Break long values on the webhook page and event log at phone width (closes #391)

A name, ID or content type with no place to break ran past its row and
was cut off by the card at 390 pixels, and a long webhook name made the
webhook page scroll sideways. The elements holding such values now
carry wrap-anywhere, so a value breaks only where it must; controls,
statuses and times never do, so a row too wide for a phone still runs
past the edge. The event log's title row wraps like the webhook page's.

The browser test gains a 390-pixel check of both pages: neither scrolls
sideways and nothing shown runs past the page's or its card's edge. Its
seeded webhook name and newer event's content type are long enough to
fail without the change.

Model: opus-5-5

templates/event_request.html

@@ -6,9 +6,9 @@
      entrypoint; the request it copies did. -->
 <div class="space-y-2 text-xs">
     {{if .ResubmittedFrom}}
-    <p class="text-gray-500">The request it copies arrived at <span class="text-gray-900">{{.Entrypoint}}</span></p>
+    <p class="text-gray-500">The request it copies arrived at <span class="text-gray-900 wrap-anywhere">{{.Entrypoint}}</span></p>
     {{else}}
-    <p class="text-gray-500">Arrived at <span class="text-gray-900">{{.Entrypoint}}</span></p>
+    <p class="text-gray-500">Arrived at <span class="text-gray-900 wrap-anywhere">{{.Entrypoint}}</span></p>
     {{end}}
     {{if .HeadersCut}}
     <p class="text-gray-500">The request headers are larger than the event log shows. <a href="{{.Body.EventURL}}" class="btn-small">Show the request headers</a></p>