feat: 优化密码可见性图标显示，调整图标大小

src/views/auth/signup.vue

@@ -1,6 +1,7 @@
 <script lang='ts' setup>
 import { faker } from "@faker-js/faker";
 import { toastController } from "@ionic/vue";
+import { eyeOffOutline, eyeOutline } from "ionicons/icons";
 import { ref } from "vue";
 import { useRouter } from "vue-router";
 import { safeClient } from "@/api";
@@ -143,7 +144,7 @@ function goToTerms(type: "service" | "privacy") {
             />
             <ion-icon
               slot="end"
-              :icon="showPassword ? 'eye-outline' : 'eye-off-outline'"
+              :icon="showPassword ? eyeOutline : eyeOffOutline"
               class="password-toggle"
               @click="showPassword = !showPassword"
             />
@@ -159,7 +160,7 @@ function goToTerms(type: "service" | "privacy") {
             />
             <ion-icon
               slot="end"
-              :icon="showConfirmPassword ? 'eye-outline' : 'eye-off-outline'"
+              :icon="showConfirmPassword ? eyeOutline : eyeOffOutline"
               class="password-toggle"
               @click="showConfirmPassword = !showConfirmPassword"
             />
@@ -387,7 +388,7 @@ function goToTerms(type: "service" | "privacy") {
 
 .password-toggle {
   color: #8b949e;
-  font-size: 22px;
+  font-size: 16px;
   cursor: pointer;
 }