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/pages/profile.vue

@@ -26,15 +26,14 @@
                     />
                 </label>
 
-                <button
+                <MalioButton
                     v-if="auth.user?.avatarUrl"
-                    type="button"
-                    class="rounded-lg border border-red-300 px-4 py-2 text-sm font-medium text-red-600 hover:bg-red-50"
+                    variant="danger"
+                    button-class="w-auto px-4"
                     :disabled="removing"
+                    :label="$t('profile.removeAvatar')"
                     @click="onRemove"
-                >
-                    {{ $t('profile.removeAvatar') }}
-                </button>
+                />
             </div>
         </div>