Move webhook pages to /hook/ID and inbound URLs to /h/UUID (closes #367)

The webhook page and everything under it move from /source/ID to
/hook/ID, the list and new-webhook form to /hooks and /hooks/new, and
the event log from .../logs to /hook/ID/events, body download
included. Entrypoint URLs move from /webhook/UUID to /h/UUID, and the
webhook page shows only that form. The old paths are gone.

Links, redirects, form actions, tests, comments and the README follow.
Both links to the event log page, and its title and heading, now read
"Full Event Log". Go identifiers and template file names are
unchanged. Route tests follow every link and submit every form the
templates render to a moved page, through the production router, with
the link, form action and token taken from the rendered page.

Model: opus-5-5

internal/server/routes_test.go

@@ -1039,6 +1039,67 @@ func TestHook_ResubmitFromEventLog(t *testing.T) {
 	assert.Equal(t, int64(2), events, "the resubmit stores a new event")
 }
 
+// TestHook_LinksBetweenPages follows each link to a webhook page that
+// the tests above do not: the navbar's "Webhooks" links, the back and
+// Cancel links, the list's link to a webhook, the "Full Event Log"
+// link beside the recent events, and the event log's page links. Each
+// must point where it should, and that page must render.
+func TestHook_LinksBetweenPages(t *testing.T) {
+	t.Parallel()
+
+	env := newTestEnv(t)
+
+	userID, _ := env.seedUser(t, "navigator", "somepassword")
+	cookies := env.authCookies(t, userID, "navigator")
+	wh := env.seedWebhook(t, userID)
+	tgt := env.seedTarget(t, wh.ID)
+
+	// The event log shows 25 events a page; one more gives it a second
+	// page, so it renders its Next and Previous links.
+	for range 26 {
+		env.seedEvent(t, wh.ID, "paged")
+	}
+
+	list := "/hooks"
+	newForm := list + "/new"
+	page := "/hook/" + wh.ID
+	targetEdit := page + "/targets/" + tgt.ID + "/edit"
+	events := page + "/events"
+	back := `href="([^"]+)"[^>]*>← Back to `
+	cancel := `href="([^"]+)"[^>]*>Cancel<`
+
+	for _, link := range []struct{ from, pattern, want string }{
+		// The navbar on the profile page: its desktop link, then its
+		// mobile menu link.
+		{
+			"/user/navigator/",
+			`href="([^"]+)" class="btn-text">Webhooks<`,
+			list,
+		},
+		{
+			"/user/navigator/",
+			`href="([^"]+)" class="btn-text w-full[^"]*">Webhooks<`,
+			list,
+		},
+		{list, `href="(/hook/[^"]+)"`, page},
+		{newForm, back, list},
+		{newForm, cancel, list},
+		{page, back, list},
+		{page, `Recent Events</h2>\s*<a href="([^"]+)"`, events},
+		{page + "/edit", back, page},
+		{page + "/edit", cancel, page},
+		{targetEdit, back, page},
+		{targetEdit, cancel, page},
+		{events, back, page},
+		{events, `href="([^"]+)"[^>]*>Next &rarr;<`, events + "?page=2"},
+		{events + "?page=2", `href="([^"]+)"[^>]*>&larr; Previous<`, events + "?page=1"},
+	} {
+		got := env.urlFrom(t, link.from, link.pattern, cookies)
+		assert.Equal(t, link.want, got, "%s: %s", link.from, link.pattern)
+		assert.Equal(t, http.StatusOK, env.get(got, cookies).Code, got)
+	}
+}
+
 // TestSourceLogs_TruncationLinkDownloadsTheBody walks the whole
 // feature the way a user does: render the event log page through
 // the production router, take the download URL out of the markup