chore(studio): editor 0.4.0 — port geometry + endpoint editor + unsaved badge

Picks up fai_studio_flow_editor 0.4.0 (commit fb88926):

 - Connection dots now line up with their inline port-row
   labels (header geometry rewrite so subtitle space is
   always reserved).
 - Inputs endpoint colours its output ports by declared
   type (text / bytes / json / file / number).
 - Selecting the inputs or outputs endpoint opens a
   dedicated editor in the properties panel — add /
   rename / retype / remove without touching YAML.
 - "Unsaved" badge replaces the easy-to-miss 8-px dot;
   filename also colours primary when dirty.

Version 0.53.0 -> 0.53.1.

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

pubspec.lock

@@ -125,10 +125,10 @@ packages:
     description:
       path: "."
       ref: main
-      resolved-ref: "296e5bfd018e523e7527abc457de3a62c1ba5139"
+      resolved-ref: fb8892687d7d3449c9e073789bd17b5a3e16bfed
       url: "https://git.flemming.ai/fai/studio-flow-editor"
     source: git
-    version: "0.3.0"
+    version: "0.4.0"
   fake_async:
     dependency: transitive
     description: