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/ui/AppDrawer.vue

@@ -13,13 +13,13 @@
                 >
                     <div class="flex items-center justify-between border-b border-neutral-200 px-6 py-4">
                         <h2 class="text-lg font-bold text-neutral-900">{{ title }}</h2>
-                        <button
-                            type="button"
-                            class="rounded p-1 text-neutral-400 hover:text-neutral-600"
+                        <MalioButtonIcon
+                            icon="mdi:close"
+                            aria-label="Fermer"
+                            variant="ghost"
+                            icon-size="24"
                             @click="close"
-                        >
-                            <Icon name="mdi:close" size="24" />
-                        </button>
+                        />
                     </div>
                     <div class="flex-1 overflow-y-auto px-6 py-4">
                         <slot />