Update zed_llm_client to v0.8.1 (#30433)

This PR updates the `zed_llm_client` crate to v0.8.1.

The name of `Plan::Free` changed to `Plan::ZedFree` in this version.

Release Notes:

- N/A

crates/agent/src/debug.rs

@@ -75,7 +75,7 @@ impl Default for DebugAccountState {
         Self {
             enabled: false,
             trial_expired: false,
-            plan: Plan::Free,
+            plan: Plan::ZedFree,
             custom_prompt_usage: RequestUsage {
                 limit: UsageLimit::Unlimited,
                 amount: 0,

crates/agent/src/message_editor.rs

@@ -1085,11 +1085,11 @@ impl MessageEditor {
         let plan = user_store
             .current_plan()
             .map(|plan| match plan {
-                Plan::Free => zed_llm_client::Plan::Free,
+                Plan::Free => zed_llm_client::Plan::ZedFree,
                 Plan::ZedPro => zed_llm_client::Plan::ZedPro,
                 Plan::ZedProTrial => zed_llm_client::Plan::ZedProTrial,
             })
-            .unwrap_or(zed_llm_client::Plan::Free);
+            .unwrap_or(zed_llm_client::Plan::ZedFree);
         let usage = self.thread.read(cx).last_usage().or_else(|| {
             maybe!({
                 let amount = user_store.model_request_usage_amount()?;

crates/agent/src/ui/preview/usage_callouts.rs

@@ -39,7 +39,7 @@ impl RenderOnce for UsageCallout {
 
         let (title, message, button_text, url) = if is_limit_reached {
             match self.plan {
-                Plan::Free => (
+                Plan::ZedFree => (
                     "Out of free prompts",
                     "Upgrade to continue, wait for the next reset, or switch to API key."
                         .to_string(),
@@ -61,7 +61,7 @@ impl RenderOnce for UsageCallout {
             }
         } else {
             match self.plan {
-                Plan::Free => (
+                Plan::ZedFree => (
                     "Reaching free plan limit soon",
                     format!(
                         "{remaining} remaining - Upgrade to increase limit, or switch providers",
@@ -120,7 +120,7 @@ impl Component for UsageCallout {
                 single_example(
                     "Approaching limit (90%)",
                     UsageCallout::new(
-                        Plan::Free,
+                        Plan::ZedFree,
                         RequestUsage {
                             limit: UsageLimit::Limited(50),
                             amount: 45, // 90% of limit
@@ -131,7 +131,7 @@ impl Component for UsageCallout {
                 single_example(
                     "Limit reached (100%)",
                     UsageCallout::new(
-                        Plan::Free,
+                        Plan::ZedFree,
                         RequestUsage {
                             limit: UsageLimit::Limited(50),
                             amount: 50, // 100% of limit