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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/layouts/showcase.wrn

@@ -39,7 +39,7 @@ layout Showcase {
         </section>
         <section class="docs-directory-group">
           <a class="docs-directory-heading" href="/core">Core</a>
-          <div><a data-docs-component-link href="/components/auth-form">Auth Form</a><a data-docs-component-link href="/components/auth-split-layout">Auth Split Layout</a><a data-docs-component-link href="/components/portal-dashboard">Portal Dashboard</a><a data-docs-component-link href="/components/preference-switcher">Preference Switcher</a></div>
+          <div><a data-docs-component-link href="/components/auth-form">Auth Form</a><a data-docs-component-link href="/components/auth-split-layout">Auth Split Layout</a><a data-docs-component-link href="/components/portal-dashboard">Portal Dashboard</a><a data-docs-component-link href="/components/preference-switcher">Preference Switcher</a><a data-docs-component-link href="/components/toaster">Toaster</a></div>
         </section>
         <section class="docs-directory-group">
           <a class="docs-directory-heading" href="/data">Data</a>
@@ -51,7 +51,7 @@ layout Showcase {
         </section>
         <section class="docs-directory-group">
           <a class="docs-directory-heading" href="/integrations">Integrations</a>
-          <div><a data-docs-component-link href="/components/advanced-date-picker">Advanced Date Picker</a><a data-docs-component-link href="/components/advanced-range-slider">Advanced Range Slider</a><a data-docs-component-link href="/components/chart">Chart</a><a data-docs-component-link href="/components/clipboard">Clipboard</a><a data-docs-component-link href="/components/confetti">Confetti</a><a data-docs-component-link href="/components/data-map">Data Map</a><a data-docs-component-link href="/components/data-table">Data Table</a><a data-docs-component-link href="/components/drag-and-drop">Drag And Drop</a><a data-docs-component-link href="/components/file-upload">File Upload</a><a data-docs-component-link href="/components/map">Map</a><a data-docs-component-link href="/components/toast-notifications">Toast Notifications</a><a data-docs-component-link href="/components/wysiwyg-editor">Wysiwyg Editor</a></div>
+          <div><a data-docs-component-link href="/components/advanced-date-picker">Advanced Date Picker</a><a data-docs-component-link href="/components/advanced-range-slider">Advanced Range Slider</a><a data-docs-component-link href="/components/chart">Chart</a><a data-docs-component-link href="/components/clipboard">Clipboard</a><a data-docs-component-link href="/components/confetti">Confetti</a><a data-docs-component-link href="/components/data-map">Data Map</a><a data-docs-component-link href="/components/drag-and-drop">Drag And Drop</a><a data-docs-component-link href="/components/file-upload">File Upload</a><a data-docs-component-link href="/components/map">Map</a><a data-docs-component-link href="/components/toast-notifications">Toast Notifications</a><a data-docs-component-link href="/components/wysiwyg-editor">Wysiwyg Editor</a></div>
         </section>
         <section class="docs-directory-group">
           <a class="docs-directory-heading" href="/layout">Layout</a>
@@ -71,7 +71,7 @@ layout Showcase {
         </section>
         <section class="docs-directory-group">
           <a class="docs-directory-heading" href="/tables">Tables</a>
-          <div><a data-docs-component-link href="/components/table">Table</a></div>
+          <div><a data-docs-component-link href="/components/data-table">Data Table</a></div>
         </section>
           </nav>
           <p class="docs-directory-empty" data-docs-empty>No components found.</p>