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/context-menu.wrn

@@ -173,27 +173,27 @@ page ContextMenuDetail {
         <form class="playground-controls" data-playground-form>
           <header><div><span>Component props</span><strong>18 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-context-menu-items"><span><strong>items</strong><small>unknown[]</small></span><textarea id="playground-context-menu-items" name="pg_items" rows="5" spellcheck="false" data-playground-json>[
-  {
+  &#123;
     "label": "Open dashboard",
     "description": "View the operational workspace",
     "value": "dashboard",
     "icon": "icon-[lucide--layout-dashboard]"
-  },
-  {
+  &#125;,
+  &#123;
     "label": "Share record",
     "value": "share",
     "icon": "icon-[lucide--share-2]",
     "shortcut": "Ctrl S"
-  },
-  {
+  &#125;,
+  &#123;
     "type": "divider"
-  },
-  {
+  &#125;,
+  &#123;
     "label": "Delete record",
     "value": "delete",
     "icon": "icon-[lucide--trash-2]",
     "danger": true
-  }
+  &#125;
 ]</textarea><em data-playground-error></em></label><label class="playground-toggle" for="playground-context-menu-open"><span><strong>open</strong><small>boolean</small></span><input id="playground-context-menu-open" name="pg_open" type="checkbox" value="true" data-playground-boolean /><i aria-hidden="true"></i></label><label class="playground-toggle" for="playground-context-menu-defaultOpen"><span><strong>default Open</strong><small>boolean</small></span><input id="playground-context-menu-defaultOpen" name="pg_defaultOpen" type="checkbox" value="true" data-playground-boolean /><i aria-hidden="true"></i></label><label class="playground-field" for="playground-context-menu-trigger"><span><strong>trigger</strong><small>string</small></span><select id="playground-context-menu-trigger" name="pg_trigger"><option value="click" selected>click</option><option value="contextmenu">contextmenu</option><option value="both">both</option><option value="manual">manual</option><option value="hover">hover</option><option value="focus">focus</option></select></label><label class="playground-field" for="playground-context-menu-placement"><span><strong>placement</strong><small>string</small></span><select id="playground-context-menu-placement" name="pg_placement"><option value="pointer" selected>pointer</option><option value="top-start">top-start</option><option value="top-end">top-end</option><option value="bottom-start">bottom-start</option><option value="bottom-end">bottom-end</option><option value="top">top</option><option value="right">right</option><option value="right-start">right-start</option><option value="right-end">right-end</option><option value="bottom">bottom</option><option value="left">left</option><option value="left-start">left-start</option><option value="left-end">left-end</option></select></label><label class="playground-field" for="playground-context-menu-align"><span><strong>align</strong><small>string</small></span><select id="playground-context-menu-align" name="pg_align"><option value="start" selected>start</option><option value="center">center</option><option value="end">end</option><option value="left">left</option><option value="right">right</option><option value="stretch">stretch</option></select></label><label class="playground-field" for="playground-context-menu-size"><span><strong>size</strong><small>string</small></span><select id="playground-context-menu-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-context-menu-color"><span><strong>color</strong><small>string</small></span><select id="playground-context-menu-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-context-menu-variant"><span><strong>variant</strong><small>string</small></span><select id="playground-context-menu-variant" name="pg_variant"><option value="raised" selected>raised</option><option value="default">default</option><option value="soft">soft</option><option value="outline">outline</option></select></label><label class="playground-field" for="playground-context-menu-title"><span><strong>title</strong><small>string</small></span><input id="playground-context-menu-title" name="pg_title" type="text" value="Context Menu example" /></label><label class="playground-field" for="playground-context-menu-description"><span><strong>description</strong><small>string</small></span><input id="playground-context-menu-description" name="pg_description" type="text" value="A polished default context menu for a modern application." /></label><label class="playground-field" for="playground-context-menu-label"><span><strong>label</strong><small>string</small></span><input id="playground-context-menu-label" name="pg_label" type="text" value="Context Menu" /></label><label class="playground-toggle" for="playground-context-menu-closeOnSelect"><span><strong>close On Select</strong><small>boolean</small></span><input id="playground-context-menu-closeOnSelect" name="pg_closeOnSelect" type="checkbox" value="true" checked data-playground-boolean /><i aria-hidden="true"></i></label><label class="playground-toggle" for="playground-context-menu-closeOnOutside"><span><strong>close On Outside</strong><small>boolean</small></span><input id="playground-context-menu-closeOnOutside" name="pg_closeOnOutside" type="checkbox" value="true" checked data-playground-boolean /><i aria-hidden="true"></i></labLine truncated
         </form>
       </div>