Q refreshes his uniform while also goading him on, such that Picard rejects Q’s assistance
You know, when you put it like that, it's kinda obvious that Q was looking for an excuse to introduce the Enterprise to the Borg, but didn't want Picard to know that he was doing it as a favor to warn the Federation about the Borg. But since almost by definition, any intervention by the Q Continuum consitutes temporal meddling, the real question I want answered is: what was the timeline like WITHOUT Q doing that, and what about that timeline made him care enough about Picard and/or the Federation to want to make the change in the first place?
Or is "in the first place" an erroneous way to look at it, when it comes to the Q? Was that what Q was trying to communicate in "All Good Things"? Was he trying to get Picard to think like a Q, in order to have his "favorite pet" understand his POV well enough to be a proper friend to him?