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>

packages/ui/components/Popover.wrn

@@ -123,12 +123,13 @@ component Popover {
 
       <section
         class="wire-popover__panel"
+        data-wrn-anchored="true"
         data-show='{open || visible}'
         role="dialog"
         aria-label='{title || triggerLabel}'
       >
         {#if showArrow}
-          <span class="wire-popover__arrow" aria-hidden="true"></span>
+          <span class="wire-popover__arrow" data-wrn-anchor-arrow="true" aria-hidden="true"></span>
         {/if}
 
         {#if title || description || icon || showClose}
@@ -471,7 +472,13 @@ component Popover {
       color: color-mix(in srgb, currentColor 76%, transparent);
     }
 
+    /*
+     * padding is reset explicitly: an app-level `button { padding: ... }` rule
+     * outranks the browser default and crushes the icon inside this
+     * fixed-size button. Same trap as Modal and Drawer.
+     */
     .wire-popover__close {
+      padding: 0;
       appearance: none;
       display: inline-flex;
       align-items: center;