fix: point credits funding at the /agent page

The credits funding handoff opened wallet.tempo.xyz/?action=fund&intent=credits.
Now that agent payments live on a dedicated /agent page (wallet-next #549), point
the `fund --credits` handoff at /agent?action=fund&intent=credits so it lands on —
and auto-opens the deposit dialog on — that page. Other fund targets are unchanged.

Author: JasonwLi

.changelog/credits-fund-agent-url.md

@@ -0,0 +1,5 @@
+---
+tempo-wallet: patch
+---
+
+Point the credits funding handoff URL at the dedicated /agent page.

crates/tempo-wallet/src/commands/fund/mod.rs

@@ -298,7 +298,12 @@ fn build_fund_url(auth_server_url: &str, target: &Target) -> Result<String, Temp
         source,
     })?;
 
-    url.set_path("/");
+    // Credits funding lives on the dedicated /agent page; everything else opens the
+    // wallet home with the relevant action.
+    url.set_path(match target {
+        Target::Credits => "/agent",
+        _ => "/",
+    });
     url.set_query(None);
 
     {
@@ -517,7 +522,7 @@ mod tests {
                 &Target::Credits
             )
             .unwrap(),
-            "https://wallet.moderato.tempo.xyz/?action=fund&intent=credits"
+            "https://wallet.moderato.tempo.xyz/agent?action=fund&intent=credits"
         );
         assert_eq!(
             build_fund_url(

crates/tempo-wallet/tests/remote_flows.rs

@@ -776,7 +776,7 @@ async fn fund_no_browser_credits_waits_for_credit_balance_change() {
     )
     .await;
     let temp = build_fund_temp(&rpc.base_url);
-    let expected_url = format!("{}/?action=fund&intent=credits", rpc.base_url);
+    let expected_url = format!("{}/agent?action=fund&intent=credits", rpc.base_url);
 
     let output = test_command(&temp)
         .env("TEMPO_AUTH_URL", rpc.auth_url())