QA plans al sugerir HU + cancel analisis + datepicker shadcn

- project-analyzer: saveAsDrafts genera QA plan por cada HU sugerida
- DashboardView: cancelAnalysis con AbortController + mensaje limpio
- HuDrafts: DatePicker con Calendar + Popover (shadcn-vue)
- HuDrafts: formulario dinámico segun tipo (Epic vs HU/Feature/etc)
- components/ui: Popover + Calendar creados
- qa_plans: tabla separada (cubre drafts + user_stories existentes)

src/i18n/locales/en.json

@@ -320,9 +320,9 @@
   },
   "hierarchy": {
     "epic": "Epic",
-    "hu": "HU",
     "feature": "Feature",
     "task": "Task",
+    "hu": "HU",
     "bug": "Bug"
   },
   "workitems": {