Show ActionText HTML content in deduper preview

[Copilot]

What is the goal of this PR and why is this important?

Display formatted ActionText content in the deduper instead of stripped plain text for has_rich_text fields.

How did you approach the change?

Modified app/views/dedupes/_preview.html.erb:

• Delete column: Render ActionText object directly (<%= delete_rt %>) to show formatted content
• Keep column: Display HTML source in textarea (keep_rt&.body&.to_s) for editing without WYSIWYG
• Comparison: Compare HTML bodies instead of plain text for difference detection

Example change:

# Before: stripped plain text
<% delete_body = record_to_delete.public_send(rt_attr)&.to_plain_text.presence %>
<p><%= delete_body %></p>

# After: rendered HTML content
<% delete_rt = record_to_delete.public_send(rt_attr) %>
<div><%= delete_rt %></div>

Anything else to add?

Rails ActionText handles sanitization automatically. Form submission works unchanged—the controller already permits rich text attributes via rich_text_attribute_names(mc).

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