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/Section.wrn

@@ -112,6 +112,76 @@ component Section {
       --section-ink: var(--wrn-color-on-danger);
     }
 
+    .wrn-section[data-variant="solid"][data-color="secondary"] {
+      --section-tint: var(--wrn-color-secondary);
+      --section-ink: var(--wrn-color-on-secondary, #fff);
+    }
+
+    .wrn-section[data-variant="solid"][data-color="success"] {
+      --section-tint: var(--wrn-color-success);
+      --section-ink: #fff;
+    }
+
+    .wrn-section[data-variant="solid"][data-color="info"] {
+      --section-tint: var(--wrn-color-info);
+      --section-ink: #fff;
+    }
+
+    .wrn-section[data-variant="solid"][data-color="warning"] {
+      --section-tint: var(--wrn-color-warning);
+      --section-ink: #fff;
+    }
+
+    .wrn-section[data-spacing="none"] {
+      padding-block: 0;
+    }
+
+    /* Soft and raised read as bands: hairlines mark where they start and end. */
+    .wrn-section[data-variant="soft"],
+    .wrn-section[data-variant="tinted"] {
+      box-shadow:
+        inset 0 1px 0 color-mix(in srgb, var(--wrn-color-border) 70%, transparent),
+        inset 0 -1px 0 color-mix(in srgb, var(--wrn-color-border) 70%, transparent);
+    }
+
+    .wrn-section[data-variant="raised"] {
+      box-shadow:
+        inset 0 1px 0 var(--wrn-color-border),
+        inset 0 -1px 0 var(--wrn-color-border),
+        0 12px 32px -20px rgb(0 0 0 / 0.25);
+    }
+
+    /* Solid bands carry a faint dot texture so large fills do not look flat. */
+    .wrn-section[data-variant="solid"] {
+      background:
+        radial-gradient(circle at 1px 1px, rgb(255 255 255 / 0.12) 1px, transparent 0) 0 0 / 20px 20px,
+        var(--section-tint);
+    }
+
+    /* Panel: the section becomes a framed, rounded band inside the page gutter. */
+    .wrn-section[data-variant="panel"] {
+      --section-tint: var(--wrn-color-surface);
+      width: auto;
+      margin-inline: clamp(0.75rem, 3vw, 2rem);
+      border: 1px solid var(--wrn-color-border);
+      border-radius: var(--wrn-radius-lg, 1rem);
+      box-shadow: var(--wrn-shadow-1);
+    }
+
+    /* Grid: a blueprint backdrop that fades out toward the edges. */
+    .wrn-section[data-variant="grid"]::before {
+      position: absolute;
+      z-index: -1;
+      inset: 0;
+      background:
+        linear-gradient(var(--wrn-color-border) 1px, transparent 1px) 0 0 / 32px 32px,
+        linear-gradient(90deg, var(--wrn-color-border) 1px, transparent 1px) 0 0 / 32px 32px;
+      content: "";
+      -webkit-mask-image: radial-gradient(ellipse at center, #000 40%, transparent 85%);
+      mask-image: radial-gradient(ellipse at center, #000 40%, transparent 85%);
+      pointer-events: none;
+    }
+
     .wrn-section[data-border-top="true"] {
       border-top: 1px solid var(--wrn-color-border);
     }