Add undetermined-cipher-scenario-logic feature flag (#7802)

Introduced in Browser 2026.2.0 via bitwarden/clients#18395. Rewrites the
post-submit add/update login notification triggering logic, deferring
cipher-type inference until the vault is unlocked. Client-side only.

src/config.rs

@@ -1427,6 +1427,7 @@ pub const SUPPORTED_FEATURE_FLAGS: &[&str] = &[
     "pm-5594-safari-account-switching",
     "pm-32413-multi-client-password-management",
     // Autofill Team
+    "undetermined-cipher-scenario-logic",
     "enable-basic-auth-response",
     "ssh-agent",
     "ssh-agent-v2",