[Fonts] Migrate ChatLog surfaces to theme font role (#7537)

* [Fonts] Migrate ChatLog surfaces to theme font role

* [Fonts] Keep ChatView on the app font and share the report log font

- ChatLog's unset fallback is qApp->font() again: ChatView never set a font
  before the role existed, so an unset role must not switch chat and the game
  log to monospace at the system GeneralFont size.
- Move the monospace fallback the report dialogs used before into
  report_utils::reportLogFont(), which returns the theme's ChatLog role when it
  is set and the old monospace otherwise. tab_report, dlg_my_reports and
  dlg_report_user now share it, so they cannot drift and they honour a themed
  size instead of overriding it.

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Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>

cockatrice/src/interface/widgets/dialogs/dlg_report_user.h

@@ -27,6 +27,7 @@ public:
 private slots:
     void actSubmit();
     void reportResponse(const Response &response);
+    void applyChatLogFont();
 
 private:
     static QString categoryLabel(const QString &key);