chore: refine code fence escaping and cleanup reassignment typing

Agent-Logs-Url: https://github.com/statch/gitbot/sessions/71de78f4-95f9-4b00-bbde-4a621af540f1

Co-authored-by: seven7ty <63970738+seven7ty@users.noreply.github.com>

Author: Copilot

cogs/github/numbered/commits.py

@@ -115,8 +115,8 @@ async def commit_command(self,
             message: str = (f"{self.bot.mgr.truncate(commit['messageBody'], 247, full_word=True)}"
                             if commit['messageBody'] and commit['messageBody'] != commit['messageHeadline']
                             else '')
-            full_headline: str = self.bot.mgr.sanitize_codeblock_content(full_headline)
-            message: str = self.bot.mgr.sanitize_codeblock_content(message)
+            full_headline = self.bot.mgr.sanitize_codeblock_content(full_headline)
+            message = self.bot.mgr.sanitize_codeblock_content(message)
             empty: str = ctx.l.commit.fields.message.empty if not full_headline and not message else ''
             message: str = '```' + full_headline + message + empty + '```'
             embed.add_field(name=f':notepad_spiral: {ctx.l.commit.fields.message.name}:', value=message)

lib/manager.py

@@ -242,7 +242,7 @@ def sanitize_codeblock_content(content: str | None, neutralize_mentions: bool =
         """
         if not content:
             return ''
-        content = content.replace('```', '`\u200b``')
+        content = content.replace('```', '`\u200b`\u200b`')
         if neutralize_mentions:
             content = content.replace('@', '@\u200b')
         return content