only render retrieve context button if semantic index is enabled

crates/assistant/src/assistant_panel.rs

@@ -2750,7 +2750,8 @@ impl View for InlineAssistant {
                             .element()
                             .aligned(),
                     )
-                    .with_child(
+                    .with_children(if SemanticIndex::enabled(cx) {
+                        Some(
                             Button::action(ToggleRetrieveContext)
                                 .with_tooltip("Retrieve Context", theme.tooltip.clone())
                                 .with_id(self.id)
@@ -2762,6 +2763,9 @@ impl View for InlineAssistant {
                                 .element()
                                 .aligned(),
                         )
+                    } else {
+                        None
+                    })
                     .with_children(if let Some(error) = self.codegen.read(cx).error() {
                         Some(
                             Svg::new("icons/error.svg")

crates/assistant/src/prompts.rs

@@ -2,7 +2,6 @@ use crate::codegen::CodegenKind;
 use language::{BufferSnapshot, OffsetRangeExt, ToOffset};
 use std::cmp::{self, Reverse};
 use std::fmt::Write;
-use std::iter;
 use std::ops::Range;
 use tiktoken_rs::ChatCompletionRequestMessage;