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

At phone width, the event log cut off long event IDs and content types along with the statuses and times after them, and the webhook page ran long names past their cards and scrolled sideways. Elements that hold only a long value (a webhook, target or entrypoint name or description, an event ID, a content type) now break inside it, and the event log's title row wraps; rows themselves still wrap rather than squeeze. Wide screens are unchanged. A 390-pixel browser check of both pages, an event's attempts open, fails when anything runs past the page's or a card's edge or the page scrolls sideways.

Model: opus-5-5

README.md

@@ -1280,7 +1280,9 @@ the event log only the newest starts expanded, and an event there expands and
 collapses when its row's caret or its ID is clicked, and from the keyboard, but
 not when its ID is selected with the mouse, and a delivery's attempts inside it
 expand and collapse; and at phone width the menu button opens and closes the
-mobile menu. It also fails if the browser reports a console warning or error, an
+mobile menu, and neither the webhook page nor the event log, with a delivery's
+attempts open, scrolls sideways or cuts anything off at the page's or a card's
+edge. It also fails if the browser reports a console warning or error, an
 uncaught exception, or anything the policy refused. `make check` and the image
 build lint it but do not run it, and `make test` leaves it out (its file is
 built only with the `browser` build tag). Run it with `make test-browser` after