Revert "fix: drop fallback title support"

This reverts commit 185b8c8.

module/src/runtime/plugin/defaults.ts

@@ -15,6 +15,12 @@ import {
   useSiteConfig,
 } from '#imports'
 
+function titleCase(s: string) {
+  return s
+    .replaceAll('-', ' ')
+    .replace(/\w\S*/g, w => w.charAt(0).toUpperCase() + w.substr(1).toLowerCase())
+}
+
 export default defineNuxtPlugin({
   name: 'nuxtseo:defaults',
   setup() {
@@ -25,7 +31,19 @@ export default defineNuxtPlugin({
     const resolveUrl = createSitePathResolver({ withBase: true, absolute: true })
     const canonicalUrl = computed(() => resolveUrl(route.path || '/').value)
 
+    const title = computed(() => {
+      if (typeof route.meta?.title === 'string')
+        return route.meta?.title
+
+      // if no title has been set then we should use the last segment of the URL path and title case it
+      const path = route.path || '/'
+      const lastSegment = path.split('/').pop()
+      return lastSegment ? titleCase(lastSegment) : null
+    })
+
     useHead({
+      // fallback title
+      title,
       link: [{ rel: 'canonical', href: canonicalUrl }],
     })