feat: add notification center with bell dropdown, full page, and workspace scoping (Story 3.3)

Enhance NotificationDropdown with type-specific icons, French description builder,
click-to-navigate with mark-as-read, and "Voir toutes les notifications" link.
Add full notifications page at /notifications with pagination (25/page), individual
mark-as-read, and empty state. Includes code review fixes: workspace-scoped unread
count and dropdown items, race condition fix (mark-as-read before navigate),
efficient markAllAsRead via direct update, deleted declaration URL handling,
and per-workspace cache keys. 7 new feature tests.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/Feature/Notifications/NotificationCenterTest.php

@@ -0,0 +1,156 @@
+<?php
+
+use App\Models\Declaration;
+use App\Models\User;
+use App\Models\Workspace;
+use App\Notifications\DocumentUploadedNotification;
+use App\Notifications\NudgeNotification;
+use Illuminate\Support\Facades\Mail;
+use Inertia\Testing\AssertableInertia;
+
+function setupNotificationCenterTest(): array
+{
+    Mail::fake();
+
+    $user = User::factory()->create();
+    $workspace = Workspace::factory()->create();
+    $workspace->users()->attach($user->id, ['role' => 'owner', 'permissions' => []]);
+
+    session(['current_workspace_id' => $workspace->id]);
+
+    $declaration = Declaration::factory()->forWorkspace($workspace)->create();
+
+    return [$user, $workspace, $declaration];
+}
+
+// ── AC #1: Dropdown rendering ────────────────────────────
+
+test('notification dropdown renders with unread count badge via shared props', function () {
+    [$user, $workspace, $declaration] = setupNotificationCenterTest();
+    $sender = User::factory()->create();
+
+    $user->notify(new NudgeNotification($declaration, $sender));
+    $user->notify(new NudgeNotification($declaration, $sender));
+
+    $response = $this->actingAs($user)->get(route('dashboard'));
+
+    $response->assertOk();
+    $response->assertInertia(fn (AssertableInertia $page) => $page
+        ->has('userNotifications')
+        ->where('userNotifications.unread_count', 2)
+        ->has('userNotifications.readUrl')
+        ->has('userNotifications.readAllUrl')
+        ->has('userNotifications.notificationsUrl')
+    );
+});
+
+// ── AC #1: Clicking notification marks as read ───────────
+
+test('clicking notification marks it as read via POST to notifications.read', function () {
+    [$user, $workspace, $declaration] = setupNotificationCenterTest();
+    $sender = User::factory()->create();
+
+    $user->notify(new NudgeNotification($declaration, $sender));
+    $notification = $user->notifications()->first();
+    expect($notification->read_at)->toBeNull();
+
+    $response = $this->actingAs($user)->post(route('notifications.read', $notification->id));
+
+    $response->assertRedirect();
+    $notification->refresh();
+    expect($notification->read_at)->not->toBeNull();
+});
+
+// ── AC #1: Mark all as read ──────────────────────────────
+
+test('mark all as read clears unread count for current workspace', function () {
+    [$user, $workspace, $declaration] = setupNotificationCenterTest();
+    $sender = User::factory()->create();
+
+    $user->notify(new NudgeNotification($declaration, $sender));
+    $user->notify(new DocumentUploadedNotification($declaration, 1));
+
+    expect($user->unreadNotifications()->count())->toBe(2);
+
+    $response = $this->actingAs($user)->post(route('notifications.readAll'));
+
+    $response->assertRedirect();
+    $user->refresh();
+    expect($user->unreadNotifications()->count())->toBe(0);
+});
+
+// ── AC #2: Full page renders with workspace-scoped notifications ──
+
+test('notifications page renders with workspace-scoped notifications', function () {
+    [$user, $workspace, $declaration] = setupNotificationCenterTest();
+    $sender = User::factory()->create();
+
+    $user->notify(new NudgeNotification($declaration, $sender));
+
+    $response = $this->actingAs($user)->get(route('notifications.index'));
+
+    $response->assertOk();
+    $response->assertInertia(fn (AssertableInertia $page) => $page
+        ->component('notifications/Index')
+        ->has('notifications.data', 1)
+        ->has('markAllReadUrl')
+        ->has('readUrl')
+    );
+});
+
+// ── AC #2: Pagination at 25 per page ─────────────────────
+
+test('notifications page pagination works at 25 per page', function () {
+    [$user, $workspace, $declaration] = setupNotificationCenterTest();
+
+    for ($i = 0; $i < 30; $i++) {
+        $user->notify(new DocumentUploadedNotification($declaration, 1));
+    }
+
+    $response = $this->actingAs($user)->get(route('notifications.index'));
+
+    $response->assertOk();
+    $response->assertInertia(fn (AssertableInertia $page) => $page
+        ->component('notifications/Index')
+        ->has('notifications.data', 25)
+        ->where('notifications.last_page', 2)
+    );
+});
+
+// ── AC #3: Empty state renders when no notifications ─────
+
+test('empty state renders when no notifications exist', function () {
+    [$user, $workspace, $declaration] = setupNotificationCenterTest();
+
+    $response = $this->actingAs($user)->get(route('notifications.index'));
+
+    $response->assertOk();
+    $response->assertInertia(fn (AssertableInertia $page) => $page
+        ->component('notifications/Index')
+        ->has('notifications.data', 0)
+    );
+});
+
+// ── AC #2: Cross-workspace isolation ─────────────────────
+
+test('notifications are scoped to current workspace and do not leak across workspaces', function () {
+    [$user, $workspace1, $declaration1] = setupNotificationCenterTest();
+
+    $workspace2 = Workspace::factory()->create();
+    $workspace2->users()->attach($user->id, ['role' => 'owner', 'permissions' => []]);
+    $declaration2 = Declaration::factory()->forWorkspace($workspace2)->create();
+
+    // Notify for both workspaces
+    $user->notify(new DocumentUploadedNotification($declaration1, 1));
+    $user->notify(new DocumentUploadedNotification($declaration2, 1));
+
+    // Session is set to workspace1
+    $response = $this->actingAs($user)->get(route('notifications.index'));
+
+    $response->assertOk();
+    $response->assertInertia(fn (AssertableInertia $page) => $page
+        ->component('notifications/Index')
+        ->has('notifications.data', 1)
+        ->where('notifications.data.0.data.workspace_id', $workspace1->id)
+    );
+});