[Counting]: Improvements + leaderboard command

[Evanroby]

• goaldelete toggle was writing to toggle_progress_delete instead of toggle_goal_delete, so it had zero effect on goal message deletion and was silently misconfiguring progress delete
• assign_ruin_role would crash with AttributeError on role.name when the role had been deleted from the server (get_role() returns None)
• on_raw_message_edit ruin branch constructed a discord.Message from a partial payload, guaranteed KeyError on any missing required field, so I refactored _handle_count_ruin to take channel/guild/author directly
• handle_invalid_count had toggle_delete_after defaulting to True, opposite of the guild default
• Goal normalization block was writing goals back to DB on every valid count even when nothing changed
• Dead logger.error after return in set_ruinrole
• Truncated success message in set_goal ("Current goals" cut off mid-sentence)

Also added the [p]counting leaderboard (lb) command that was documented in the README but never implemented. guild-scoped, paginated 15 per page, shows your rank in the footer if you're outside the visible page

[ltzmax]

that progress delete might be because i wrote set_toggle_progress_delete and used progress in some of them... but good catch on these, thanks alot for the pr! ^^,