[openstreetmap/openstreetmap-website] Provide a truncated view of recent diaries (PR #5121)

[Anton Khorev]

@AntonKhorev commented on this pull request.



> @@ -2,7 +2,7 @@
   <%= render :partial => "diary_entry_heading", :object => diary_entry, :as => "diary_entry" %>
 
   <div class="richtext text-break" xml:lang="<%= diary_entry.language_code %>" lang="<%= diary_entry.language_code %>">
-    <%= diary_entry.body.to_html %>
+    <%= truncated ? diary_entry.truncated_body(1000).to_html : diary_entry.body.to_html %>

First markdown from the RichText object is converted to html. Then html is processed by `truncated_body` and a new RichText object is constructed. Then html is again extracted from that object. And if the html is nontrivial it may get mangled in the process, turning, for example, this

```
There's a table below:

| thing | 42 | an important thing |
| thing | 43 | an important thing |
```

![image](https://github.com/user-attachments/assets/06149a10-3199-4881-bf89-091ec8842dc6)

into this

![image](https://github.com/user-attachments/assets/0661fb58-0bc4-414c-b850-476c6621873a)


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