refactor(portal): move components to shared/public-form and portal/{event,*}

- public-form/** (18 files + 7 component tests) → shared/public-form/**
  This is the runtime form-renderer; goes into shared/ because it will
  be reused by the organizer-app Form Builder preview (S3b).
- event/{Claimen,Informatie,Overzicht,Rooster}Tab.vue → portal/event/**
- portal/{StatusCard,EventCard,UserAvatarMenu}.vue → portal/** (no
  path change — both apps had a portal/ subfolder).
- AppLoadingIndicator.vue, auth/{PasswordRequirements,MfaChallengeCard}.vue,
  settings/Mfa{Disable,Email,Totp}SetupDialog.vue: portal copies
  deleted as duplicates of pre-existing apps/app components (diffs
  were trivial formatting only).

Inside the moved files: rewrote @form-schema/* → @/composables/forms/*
and @/components/{public-form,event/[Tab]} → new sub-zone paths.

Updated apps/app/tsconfig.json to drop the @form-schema path alias
and the packages/form-schema include path. Updated formSchema.ts to
import from @/composables/forms/types/formBuilder. Carried the
crypto polyfill from apps/portal/tests/setup.ts into
apps/app/tests/setup.ts (needed by useFormDraft tests landing in C.4).

NOTE: Some moved tests still fail because they reference portal
composables (usePublicFormSections, useFormDraft) that move in C.4.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/app/tsconfig.json

@@ -40,9 +40,6 @@
       "@validators": [
         "./src/@core/utils/validators"
       ],
-      "@form-schema/*": [
-        "../../packages/form-schema/src/*"
-      ],
       "vue": [
         "./node_modules/vue"
       ]
@@ -69,8 +66,7 @@
     "./src/**/*.vue",
     "./themeConfig.ts",
     "./auto-imports.d.ts",
-    "./components.d.ts",
-    "../../packages/form-schema/src/**/*"
+    "./components.d.ts"
   ],
   "exclude": [
     "./dist",