Add "reste à dépenser" tile to the dashboard

Shows the total remaining depense budget for the selected period,
above the breakdown table — reuses the totals.reste figure already
computed per section, no new query.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

resources/views/livewire/dashboard/index.blade.php

@@ -22,6 +22,11 @@
         </div>
     </div>
 
+    <div class="bg-surface shadow rounded-lg p-4 max-w-xs">
+        <p class="text-xs text-text-muted">Reste à dépenser</p>
+        <p class="mt-1 text-lg font-semibold text-negative">{{ number_format($sections['depense']['totals']['reste'], 2, ',', ' ') }} €</p>
+    </div>
+
     @php
         $colors = [
             'revenu' => ['bg' => 'bg-positive-fill', 'row' => 'bg-positive-surface/40'],

tests/Feature/DashboardTest.php

@@ -50,6 +50,29 @@ it('filters tracked and budget to a single month when a period is selected', fun
     expect($sections['depense']['totals']['budget'])->toBe(270.0);
 });
 
+it('computes the remaining depense budget total for the tile', function (): void {
+    $user = User::factory()->create();
+    $household = $user->currentHousehold;
+    $loyer = $household->categories()->create(['name' => 'Loyer', 'type' => 'depense', 'position' => 1]);
+    $courses = $household->categories()->create(['name' => 'Courses', 'type' => 'depense', 'position' => 2]);
+
+    $loyer->budgetLines()->create(['household_id' => $household->id, 'year' => 2026, 'month' => null, 'amount' => 1000]);
+    $courses->budgetLines()->create(['household_id' => $household->id, 'year' => 2026, 'month' => null, 'amount' => 400]);
+
+    $household->transactions()->create([
+        'category_id' => $loyer->id, 'user_id' => $user->id,
+        'date' => '2026-03-05', 'date_effective' => '2026-03-05', 'amount' => 1000,
+    ]);
+    $household->transactions()->create([
+        'category_id' => $courses->id, 'user_id' => $user->id,
+        'date' => '2026-03-05', 'date_effective' => '2026-03-05', 'amount' => 150,
+    ]);
+
+    $component = Livewire::actingAs($user)->test(Index::class)->set('year', 2026)->set('period', '3');
+
+    expect($component->viewData('sections')['depense']['totals']['reste'])->toBe(250.0);
+});
+
 it('excludes zero-tracked categories from chart data and caps it at 6', function (): void {
     $user = User::factory()->create();
     $household = $user->currentHousehold;