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feat(ui): add DataTable and Toaster, drop the legacy Table, fix overlay dialogs

DataTable replaces the 20-line Table scaffold entirely: columns, sorting,
filtering, pagination, selection, bulk actions, comparison layout, sticky
first column, custom HTML cells, and a remote source driven by a `request`
output rather than a function prop (props travel as HTML attributes, so a
function arrives as its own source text).

Toaster replaces the hand-rolled status div: tone icons, actions, hover
pause/resume and a progress bar.

Overlays audit -- Modal and Drawer declared aria-modal="true" but nothing
ever moved focus into the panel, so the @keydown handler on their root
never ran and closeOnEscape did nothing. Focus, focus restore, a Tab trap
and a body scroll lock now live in the reactive runtime, shared by both.

ContextMenu placed pointer menus by subtracting a guessed 340x420 from the
viewport, which pushed every menu that was not that size away from the
pointer; it now positions at the pointer and lets the anchored clamp pull
it back once it can be measured.

The reactive runtime size budget moves 150k -> 175k to cover anchored
overlays, dialog behaviour, the toaster and the DataTable client half.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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examples/component-showcase/app/pages/core.wrn

@@ -3,14 +3,14 @@ page CoreShowcase {
   layout = "showcase"
   seo {
     title = "Core components"
-    description = "4 core components from @wrnexus/ui."
+    description = "5 core components from @wrnexus/ui."
   }
   view {
     <header class="showcase-hero showcase-hero--category">
       <span class="showcase-eyebrow">Component category</span>
       <h1 class="showcase-title">Core</h1>
-      <p class="showcase-description">4 unique, responsive, theme-aware components. Open a component to inspect multiple live configurations and its complete props API.</p>
-      <div class="category-meta"><span>4 components</span><span>Multiple use cases</span><span>12 live configurations</span></div>
+      <p class="showcase-description">5 unique, responsive, theme-aware components. Open a component to inspect multiple live configurations and its complete props API.</p>
+      <div class="category-meta"><span>5 components</span><span>Multiple use cases</span><span>13 live configurations</span></div>
     </header>
     <div class="catalog-grid">
       <article class="catalog-card" data-interactive-preview="false">
@@ -52,6 +52,16 @@ page CoreShowcase {
           <div><span class="catalog-card-category">Core</span><h2>Preference Switcher</h2><p>Reusable preference switcher component.</p></div>
           <div class="catalog-card-footer"><span>9 props · 0 slots</span><a href="/components/preference-switcher">Explore component <span aria-hidden="true">→</span></a></div>
         </div>
+      </article>
+      <article class="catalog-card" data-interactive-preview="false">
+        <div class="catalog-card-preview">
+          <div class="catalog-card-glow" aria-hidden="true"></div>
+          <div class="catalog-card-stage"><Toaster size="default" position="bottom-right" duration="4500" max="4" pauseOnHover="true" showIcon="true" closable="true" showProgress="true" closeLabel="Toaster" class="showcase-instance showcase-instance--1" /></div>
+        </div>
+        <div class="catalog-card-body">
+          <div><span class="catalog-card-category">Core</span><h2>Toaster</h2><p>Reusable toaster component.</p></div>
+          <div class="catalog-card-footer"><span>15 props · 0 slots</span><a href="/components/toaster">Explore component <span aria-hidden="true">→</span></a></div>
+        </div>
       </article></div>
   }
 }