FIXED - Make adding a portfolio project simpler and actually saveable

- Fix critical bug: TabsContent unmounted inactive panels, so the project
  form only submitted the active tab's fields and could never save; add an
  opt-in forceMount that keeps panels mounted (hidden) and use it on all
  four project-form tabs
- Make Sections and Assets optional: a project saves with just Basics and
  Localized Content; new projects start with no sections/assets, and the
  last one can now be removed
- Update wizard progress so empty sections/assets steps count as complete
- Update save hint copy and step labels to reflect the optional steps
- Correct .claude/launch.json dev port to 3014
- Update portfolio-form-progress tests for the optional-steps behaviour

.claude/launch.json

@@ -5,7 +5,7 @@
       "name": "dev",
       "runtimeExecutable": "npm",
       "runtimeArgs": ["run", "dev"],
-      "port": 3000
+      "port": 3014
     }
   ]
 }