refactor(ui): migrate the layout components off Tailwind utilities

Container, Columns, Grid, Divider, Image, Link, Typography and Kbd were built
from utility classes and class: conditionals. That works only where Tailwind
is present, and every variant cost a dozen conditional lines -- Divider spent
eleven of them saying which token to paint the rule.

They now carry wire-* classes with a local style block, and variants are data
attributes the style block selects on. Divider went from eleven conditionals
to five rules, and Typography lost thirteen.

Behaviour is preserved rather than improved on. Container keeps columns and
gap even though a container is not really a grid, because applications depend
on them, and its columns default stays 2: the redesign contract test caught
that changing it would silently reflow every Container already published.

Additive only: Grid gains minItemWidth for an auto-fit track, Divider gains
dashed and dotted variants, Image gains fit, and Link gains underline.

Verified in a browser rather than by eye, since the pane cannot screenshot:
track counts match the declared columns at desktop and collapse correctly
below each breakpoint.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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

@@ -8,6 +8,7 @@ page ImageDetail {
   state playground_width = ctx.url.searchParams.get("pg_width") ?? ""
   state playground_height = ctx.url.searchParams.get("pg_height") ?? ""
   state playground_loading = ctx.url.searchParams.get("pg_loading") ?? "lazy"
+  state playground_fit = ctx.url.searchParams.get("pg_fit") ?? "cover"
   state playground_rounded = (ctx.url.searchParams.get("pg_rounded") ?? "false") === "true"
   state playground_class = ctx.url.searchParams.get("pg_class") ?? "showcase-instance showcase-instance--1"
   seo {
@@ -23,7 +24,7 @@ page ImageDetail {
         <span class="showcase-eyebrow">Layout component</span>
         <h1>Image</h1>
         <p>Render a responsive image with explicit dimensions, loading behavior, alternative text, sizing, and rounded treatment.</p>
-        <div class="detail-badges"><span>9 props</span><span>1 slots</span><span>0 outputs</span><span>Theme ready</span><span>Responsive</span></div>
+        <div class="detail-badges"><span>10 props</span><span>1 slots</span><span>0 outputs</span><span>Theme ready</span><span>Responsive</span></div>
       </div>
       <div class="detail-hero-icon"><span class="icon-[lucide--component] size-10" aria-hidden="true"></span></div>
     </header>
@@ -32,7 +33,7 @@ page ImageDetail {
       <div class="playground-workbench">
         <div class="playground-preview">
           <div class="demo-browser-chrome"><span></span><span></span><span></span><small>Live preview</small></div>
-          <div class="playground-preview-source" data-playground-preview><Image size='{playground_size}' color='{playground_color}' src='{playground_src}' alt='{playground_alt}' width='{playground_width}' height='{playground_height}' loading='{playground_loading}' rounded='{playground_rounded}' class='{playground_class}' /></div>
+          <div class="playground-preview-source" data-playground-preview><Image size='{playground_size}' color='{playground_color}' src='{playground_src}' alt='{playground_alt}' width='{playground_width}' height='{playground_height}' loading='{playground_loading}' fit='{playground_fit}' rounded='{playground_rounded}' class='{playground_class}' /></div>
           <section class="playground-code" aria-label="Current component code">
             <header><span><span class="icon-[lucide--code-2] size-4" aria-hidden="true"></span>Component code</span><button type="button" data-playground-copy><span class="icon-[lucide--copy] size-4" aria-hidden="true"></span>Copy</button></header>
             <pre><code data-playground-code>&lt;Image /&gt;</code></pre>
@@ -41,8 +42,8 @@ page ImageDetail {
           
         </div>
         <form class="playground-controls" data-playground-form>
-          <header><div><span>Component props</span><strong>9 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-image-size"><span><strong>size</strong><small>string</small></span><select id="playground-image-size" name="pg_size"><option value="default" selected>default</option><option value="sm">sm</option><option value="lg">lg</option><option value="xs">xs</option><option value="md">md</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-image-color"><span><strong>color</strong><small>string</small></span><select id="playground-image-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-image-src"><span><strong>src</strong><small>string</small></span><input id="playground-image-src" name="pg_src" type="text" value="" /></label><label class="playground-field" for="playground-image-alt"><span><strong>alt</strong><small>string</small></span><input id="playground-image-alt" name="pg_alt" type="text" value="" /></label><label class="playground-field" for="playground-image-width"><span><strong>width</strong><small>string</small></span><select id="playground-image-width" name="pg_width"><option value="" selected>Auto / default</option><option value="default">default</option><option value="compact">compact</option><option value="wide">wide</option><option value="full">full</option></select></label><label class="playground-field" for="playground-image-height"><span><strong>height</strong><small>string</small></span><input id="playground-image-height" name="pg_height" type="text" value="" /></label><label class="playground-field" for="playground-image-loading"><span><strong>loading</strong><small>string</small></span><select id="playground-image-loading" name="pg_loading"><option value="lazy" selected>lazy</option><option value="eager">eager</option></select></label><label class="playground-toggle" for="playground-image-rounded"><span><strong>rounded</strong><small>boolean</small></span><input id="playground-image-rounded" name="pg_rounded" type="checkbox" value="true" data-playground-boolean /><i aria-hidden="true"></i></label><label class="playground-field" for="playground-image-class"><span><strong>class</strong><small>string</small></span><input id="playground-image-class" name="pg_class" type="text" value="showcase-instance showcase-instance--1" /></label></div>
+          <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-image-size"><span><strong>size</strong><small>string</small></span><select id="playground-image-size" name="pg_size"><option value="default" selected>default</option><option value="sm">sm</option><option value="lg">lg</option><option value="xs">xs</option><option value="md">md</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-image-color"><span><strong>color</strong><small>string</small></span><select id="playground-image-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-image-src"><span><strong>src</strong><small>string</small></span><input id="playground-image-src" name="pg_src" type="text" value="" /></label><label class="playground-field" for="playground-image-alt"><span><strong>alt</strong><small>string</small></span><input id="playground-image-alt" name="pg_alt" type="text" value="" /></label><label class="playground-field" for="playground-image-width"><span><strong>width</strong><small>string</small></span><select id="playground-image-width" name="pg_width"><option value="" selected>Auto / default</option><option value="default">default</option><option value="compact">compact</option><option value="wide">wide</option><option value="full">full</option></select></label><label class="playground-field" for="playground-image-height"><span><strong>height</strong><small>string</small></span><input id="playground-image-height" name="pg_height" type="text" value="" /></label><label class="playground-field" for="playground-image-loading"><span><strong>loading</strong><small>string</small></span><select id="playground-image-loading" name="pg_loading"><option value="lazy" selected>lazy</option><option value="eager">eager</option></select></label><label class="playground-field" for="playground-image-fit"><span><strong>fit</strong><small>string</small></span><input id="playground-image-fit" name="pg_fit" type="text" value="cover" /></label><label class="playground-toggle" for="playground-image-rounded"><span><strong>rounded</strong><small>boolean</small></span><input id="playground-image-rounded" name="pg_rounded" type="checkbox" value="true" data-playground-boolean /><i aria-hidden="true"></i></label><label class="playground-field" for="playground-image-class"><span><strong>class</strong><small>string</small></span><input id="playground-image-class" name="pg_class" type="text" value="showcase-instance showcase-instance--1" /></label></div>
         </form>
       </div>
     </section>
@@ -121,7 +122,7 @@ page ImageDetail {
         </div>
       </article></div></section>
         
-        <section id="api" class="detail-section"><div class="detail-section-heading"><span>Component API</span><h2>Props and configuration</h2><p>All content and behavior shown above is supplied through these props and slots.</p></div><div class="docs-table-wrap"><table class="docs-table"><thead><tr><th>Prop</th><th>Type</th><th>Default</th><th>Required</th></tr></thead><tbody><tr><td><code>size</code></td><td>string</td><td><code>"default"</code></td><td>No</td></tr><tr><td><code>color</code></td><td>string</td><td><code>"primary"</code></td><td>No</td></tr><tr><td><code>src</code></td><td>string</td><td><code>""</code></td><td>No</td></tr><tr><td><code>alt</code></td><td>string</td><td><code>""</code></td><td>No</td></tr><tr><td><code>width</code></td><td>string</td><td><code>""</code></td><td>No</td></tr><tr><td><code>height</code></td><td>string</td><td><code>""</code></td><td>No</td></tr><tr><td><code>loading</code></td><td>string</td><td><code>"lazy"</code></td><td>No</td></tr><tr><td><code>rounded</code></td><td>boolean</td><td><code>false</code></td><td>No</td></tr><tr><td><code>class</code></td><td>string</td><td><code>""</code></td><td>No</td></tr></tbody></table></div></section>
+        <section id="api" class="detail-section"><div class="detail-section-heading"><span>Component API</span><h2>Props and configuration</h2><p>All content and behavior shown above is supplied through these props and slots.</p></div><div class="docs-table-wrap"><table class="docs-table"><thead><tr><th>Prop</th><th>Type</th><th>Default</th><th>Required</th></tr></thead><tbody><tr><td><code>size</code></td><td>string</td><td><code>"default"</code></td><td>No</td></tr><tr><td><code>color</code></td><td>string</td><td><code>"primary"</code></td><td>No</td></tr><tr><td><code>src</code></td><td>string</td><td><code>""</code></td><td>No</td></tr><tr><td><code>alt</code></td><td>string</td><td><code>""</code></td><td>No</td></tr><tr><td><code>width</code></td><td>string</td><td><code>""</code></td><td>No</td></tr><tr><td><code>height</code></td><td>string</td><td><code>""</code></td><td>No</td></tr><tr><td><code>loading</code></td><td>string</td><td><code>"lazy"</code></td><td>No</td></tr><tr><td><code>fit</code></td><td>string</td><td><code>"cover"</code></td><td>No</td></tr><tr><td><code>rounded</code></td><td>boolean</td><td><code>false</code></td><td>No</td></tr><tr><td><code>class</code></td><td>string</td><td><code>""</code></td><td>No</td></tr></tbody></table></div></section>
       </main>
       <aside class="detail-aside">
         <div class="detail-toc"><strong>On this page</strong><a href="#playground">Playground</a><a href="#image-demo-1">Responsive content image</a><a href="#image-demo-2">Rounded thumbnail</a><a href="#image-demo-3">Eager hero image</a><a href="#api">Props API</a></div>