Use uri for the like and bookmark permalinks

`uri` is the attribute every other postable model uses for its absolute
permalink on this site. Add it to Like, which had none, and rename
Bookmark's `local_uri` to match. `url` stays as the thing being liked or
bookmarked.

Refs #148

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/Models/Like.php

@@ -18,6 +18,13 @@ class Like extends Model
     use FilterHtml;
     use HasFactory;
 
+    protected function uri(): Attribute
+    {
+        return Attribute::get(
+            get: fn () => config('app.url').'/likes/'.$this->id,
+        );
+    }
+
     protected function url(): Attribute
     {
         return Attribute::set(