Editing a message and adding a space at the end counts as spam.

How to reproduce:
- Send a message
- Edit the message and add a space at the end
- The bot will count it as spam

No files or tests are named in the issue. Start by locating the message-edit handling and spam-detection paths, then trace how trailing spaces affect the comparison. Done means editing a message only by adding a trailing space no longer causes the bot to count it as spam, while genuine spam detection remains covered by the relevant tests.

Written by the indexing model from the issue text.