feat(ui): implement full UI layer for all modules

Add interactive island components and server partials for notes,
students, and admin modules, following the Figma prototype design.

- static/styles/ui.css: shared component library (buttons, tables,
  chips, cards, filters, tabs, form inputs)
- notes: NotesView (student grade view with UE cards, promo tabs,
  weighted averages), AdminConsultNotes, AdminUEs islands + partials
- students: ConsultStudents (list/filter/delete), AdminPromotions
  (CRUD) islands + partials
- admin: AdminModules, AdminUsers, AdminRoles islands + partials
- All partials use State type with unknown cast for session access

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

routes/(apps)/notes/(_props)/props.ts

@@ -4,11 +4,12 @@ const properties: AppProperties = {
   name: "PolyNotes",
   icon: "school",
   pages: {
-    index: "Homepage",
-    notes: "Notes",
-    courses: "Courses management",
+    index: "Accueil",
+    notes: "Mes notes",
+    courses: "Consulter",
+    ues: "UEs",
   },
-  adminOnly: ["courses", "students"],
+  adminOnly: ["courses", "ues"],
   hint: "Student grading management",
 };