refactor : migrate UI to Malio layer-ui components (MalioButton, MalioDrawer, MalioSelectCheckbox)

- Replace all AppDrawer with MalioDrawer across 10 drawer components
- Replace native <button> with MalioButton/MalioButtonIcon in all pages and components
- Fix TimeTrackingExportDrawer: use MalioSelectCheckbox for multi-select filters
- Add Malio design system colors (m-btn-*, m-disabled, m-surface) to tailwind.config.ts
- Align toggle button heights with MalioButton (h-[40px])

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

frontend/components/task/TaskBulkActions.vue

@@ -72,13 +72,14 @@
             />
 
             <!-- Delete -->
-            <button
-                class="flex h-9 w-9 shrink-0 items-center justify-center self-end rounded-md text-neutral-500 transition-colors hover:bg-red-50 hover:text-red-500"
-                title="Supprimer"
+            <MalioButtonIcon
+                icon="mdi:delete-outline"
+                aria-label="Supprimer"
+                variant="ghost"
+                icon-size="22"
+                button-class="self-end text-neutral-500 hover:bg-red-50 hover:text-red-500"
                 @click="emit('bulk-delete')"
-            >
-                <Icon name="mdi:delete-outline" size="22" />
-            </button>
+            />
         </div>
     </div>
 </template>