Fix Wi-Fi password recovery after authentication failure

[cristianbica]

Closing the Wi-Fi panel while an incorrect password is being authenticated can leave it showing “Passphrase required” without a password field when reopened. The failure handler refreshes the row model, which can destroy the calling delegate before it opens the password prompt, producing a QML reference/type error.

Move password recovery into the panel-owned failure handler before refreshing the rows. The delegate now only forwards the failure. Add a regression test that invalidates the delegate during refresh and verifies credential recovery, action cleanup, and ignored unrelated failures.

Related to #10406. The missing password field was reproduced; the reported inability to forget the network was not reproduced.

Validation:

• Network regression tests and QML text-format checks pass.
• Reproduced before and verified after in an Omarchy 4.0.2 QEMU/KVM guest using two mac80211_hwsim virtual radios, hostapd WPA2, and DHCP.
• After the fix, reopening restores password entry; entering the correct password connects and receives a DHCP address.

Investigation and screenshots

Before

before.mp4

After

after.mp4