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/hero-actions.wrn

@@ -152,18 +152,18 @@ page HeroActionsDetail {
         <form class="playground-controls" data-playground-form>
           <header><div><span>Component props</span><strong>8 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-hero-actions-actions"><span><strong>actions</strong><small>unknown[]</small></span><textarea id="playground-hero-actions-actions" name="pg_actions" rows="5" spellcheck="false" data-playground-json>[
-  {
+  &#123;
     "label": "Browse components",
     "href": "#components",
     "icon": "icon-[lucide--blocks]",
     "variant": "primary"
-  },
-  {
+  &#125;,
+  &#123;
     "label": "View metrics",
     "href": "#metrics",
     "icon": "icon-[lucide--chart-no-axes-column-increasing]",
     "variant": "outline"
-  }
+  &#125;
 ]</textarea><em data-playground-error></em></label><label class="playground-field" for="playground-hero-actions-align"><span><strong>align</strong><small>string</small></span><select id="playground-hero-actions-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-field" for="playground-hero-actions-orientation"><span><strong>orientation</strong><small>string</small></span><select id="playground-hero-actions-orientation" name="pg_orientation"><option value="horizontal" selected>horizontal</option><option value="vertical">vertical</option></select></label><label class="playground-toggle" for="playground-hero-actions-stackOnMobile"><span><strong>stack On Mobile</strong><small>boolean</small></span><input id="playground-hero-actions-stackOnMobile" name="pg_stackOnMobile" type="checkbox" value="true" checked data-playground-boolean /><i aria-hidden="true"></i></label><label class="playground-toggle" for="playground-hero-actions-fullWidthMobile"><span><strong>full Width Mobile</strong><small>boolean</small></span><input id="playground-hero-actions-fullWidthMobile" name="pg_fullWidthMobile" type="checkbox" value="true" checked data-playground-boolean /><i aria-hidden="true"></i></label><label class="playground-field" for="playground-hero-actions-size"><span><strong>size</strong><small>string</small></span><select id="playground-hero-actions-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-hero-actions-color"><span><strong>color</strong><small>string</small></span><select id="playground-hero-actions-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-hero-actions-class"><span><strong>class</strong><small>string</small></span><input id="playground-hero-actions-class" name="pg_class" type="text" value="showcase-instance showcase-instance--1" /></label></div>
         </form>
       </div>