perf(build): budget the runtime on what ships, not on source bytes

The runtime budgets measured raw source, which counts comments -- and the
production build minifies, so comments cost a visitor nothing. The metric
therefore rewarded deleting explanatory comments over writing smaller code,
and could not tell a real feature from a wall of prose.

They now measure the minified output, which is what is actually served:
/__wrnexus/reactive.js is its own file, minified, with an immutable year-long
cache. The reactive runtime is 69684 minified against a 80000 budget, from
175246 raw -- roughly 21kB gzipped, fetched once.

Also fixes two real bugs found while testing the showcase:

  - object-valued props were serialised as a bare {...} attribute, which the
    compiler read as interpolation and tried to parse as JavaScript. That
    returned 500 for /components/navbar. Arrays start with [ and were never
    affected, which is why only object props broke. All 108 pages now render.

  - the runtime walked text nodes inside textarea, script and style, so a
    JSON sample in a textarea was evaluated away.

Navbar styles move out of ui.css into the component, matching the rest of the
navigation group. No declarations changed: 4519 before and after.

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

examples/component-showcase/app/pages/components/page-header.wrn

@@ -183,19 +183,19 @@ page PageHeaderDetail {
         <form class="playground-controls" data-playground-form>
           <header><div><span>Component props</span><strong>25 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-page-header-eyebrow"><span><strong>eyebrow</strong><small>string</small></span><input id="playground-page-header-eyebrow" name="pg_eyebrow" type="text" value="" /></label><label class="playground-field" for="playground-page-header-title"><span><strong>title</strong><small>string</small></span><input id="playground-page-header-title" name="pg_title" type="text" value="Page Header example" /></label><label class="playground-field" for="playground-page-header-description"><span><strong>description</strong><small>string</small></span><input id="playground-page-header-description" name="pg_description" type="text" value="A polished default page header for a modern application." /></label><label class="playground-field" for="playground-page-header-icon"><span><strong>icon</strong><small>string</small></span><input id="playground-page-header-icon" name="pg_icon" type="text" value="" /></label><label class="playground-field" for="playground-page-header-id"><span><strong>id</strong><small>string</small></span><input id="playground-page-header-id" name="pg_id" type="text" value="page-title" /></label><label class="playground-field" for="playground-page-header-align"><span><strong>align</strong><small>string</small></span><select id="playground-page-header-align" name="pg_align"><option value="start" selected>start</option><option value="left">left</option><option value="center">center</option><option value="right">right</option><option value="end">end</option><option value="stretch">stretch</option></select></label><label class="playground-toggle" for="playground-page-header-centered"><span><strong>centered</strong><small>boolean</small></span><input id="playground-page-header-centered" name="pg_centered" type="checkbox" value="true" data-playground-boolean /><i aria-hidden="true"></i></label><label class="playground-toggle" for="playground-page-header-compact"><span><strong>compact</strong><small>boolean</small></span><input id="playground-page-header-compact" name="pg_compact" type="checkbox" value="true" data-playground-boolean /><i aria-hidden="true"></i></label><label class="playground-field" for="playground-page-header-size"><span><strong>size</strong><small>string</small></span><select id="playground-page-header-size" name="pg_size"><option value="default" selected>default</option><option value="small">small</option><option value="large">large</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-page-header-maxWidth"><span><strong>max Width</strong><small>string</small></span><select id="playground-page-header-maxWidth" name="pg_maxWidth"><option value="full" selected>full</option><option value="xl">xl</option><option value="compact">compact</option><option value="lg">lg</option><option value="wide">wide</option><option value="2xl">2xl</option></select></label><label class="playground-toggle" for="playground-page-header-showBreadcrumbs"><span><strong>show Breadcrumbs</strong><small>boolean</small></span><input id="playground-page-header-showBreadcrumbs" name="pg_showBreadcrumbs" type="checkbox" value="true" checked data-playground-boolean /><i aria-hidden="true"></i></label><label class="playground-field" for="playground-page-header-breadcrumbs"><span><strong>breadcrumbs</strong><small>unknown[]</small></span><textarea id="playground-page-header-breadcrumbs" name="pg_breadcrumbs" rows="5" spellcheck="false" data-playground-json>[
-  {
+  &#123;
     "label": "Home",
     "href": "/",
     "icon": "icon-[lucide--house]"
-  },
-  {
+  &#125;,
+  &#123;
     "label": "Components",
     "href": "/base"
-  },
-  {
+  &#125;,
+  &#123;
     "label": "Page header",
     "current": true
-  }
+  &#125;
 ]</textarea><em data-playground-error></em></label><label class="playground-field" for="playground-page-header-breadcrumbParent"><span><strong>breadcrumb Parent</strong><small>string</small></span><input id="playground-page-header-breadcrumbParent" name="pg_breadcrumbParent" type="text" value="" /></label><label class="playground-field" for="playground-page-header-breadcrumbParentHref"><span><strong>breadcrumb Parent Href</strong><small>string</small></span><input id="playground-page-header-breadcrumbParentHref" name="pg_breadcrumbParentHref" type="text" value="#page-header-demo" /></label><label class="playground-field" for="playground-page-header-breadcrumbCurrent"><span><strong>breadcrumb Current</strong><small>string</small></span><input id="playground-page-header-breadcrumbCurrent" name="pg_breadcrumbCurrent" type="text" value="" /></label><label class="playground-field" for="playground-page-header-primaryLabel"><span><strong>primary Label</strong><small>string</small></span><input id="playground-page-header-primaryLabel" name="pg_primaryLabel" type="text" value="Page Header" /></label><label class="playground-field" for="playground-page-header-primaryHref"><span><strong>primary Href</strong><small>string</small></span><input id="playground-page-header-primaryHref" name="pg_primaryHref" type="text" value="#page-header-demo" /></label><label class="playground-field" for="playground-page-header-primaryIcon"><span><strong>primary Icon</strong><small>string</small></span><input id="playground-page-header-primaryIcon" name="pg_primaryIcon" type="text" value="" /></label><label class="playground-field" for="playground-page-header-secondaryLabel"><span><strong>secondary Label</strong><small>string</small></span><input id="playground-page-header-secondaryLabel" name="pg_secondaryLabel" type="text" value="Page Header" /></label><label class="playground-field" for="playground-page-header-secondaryHref"><span><strong>secondary Href</strong><small>string</small></span><input id="playground-page-header-secondaryHref" name="pg_secondaryHref" type="text" value="#page-header-demo" /></label><label class="playground-field" for="playground-page-header-secondaryIcon"><span><strong>secondary Icon</strong><small>string</small></span><input id="playground-page-header-secondaryIcon" name="pg_secondaryIcon" type="text" value="" /></label><label class="playground-field" for="playground-page-header-color"><span><strong>color</strong><small>string</small></span><select id="playground-page-header-color" name="pg_color"><option value="primary" selected>primary</option><option value="secondary">secondary</option><option value="info">info</option><option value="success">success</option><option value="warning">warning</option><option value="danger">danger</option></select></label><label class="playground-field" for="playground-page-header-variant"><span><strong>variant</strong><small>string</small></span><select id="playground-page-header-variant" name="pg_variant"><option value="default" selected>default</option><option value="minimal">minimal</option><option value="soft">soft</option><option value="raised">raised</option><option value="tinted">tinted</option><option value="solid">solid</option></select></label><label class="playground-toggle" for="playground-page-header-borderBottom"><span><strong>border Bottom</strong><small>boolean</small></span><input id="playground-page-header-borderBottom" name="pg_borderBottom" type="checkbox" value="true" checked data-playground-boolean /><i aria-hidden="true"></i></label><label class="playground-field" for="playground-page-header-class"><span><strong>class</strong><small>string</small></span><input id="playground-page-header-class" name="pg_class" type="text" value="showcase-instance showcase-instance--1" /></label></div>
         </form>
       </div>