      letter-spacing: -0.012em;
+      line-height: 1.35;
+    }
+
+    .wrn-next__card-header .wrn-next__card-subtitle {
+      margin: 0;
+      color: var(--wrn-color-text-muted, var(--wrn-color-muted));
+      font-size: 0.8125rem;
+      font-weight: 450;
+      letter-spacing: 0;
+      text-transform: none;
+    }
+
+    .wrn-next__card-eyebrow {
+      margin: 0;
+      color: var(--wrn-color-primary-text, var(--wrn-color-primary));
+      font-family: var(--wrn-font-mono, monospace);
+      font-size: 0.6875rem;
+      font-weight: 600;
+      letter-spacing: 0.08em;
+      text-transform: uppercase;
     }
 
     .wrn-next__card-footer {
@@ -763,7 +803,7 @@ component Card {
 
         .wrn-component p {
           margin: 0;
-          color: var(--wrn-color-muted);
+          color: var(--wrn-color-text-muted, var(--wrn-color-muted));
           line-height: 1.6;
         }
   }