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/login.vue

@@ -30,13 +30,12 @@
                 />
             </div>
 
-            <button
-                type="submit"
-                class="w-full rounded-md bg-primary-500 px-4 py-2 text-base font-semibold text-white transition hover:bg-secondary-500 disabled:cursor-not-allowed disabled:opacity-60"
+            <MalioButton
+                label="Se connecter"
+                button-class="w-full"
                 :disabled="isSubmitting"
-            >
-                Se connecter
-            </button>
+                @click="handleSubmit"
+            />
             <p class="font-bold">v{{ version }}</p>
         </form>
     </div>