fix: mini timer renders via window label instead of hash routing

The mini timer window was blank because hash-based routing
(createWebHashHistory) doesn't work with Tauri's WebviewUrl path.
Now App.vue detects the mini timer by checking getCurrentWindow().label
=== 'mini-timer' and renders the MiniTimer component directly,
bypassing the router entirely.

src/App.vue

@@ -1,12 +1,16 @@
 <script setup lang="ts">
 import { onMounted, watch } from 'vue'
+import { getCurrentWindow } from '@tauri-apps/api/window'
 import TitleBar from './components/TitleBar.vue'
 import NavRail from './components/NavRail.vue'
+import MiniTimer from './views/MiniTimer.vue'
 import ToastNotification from './components/ToastNotification.vue'
 import { useSettingsStore } from './stores/settings'
 import { useTimerStore } from './stores/timer'
 
 const settingsStore = useSettingsStore()
+// Detect mini timer by Tauri window label — no routing needed
+const isMiniTimer = getCurrentWindow().label === 'mini-timer'
 
 async function registerShortcuts() {
   try {
@@ -74,18 +78,26 @@ watch(() => [settingsStore.settings.shortcut_toggle_timer, settingsStore.setting
 </script>
 
 <template>
-  <div class="h-full w-full flex flex-col bg-bg-base">
-    <TitleBar />
-    <div class="flex-1 flex overflow-hidden">
-      <NavRail />
-      <main class="flex-1 overflow-auto">
-        <router-view v-slot="{ Component }">
-          <Transition name="page" mode="out-in">
-            <component :is="Component" :key="$route.path" />
-          </Transition>
-        </router-view>
-      </main>
-    </div>
+  <!-- Mini timer: detected by window label, rendered directly (no routing) -->
+  <div v-if="isMiniTimer" class="h-full w-full bg-bg-base">
+    <MiniTimer />
   </div>
-  <ToastNotification />
+
+  <!-- Normal app shell -->
+  <template v-else>
+    <div class="h-full w-full flex flex-col bg-bg-base">
+      <TitleBar />
+      <div class="flex-1 flex overflow-hidden">
+        <NavRail />
+        <main class="flex-1 overflow-auto">
+          <router-view v-slot="{ Component }">
+            <Transition name="page" mode="out-in" :duration="{ enter: 250, leave: 150 }">
+              <component :is="Component" :key="$route.path" />
+            </Transition>
+          </router-view>
+        </main>
+      </div>
+    </div>
+    <ToastNotification />
+  </template>
 </template>