fix: auto-detect testnet when profile name contains "testnet"

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: Quentin-M

src/cli/commands/auth.rs

@@ -71,7 +71,8 @@ pub(crate) async fn run(cmd: AuthCommand, ctx: &AppContext) -> Result<CommandOut
             };
 
             // Testnet?
-            let is_testnet = if testnet || ctx.testnet {
+            let name_implies_testnet = profile_name.to_lowercase().contains("testnet");
+            let is_testnet = if testnet || ctx.testnet || name_implies_testnet {
                 true
             } else {
                 inquire::Confirm::new("Is this a testnet profile?")