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/Toaster.wrn

@@ -699,12 +699,12 @@ component Toaster {
       align-items: flex-start;
       gap: 0.7rem;
       overflow: hidden;
-      padding: 0.85rem 0.9rem;
+      padding: 0.8rem 0.875rem;
       color: var(--wrn-color-text);
       background: var(--wrn-color-surface-raised);
       border: 1px solid var(--wrn-color-border);
-      border-radius: 0.9rem;
-      box-shadow: 0 18px 40px color-mix(in srgb, black 28%, transparent);
+      border-radius: var(--wrn-radius);
+      box-shadow: var(--wrn-highlight-edge, none), var(--wrn-shadow-3);
       pointer-events: auto;
       animation: wrn-toast-in 220ms cubic-bezier(0.16, 1, 0.3, 1) both;
     }
@@ -725,7 +725,7 @@ component Toaster {
 
     .wrn-toast__indicator {
       flex: 0 0 auto;
-      width: 0.4rem;
+      width: 3px;
       align-self: stretch;
       border-radius: 999px;
       background: var(--toast-accent, var(--wrn-color-primary));
@@ -784,14 +784,15 @@ component Toaster {
 
     .wrn-toast__title {
       color: var(--wrn-color-text);
-      font-size: 0.85rem;
-      font-weight: 650;
+      font-size: 0.875rem;
+      font-weight: 620;
+      letter-spacing: -0.008em;
       line-height: 1.35;
     }
 
     .wrn-toast__message {
       color: var(--wrn-color-text-muted);
-      font-size: 0.82rem;
+      font-size: 0.8125rem;
       line-height: 1.5;
     }
 
@@ -822,14 +823,16 @@ component Toaster {
       min-height: 1.75rem;
       display: inline-flex;
       align-items: center;
-      padding: 0 0.6rem;
-      color: var(--toast-accent, var(--wrn-color-primary));
-      background: transparent;
-      border: 1px solid color-mix(in srgb, var(--toast-accent, var(--wrn-color-primary)) 40%, transparent);
-      border-radius: 0.55rem;
+      padding: 0 0.625rem;
+      color: var(--wrn-color-text);
+      background: linear-gradient(180deg, var(--wrn-color-surface), var(--wrn-color-surface-soft, var(--wrn-color-surface)));
+      border: 1px solid var(--wrn-color-border);
+      border-bottom-color: var(--wrn-color-border-strong, var(--wrn-color-border));
+      border-radius: calc(var(--wrn-radius-sm) - 2px);
+      box-shadow: var(--wrn-shadow-1);
       font: inherit;
       font-size: 0.78rem;
-      font-weight: 650;
+      font-weight: 600;
       cursor: pointer;
     }
 
@@ -852,14 +855,14 @@ component Toaster {
       color: var(--wrn-color-text-muted);
       background: transparent;
       border: 0;
-      border-radius: 999px;
+      border-radius: calc(var(--wrn-radius-sm) - 2px);
       cursor: pointer;
       transition: color 150ms ease, background 150ms ease;
     }
 
     .wrn-toast__close:hover {
       color: var(--wrn-color-text);
-      background: var(--wrn-color-surface-soft);
+      background: var(--wrn-color-surface-muted, var(--wrn-color-surface-soft));
     }
 
     .wrn-toast__close svg {