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)/students/(_props)/props.ts

@@ -4,11 +4,12 @@ const properties: AppProperties = {
   name: "Students",
   icon: "badge",
   pages: {
-    index: "Homepage",
-    upload: "Upload students",
-    consult: "Consult students",
+    index: "Accueil",
+    consult: "Élèves",
+    promotions: "Promotions",
+    upload: "Import xlsx",
   },
-  adminOnly: ["upload", "consult"],
+  adminOnly: ["consult", "promotions", "upload"],
   hint: "Create students promotion and see informations",
 };