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/partials/notes.tsx

@@ -1,13 +1,36 @@
+import { FreshContext } from "$fresh/server.ts";
+import { db } from "$root/databases/db.ts";
+import { students } from "$root/databases/schema.ts";
+import { and, eq } from "npm:drizzle-orm@0.45.2";
 import {
   getPartialsConfig,
   makePartials,
 } from "$root/defaults/makePartials.tsx";
-import { FreshContext } from "$fresh/server.ts";
-import { State } from "$root/routes/_middleware.ts";
+import { State } from "$root/defaults/interfaces.ts";
+import NotesView from "../(_islands)/NotesView.tsx";
 
-// deno-lint-ignore require-await
-async function Notes(_request: Request, context: FreshContext<State>) {
-  return <h2>Welcome to {context.state.session?.displayName}.</h2>;
+async function Notes(
+  _request: Request,
+  context: FreshContext<State>,
+) {
+  const session =
+    (context.state as unknown as { session: { sn: string; givenName: string } })
+      .session;
+  const { sn, givenName } = session;
+
+  let numEtud: number | null = null;
+  try {
+    const student = await db
+      .select()
+      .from(students)
+      .where(and(eq(students.nom, sn), eq(students.prenom, givenName)))
+      .then((rows) => rows[0] ?? null);
+    numEtud = student?.numEtud ?? null;
+  } catch {
+    // DB lookup failed — island will show fallback message
+  }
+
+  return <NotesView numEtud={numEtud} prenom={session.givenName} />;
 }
 
 export const config = getPartialsConfig();