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/combo-box.wrn

@@ -113,37 +113,37 @@ page ComboBoxDetail {
         <form class="playground-controls" data-playground-form>
           <header><div><span>Component props</span><strong>41 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-combo-box-size"><span><strong>size</strong><small>string</small></span><select id="playground-combo-box-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-combo-box-color"><span><strong>color</strong><small>string</small></span><select id="playground-combo-box-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-combo-box-label"><span><strong>label</strong><small>string</small></span><input id="playground-combo-box-label" name="pg_label" type="text" value="Default autocomplete" /></label><label class="playground-field" for="playground-combo-box-name"><span><strong>name</strong><small>string</small></span><input id="playground-combo-box-name" name="pg_name" type="text" value="combobox-1" /></label><label class="playground-field" for="playground-combo-box-value"><span><strong>value</strong><small>string</small></span><input id="playground-combo-box-value" name="pg_value" type="text" value="" /></label><label class="playground-field" for="playground-combo-box-options"><span><strong>options</strong><small>unknown[]</small></span><textarea id="playground-combo-box-options" name="pg_options" rows="5" spellcheck="false" data-playground-json>[
-  {
+  &#123;
     "value": "design",
     "label": "Design",
     "description": "Product and visual design",
     "icon": "icon-[lucide--palette]",
     "color": "#8b5cf6",
     "avatar": "/showcase-images/avatar-design.svg"
-  },
-  {
+  &#125;,
+  &#123;
     "value": "engineering",
     "label": "Engineering",
     "description": "Platform and application engineering",
     "icon": "icon-[lucide--code-2]",
     "color": "#0ea5e9",
     "avatar": "/showcase-images/avatar-engineering.svg"
-  },
-  {
+  &#125;,
+  &#123;
     "value": "growth",
     "label": "Growth",
     "description": "Marketing and customer growth",
     "icon": "icon-[lucide--trending-up]",
     "color": "#10b981",
     "avatar": "/showcase-images/avatar-growth.svg"
-  },
-  {
+  &#125;,
+  &#123;
     "value": "support",
     "label": "Support",
     "description": "Customer operations",
     "icon": "icon-[lucide--life-buoy]",
     "color": "#f59e0b"
-  }
+  &#125;
 ]</textarea><em data-playground-error></em></label><label class="playground-field" for="playground-combo-box-groups"><span><strong>groups</strong><small>unknown[]</small></span><textarea id="playground-combo-box-groups" name="pg_groups" rows="5" spellcheck="false" data-playground-json>[]</textarea><em data-playground-error></em></label><label class="playground-field" for="playground-combo-box-placeholder"><span><strong>placeholder</strong><small>string</small></span><input id="playground-combo-box-placeholder" name="pg_placeholder" type="text" value="Search teams" /></label><label class="playground-field" for="playground-combo-box-searchPlaceholder"><span><strong>search Placeholder</strong><small>string</small></span><input id="playground-combo-box-searchPlaceholder" name="pg_searchPlaceholder" type="text" value="Start typing…" /></label><label class="playground-toggle" for="playground-combo-box-clearable"><span><strong>clearable</strong><small>boolean</small></span><input id="playground-combo-box-clearable" name="pg_clearable" type="checkbox" value="true" checked data-playground-boolean /><i aria-hidden="true"></i></label><label class="playground-toggle" for="playground-combo-box-allowCustomValue"><span><strong>allow Custom Value</strong><small>boolean</small></span><input id="playground-combo-box-allowCustomValue" name="pg_allowCustomValue" type="checkbox" value="true" data-playground-boolean /><i aria-hidden="true"></i></label><label class="playground-toggle" for="playground-combo-box-disabled"><span><strong>disabled</strong><small>boolean</small></span><input id="playground-combo-box-disabled" name="pg_disabled" type="checkbox" value="true" data-playground-boolean /><i aria-hidden="true"></i></label><label class="playground-toggle" for="playground-combo-box-required"><span><strong>required</strong><small>boolean</small></span><input id="playground-combo-box-required" name="pg_required" type="checkbox" value="true" data-playground-boolean /><i aria-hidden="true"></i></label><label class="playground-toggle" for="playground-combo-box-invalid"><span><strong>invalid</strong><small>boolean</small></span><input id="playground-combo-box-invalid" name="pg_invalid" type="checkbox" value="true" data-playground-boolean /><i aria-hidden="true"></i></label><label class="playground-field" for="playground-combo-box-validationMessage"><span><strong>validation Message</strong><small>string</small></span><input id="playground-combo-box-validationMessage" name="pg_validationMessage" type="text" value="" /></label><label class="playground-field" for="playground-combo-box-helpText"><span><strong>help Text</strong><small>string</small></span><input id="playground-combo-box-helpText" name="pg_helpText" type="text" value="" /></label><label class="playground-toggle" for="playground-combo-box-loading"><span><strong>loading</strong><small>boolean</small></span><input id="playground-combo-box-loading" name="pg_loading" type="checkbox" value="true" data-playground-boolean /><i aria-hidden="true"></i></label><label class="playground-field" for="playground-combo-box-loadingLabel"><span><strong>loading Label</strong><small>string</small></span><input id="playground-combo-box-loadingLabel" name="pg_loadingLabel" type="text" value="Loading suggestions…" /></label><label class="playground-field" for="playground-combo-box-emptyLabel"><span><strong>empty Label</strong><small>string</small></span><input id="playground-combo-box-emptyLabel" name="pg_emptyLabel" type="text" value="No matching options" /></label><label class="playground-field" for="playground-combo-box-clearLabel"><span><strong>clear Label</strong><small>string</small></span><input id="playground-combo-box-clearLabel" name="pg_clearLabel" type="text" value="Clear value" /></label><label class="playground-field" for="playground-combo-box-toggleLabel"><span><strong>toggle Label</strong><small>string</small></span><input id="playground-combo-box-toggleLabel" name="pg_toggleLabel" type="text" value="Toggle suggestions" /></label><label class="playground-field" for="playground-combo-box-searchMode"><span><strong>search Mode</strong><small>string</small></span><input id="playground-combo-box-searchMode" name="pg_searchMode" type="text" value="contains" /></label><label class="playground-field" for="playground-combo-box-searchFields"><span><strong>search Fields</strong><small>string</small></span><input id="playground-combo-box-searchFields" name="pg_searchFields" type="text" value="label,description" /></label><label class="playground-field" for="playground-combo-box-minSearchLength"><span><strong>min Search Length</strong><small>number</small></span><input id="playground-combo-box-minSearchLength" name="pg_minSearchLength" type="number" value="0" /></label><label class="playground-field" for="playground-combo-box-searchResultLimit"><span><strong>search Result Limit</strong><small>number</small></span><input id="playground-combo-box-searchResultLimit" name="pg_searchResultLimitLine truncated
         </form>
       </div>