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>

examples/component-showcase/app/pages/components/section.wrn

@@ -45,7 +45,7 @@ page SectionDetail {
         </div>
         <form class="playground-controls" data-playground-form>
           <header><div><span>Component props</span><strong>10 controls</strong></div><button type="reset"><span class="icon-[lucide--rotate-ccw] size-4" aria-hidden="true"></span>Reset</button></header>
-          <div class="playground-fields"><label class="playground-field" for="playground-section-id"><span><strong>id</strong><small>string</small></span><input id="playground-section-id" name="pg_id" type="text" value="" /></label><label class="playground-field" for="playground-section-size"><span><strong>size</strong><small>string</small></span><select id="playground-section-size" name="pg_size"><option value="default" selected>default</option><option value="xs">xs</option><option value="sm">sm</option><option value="md">md</option><option value="lg">lg</option><option value="xl">xl</option><option value="icon">icon</option><option value="icon-xs">icon-xs</option><option value="icon-sm">icon-sm</option><option value="icon-lg">icon-lg</option></select></label><label class="playground-field" for="playground-section-color"><span><strong>color</strong><small>string</small></span><select id="playground-section-color" name="pg_color"><option value="primary" selected>primary</option><option value="secondary">secondary</option><option value="success">success</option><option value="warning">warning</option><option value="danger">danger</option><option value="info">info</option></select></label><label class="playground-field" for="playground-section-variant"><span><strong>variant</strong><small>string</small></span><select id="playground-section-variant" name="pg_variant"><option value="default" selected>default</option><option value="soft">soft</option><option value="raised">raised</option><option value="transparent">transparent</option></select></label><label class="playground-field" for="playground-section-spacing"><span><strong>spacing</strong><small>string</small></span><select id="playground-section-spacing" name="pg_spacing"><option value="lg" selected>lg</option><option value="none">none</option><option value="sm">sm</option><option value="md">md</option><option value="xl">xl</option></select></label><label class="playground-field" for="playground-section-maxWidth"><span><strong>max Width</strong><small>string</small></span><select id="playground-section-maxWidth" name="pg_maxWidth"><option value="xl" selected>xl</option><option value="compact">compact</option><option value="lg">lg</option><option value="wide">wide</option><option value="2xl">2xl</option><option value="full">full</option></select></label><label class="playground-toggle" for="playground-section-fullWidth"><span><strong>full Width</strong><small>boolean</small></span><input id="playground-section-fullWidth" name="pg_fullWidth" type="checkbox" value="true" data-playground-boolean /><i aria-hidden="true"></i></label><label class="playground-toggle" for="playground-section-borderTop"><span><strong>border Top</strong><small>boolean</small></span><input id="playground-section-borderTop" name="pg_borderTop" type="checkbox" value="true" data-playground-boolean /><i aria-hidden="true"></i></label><label class="playground-toggle" for="playground-section-borderBottom"><span><strong>border Bottom</strong><small>boolean</small></span><input id="playground-section-borderBottom" name="pg_borderBottom" type="checkbox" value="true" data-playground-boolean /><i aria-hidden="true"></i></label><label class="playground-field" for="playground-section-class"><span><strong>class</strong><small>string</small></span><input id="playground-section-class" name="pg_class" type="text" value="showcase-instance showcase-instance--1" /></label></div>
+          <div class="playground-fields"><label class="playground-field" for="playground-section-id"><span><strong>id</strong><small>string</small></span><input id="playground-section-id" name="pg_id" type="text" value="" /></label><label class="playground-field" for="playground-section-size"><span><strong>size</strong><small>string</small></span><select id="playground-section-size" name="pg_size"><option value="default" selected>default</option><option value="xs">xs</option><option value="sm">sm</option><option value="md">md</option><option value="lg">lg</option><option value="xl">xl</option><option value="icon">icon</option><option value="icon-xs">icon-xs</option><option value="icon-sm">icon-sm</option><option value="icon-lg">icon-lg</option></select></label><label class="playground-field" for="playground-section-color"><span><strong>color</strong><small>string</small></span><select id="playground-section-color" name="pg_color"><option value="primary" selected>primary</option><option value="secondary">secondary</option><option value="success">success</option><option value="warning">warning</option><option value="danger">danger</option><option value="info">info</option></select></label><label class="playground-field" for="playground-section-variant"><span><strong>variant</strong><small>string</small></span><select id="playground-section-variant" name="pg_variant"><option value="default" selected>default</option><option value="soft">soft</option><option value="raised">raised</option><option value="tinted">tinted</option><option value="solid">solid</option><option value="panel">panel</option><option value="grid">grid</option></select></label><label class="playground-field" for="playground-section-spacing"><span><strong>spacing</strong><small>string</small></span><select id="playground-section-spacing" name="pg_spacing"><option value="lg" selected>lg</option><option value="none">none</option><option value="sm">sm</option><option value="md">md</option><option value="xl">xl</option></select></label><label class="playground-field" for="playground-section-maxWidth"><span><strong>max Width</strong><small>string</small></span><select id="playground-section-maxWidth" name="pg_maxWidth"><option value="xl" selected>xl</option><option value="compact">compact</option><option value="lg">lg</option><option value="wide">wide</option><option value="2xl">2xl</option><option value="full">full</option></select></label><label class="playground-toggle" for="playground-section-fullWidth"><span><strong>full Width</strong><small>boolean</small></span><input id="playground-section-fullWidth" name="pg_fullWidth" type="checkbox" value="true" data-playground-boolean /><i aria-hidden="true"></i></label><label class="playground-toggle" for="playground-section-borderTop"><span><strong>border Top</strong><small>boolean</small></span><input id="playground-section-borderTop" name="pg_borderTop" type="checkbox" value="true" data-playground-boolean /><i aria-hidden="true"></i></label><label class="playground-toggle" for="playground-section-borderBottom"><span><strong>border Bottom</strong><small>boolean</small></span><input id="playground-section-borderBottom" name="pg_borderBottom" type="checkbox" value="true" data-playground-boolean /><i aria-hidden="true"></i></label><label class="playground-field" for="playground-section-class"><span><strong>class</strong><small>string</small></span><input id="playground-section-class" name="pg_class" type="text" value="showcase-instance showcase-instance--1" /></label></div>
         </form>
       </div>
     </section>
@@ -61,12 +61,13 @@ page SectionDetail {
           <div id="section-demo-1" class="demo-canvas demo-canvas--1">
             <div class="demo-browser-chrome"><span></span><span></span><span></span><small>Live preview</small></div>
             
-            <div class="demo-render"><Section id="standard-section" size="default" variant="default" spacing="lg" maxWidth="xl" fullWidth="false" borderTop="false" borderBottom="false" class="showcase-instance showcase-instance--1"><div class="showcase-content-block">Standard section content</div></Section></div>
+            <div class="demo-render"><Section id="standard-section" size="default" variant="grid" spacing="lg" maxWidth="xl" fullWidth="false" borderTop="false" borderBottom="false" class="showcase-instance showcase-instance--1"><div class="showcase-content-block">Standard section content</div></Section></div>
           </div>
           <section class="demo-code" aria-label="Standard content section usage">
             <header><span><span class="icon-[lucide--code-2] size-4" aria-hidden="true"></span>Component usage</span><small>.wrn</small></header>
             <pre><code>&lt;Section
-  id="standard-section"&gt;
+  id="standard-section"
+  variant="grid"&gt;
   &lt;div class="showcase-content-block"&gt;Standard section content&lt;/div&gt;
 &lt;/Section&gt;</code></pre>
           </section>
@@ -105,14 +106,14 @@ page SectionDetail {
           <div id="section-demo-3" class="demo-canvas demo-canvas--3">
             <div class="demo-browser-chrome"><span></span><span></span><span></span><small>Live preview</small></div>
             
-            <div class="demo-render"><Section id="full-section" size="lg" variant="raised" maxWidth="full" fullWidth="true" borderTop="true" borderBottom="true" class="showcase-instance showcase-instance--3"><div class="showcase-content-block">Full-width public page section</div></Section></div>
+            <div class="demo-render"><Section id="full-section" size="lg" variant="solid" maxWidth="full" fullWidth="true" borderTop="true" borderBottom="true" class="showcase-instance showcase-instance--3"><div class="showcase-content-block">Full-width public page section</div></Section></div>
           </div>
           <section class="demo-code" aria-label="Full-width surface section usage">
             <header><span><span class="icon-[lucide--code-2] size-4" aria-hidden="true"></span>Component usage</span><small>.wrn</small></header>
             <pre><code>&lt;Section
   id="full-section"
   size="lg"
-  variant="raised"
+  variant="solid"
   maxWidth="full"
   fullWidth="true"
   borderTop="true"