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/TaskDocumentList.vue

@@ -32,14 +32,15 @@
                 </div>
 
                 <!-- Delete button -->
-                <button
+                <MalioButtonIcon
                     v-if="isAdmin"
-                    type="button"
-                    class="absolute right-1 top-1 hidden rounded p-0.5 text-neutral-400 transition-colors hover:bg-red-50 hover:text-red-500 group-hover:block"
+                    icon="heroicons:x-mark"
+                    aria-label="Supprimer"
+                    variant="ghost"
+                    icon-size="16"
+                    button-class="absolute right-1 top-1 hidden text-neutral-400 hover:bg-red-50 hover:text-red-500 group-hover:block"
                     @click.stop="$emit('delete', doc)"
-                >
-                    <Icon name="heroicons:x-mark" class="h-4 w-4" />
-                </button>
+                />
             </div>
         </div>
     </div>