feat(studio): editor 0.7.0 — typed wires + animated flow + canvas depth

Picks up fai_studio_flow_editor 0.7.0 (commit 7aeeae7):

 - Wires take the colour of the data they carry. Inputs-
   endpoint edges show their type accent (text=blue,
   bytes=orange, json=purple, file=green, number=amber)
   so the operator can trace flow data by colour alone.
 - Edges entering a currently-running step animate as
   marching dashes in the wire's accent colour. Stops
   when the step completes. The canvas comes alive
   during runs.
 - Canvas backdrop is a subtle gradient (corners recessed,
   centre lit). Nodes get layered shadows; selected nodes
   wear an accent-coloured halo. 180 ms ease-out
   transitions on hover / select / status changes.

Version 0.53.6 -> 0.54.0 (minor bump — first wave of the
2026-feel visual refresh).

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

lib/main.dart

@@ -26,7 +26,7 @@ import 'widgets/widgets.dart';
 /// Studio's own build version. Bump on every UI commit so the
 /// running app self-identifies — visible in the sidebar header
 /// and quick-glance proof that you're seeing the current build.
-const String kStudioVersion = '0.53.6';
+const String kStudioVersion = '0.54.0';
 
 Future<void> main() async {
   WidgetsFlutterBinding.ensureInitialized();