fix(csr,ui): deliver component outputs to parent bindings

An output only reaches a parent @binding when the component calls
output.<name>(). Two separate faults meant most of the library never got
there, and both failed silently at each end.

HTML lowercases attribute names, so a parent's @sizeChange registered under
"sizechange" while the component emitted "sizeChange". The lookup missed, fell
through to a DOM dispatch, and the binding was never invoked. That made all 17
camelCase outputs undeliverable -- DataTable.pageChange and .rowClick,
Map.markerClick, ChatBubble.messageClick, LayoutSplitter.sizeChange and the
rest. invokeComponentOutput now falls back to a case-insensitive lookup, and a
csr test fails without it.

Separately, 18 components dispatched hand-built CustomEvents rather than
calling output.*. A bubbling event on the component's own root never reaches a
binding, because parent handlers live in a registry only the output proxy
reads. Card, Footer, Breadcrumb, Accordion, alert, Badge, AnnouncementBar,
AvatarGroup, ToggleCount and InputNumber now emit properly; Marquee, Map,
Timeline, List and SearchBox additionally declare the outputs they were
already firing. Dispatches on window are left alone -- that is how Toaster,
Modal and DataTable signal across component boundaries.

Verified in a browser both ways before and after: an AnnouncementBar
dispatching its own bubbling "dismiss" never reached a page-level @dismiss,
and reached it immediately once it called output.dismiss().

This corrects the audit, which called the LayoutSplitter failure "narrow and
unexplained" and read 32 dead outputs as 16 components needing a rebuild.
"Outputs work elsewhere" was an assumption; the components that worked
happened to use lowercase names and output.*. The dead-output ratchet drops
from 32 to 22, and a new test forbids the raw-CustomEvent pattern outright.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

packages/ui/components/Accordion.wrn

@@ -49,22 +49,24 @@ component Accordion {
       return multiple || alwaysOpen
     }
 
-    client function dispatchAccordionEvent(sourceEvent, eventName, value, item, root, customEvent) {
-      root = sourceEvent.currentTarget.closest("[data-wrn-accordion]")
-
-      if (!root) {
-        return
-      }
-
-      customEvent = document.createEvent("CustomEvent")
-      customEvent.initCustomEvent(eventName, true, false, {
+    // Named rather than computed: an output is resolved as a property name, so
+    // output[eventName] would not reach a parent binding.
+    client function dispatchAccordionEvent(sourceEvent, eventName, value, item, payload) {
+      payload = {
         component: "Accordion",
         value: value,
         item: item,
         open: isOpen(value),
         openValues: openValues
-      })
-      root.dispatchEvent(customEvent)
+      }
+
+      if (eventName === "open") {
+        output.open(payload)
+      } else if (eventName === "close") {
+        output.close(payload)
+      } else {
+        output.change(payload)
+      }
     }
 
     client function toggleItem(sourceEvent, value, item, wasOpen) {