feat: Adds support for superscript in help center articles (#7279)

- Adds support for superscript when rendering article markdown
- Chatwoot Markdown Render to render markdown everywhere

Co-authored-by: Sojan <sojan@pepalo.com>

spec/lib/superscript_renderer_spec.rb

@@ -0,0 +1,50 @@
+require 'rails_helper'
+
+describe SuperscriptRenderer do
+  let(:renderer) { described_class.new }
+
+  def render_markdown(markdown)
+    doc = CommonMarker.render_doc(markdown, :DEFAULT)
+    renderer.render(doc)
+  end
+
+  describe '#text' do
+    it 'converts text wrapped in ^ to superscript' do
+      markdown = 'This is an example of a superscript: ^superscript^.'
+      expect(render_markdown(markdown)).to include('<sup>superscript</sup>')
+    end
+
+    it 'does not convert text not wrapped in ^' do
+      markdown = 'This is an example without superscript.'
+      expect(render_markdown(markdown)).not_to include('<sup>')
+    end
+
+    it 'converts multiple superscripts in the same text' do
+      markdown = 'This is an example with ^multiple^ ^superscripts^.'
+      rendered_html = render_markdown(markdown)
+      expect(rendered_html.scan('<sup>').length).to eq(2)
+      expect(rendered_html).to include('<sup>multiple</sup>')
+      expect(rendered_html).to include('<sup>superscripts</sup>')
+    end
+  end
+
+  describe 'broken ^ usage' do
+    it 'does not convert text that only starts with ^' do
+      markdown = 'This is an example with ^broken superscript.'
+      expected_output = '<p>This is an example with ^broken superscript.</p>'
+      expect(render_markdown(markdown)).to include(expected_output)
+    end
+
+    it 'does not convert text that only ends with ^' do
+      markdown = 'This is an example with broken^ superscript.'
+      expected_output = '<p>This is an example with broken^ superscript.</p>'
+      expect(render_markdown(markdown)).to include(expected_output)
+    end
+
+    it 'does not convert text with uneven numbers of ^' do
+      markdown = 'This is an example with ^broken^ superscript^.'
+      expected_output = '<p>This is an example with <sup>broken</sup> superscript^.</p>'
+      expect(render_markdown(markdown)).to include(expected_output)
+    end
+  end
+end