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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/overlays.wrn

@@ -26,11 +26,11 @@ page OverlaysShowcase {
       <article class="catalog-card" data-interactive-preview="true">
         <div class="catalog-card-preview">
           <div class="catalog-card-glow" aria-hidden="true"></div>
-          <div class="catalog-card-stage"><Drawer open="false" defaultOpen="false" placement="right" size="md" variant="default" title="Citizen service details" description="Review supporting information without leaving the current page." icon="icon-[lucide--panel-right]" label="Drawer" closeLabel="Drawer" showClose="true" closeOnBackdrop="true" closeOnEscape="true" overlay="true" scrollable="true" triggerLabel="Open drawer" triggerIcon="icon-[lucide--panel-right-open]" class="showcase-instance showcase-instance--1"><div class="showcase-overlay-content"><p>Place forms, filters, navigation, or record details here.</p></div><div data-slot="footer"><button type="button" class="showcase-action showcase-action--primary">Save changes</button></div></Drawer><p class="catalog-interaction-hint"><span class="icon-[lucide--mouse-pointer-click] size-4" aria-hidden="true"></span>Click the trigger to open the drawer</p></div>
+          <div class="catalog-card-stage"><Drawer open="false" defaultOpen="false" placement="right" size="md" variant="default" title="Citizen service details" description="Review supporting information without leaving the current page." icon="icon-[lucide--panel-right]" label="Drawer" closeLabel="Drawer" showClose="true" closeOnBackdrop="true" closeOnEscape="true" duration="260" overlay="true" scrollable="true" triggerLabel="Open drawer" triggerIcon="icon-[lucide--panel-right-open]" class="showcase-instance showcase-instance--1"><div class="showcase-overlay-content"><p>Place forms, filters, navigation, or record details here.</p></div><div data-slot="footer"><button type="button" class="showcase-action showcase-action--primary">Save changes</button></div></Drawer><p class="catalog-interaction-hint"><span class="icon-[lucide--mouse-pointer-click] size-4" aria-hidden="true"></span>Click the trigger to open the drawer</p></div>
         </div>
         <div class="catalog-card-body">
           <div><span class="catalog-card-category">Overlays</span><h2>Drawer</h2><p>Present responsive modal side or bottom content with focus management, backdrop behavior, slots, and close events.</p></div>
-          <div class="catalog-card-footer"><span>19 props · 4 slots</span><a href="/components/drawer">Explore component <span aria-hidden="true">→</span></a></div>
+          <div class="catalog-card-footer"><span>20 props · 4 slots</span><a href="/components/drawer">Explore component <span aria-hidden="true">→</span></a></div>
         </div>
       </article>
       <article class="catalog-card" data-interactive-preview="true">
@@ -50,7 +50,7 @@ page OverlaysShowcase {
         </div>
         <div class="catalog-card-body">
           <div><span class="catalog-card-category">Overlays</span><h2>Modal</h2><p>Present an accessible modal dialog with focus management, confirmation, cancellation, slots, and responsive sizing.</p></div>
-          <div class="catalog-card-footer"><span>28 props · 4 slots</span><a href="/components/modal">Explore component <span aria-hidden="true">→</span></a></div>
+          <div class="catalog-card-footer"><span>29 props · 4 slots</span><a href="/components/modal">Explore component <span aria-hidden="true">→</span></a></div>
         </div>
       </article>
       <article class="catalog-card" data-interactive-preview="true">