fix(login): Return promise from passkey authentication to fix automatic prompt (#10991)

# Which Problems Are Solved

The passkey login page was not rendering properly in production (Cloud
Run) deployments, with the submit button and component content not
appearing. Additionally, the automatic passkey prompt was not triggering
correctly.

# How the Problems Are Solved

Added the missing return statement before navigator.credentials.get() in
the submitLoginAndContinue function. This ensures the promise is
properly returned and chained in the useEffect hook, fixing the
automatic passkey prompt flow.

Removes the recently introduces guides to passkeys that could result in
a hydration error due to the <a> tag being rendered differently on
server / client environement

# Additional Changes

This issue was most probably introduced in PR #10971. The component uses
promise chaining (.then().catch().finally()) which requires the promise
to be returned, unlike the RegisterPasskey component which uses
async/await and works correctly without an explicit return.

apps/login/locales/zh.json

@@ -261,10 +261,6 @@
     "verify": {
       "title": "使用密钥认证",
       "description": "您的设备将请求指纹、面部识别或屏幕锁",
-      "info": {
-        "description": "使用您设置的密钥进行安全认证。",
-        "link": "了解更多关于密钥"
-      },
       "usePassword": "使用密码",
       "submit": "继续",
       "errors": {