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>

CLAUDE.md

@@ -18,8 +18,8 @@ role-based administration.
 
 ### Current Status
 
-🚧 **In Progress** - API layer largely complete, UI pages not yet built.
-The schema below is the **final/definitive schema** that guides all development.
+🚧 **In Progress** - API layer largely complete, UI pages not yet built. The
+schema below is the **final/definitive schema** that guides all development.
 
 ---
 
@@ -135,9 +135,9 @@ erDiagram
 
 ### Current Schema
 
-The Drizzle ORM schema in `/databases/schema.ts` implements all tables:
-`roles`, `permissions`, `rolePermissions`, `users`, `promotions`, `students`,
-`modules`, `enseignements`, `ues`, `ueModules`, `notes`, `ajustements`, `mobility`.
+The Drizzle ORM schema in `/databases/schema.ts` implements all tables: `roles`,
+`permissions`, `rolePermissions`, `users`, `promotions`, `students`, `modules`,
+`enseignements`, `ues`, `ueModules`, `notes`, `ajustements`, `mobility`.
 
 ---
 
@@ -303,7 +303,9 @@ deno task check
 - **E2E** (`tests/e2e/`) — Fresh handler + real DB (handler-level, not browser)
 
 Helpers in `tests/helpers/`:
-- `handler.ts` — builds fake Fresh contexts (`makeEmployeeContext`, `makeJsonRequest`…)
+
+- `handler.ts` — builds fake Fresh contexts (`makeEmployeeContext`,
+  `makeJsonRequest`…)
 - `db_integration.ts` — seed functions + `truncateAll()` for test isolation
 - `db_mock.ts` / `api_mock.ts` — in-memory mocks for unit tests
 
@@ -339,7 +341,8 @@ nix run nixpkgs#act -- -j integration --no-cache-server # integration + e2e via
 
 ## 💡 Important Notes
 
-1. **Only missing API**: `POST /notes/import-xlsx` (#44) — all other endpoints are implemented.
+1. **Only missing API**: `POST /notes/import-xlsx` (#44) — all other endpoints
+   are implemented.
 2. **Next priority**: UI pages (none built yet) — follow the Figma prototype.
 3. **Module Pattern**: Each module should follow the same pattern: routes, API
    endpoints, components, and tests.