chore: misc UI improvements (#317)

Co-authored-by: Letta <noreply@letta.com>

src/cli/components/ShimmerText.tsx

@@ -5,16 +5,19 @@ import { colors } from "./colors.js";
 
 interface ShimmerTextProps {
   color?: string;
+  boldPrefix?: string;
   message: string;
   shimmerOffset: number;
 }
 
 export const ShimmerText: React.FC<ShimmerTextProps> = ({
   color = colors.status.processing,
+  boldPrefix,
   message,
   shimmerOffset,
 }) => {
-  const fullText = `${message}…`;
+  const fullText = `${boldPrefix ? `${boldPrefix} ` : ""}${message}…`;
+  const prefixLength = boldPrefix ? boldPrefix.length + 1 : 0; // +1 for space
 
   // Create the shimmer effect - simple 3-char highlight
   const shimmerText = fullText
@@ -22,11 +25,14 @@ export const ShimmerText: React.FC<ShimmerTextProps> = ({
     .map((char, i) => {
       // Check if this character is within the 3-char shimmer window
       const isInShimmer = i >= shimmerOffset && i < shimmerOffset + 3;
+      const isInPrefix = i < prefixLength;
 
       if (isInShimmer) {
-        return chalk.hex(colors.status.processingShimmer)(char);
+        const styledChar = chalk.hex(colors.status.processingShimmer)(char);
+        return isInPrefix ? chalk.bold(styledChar) : styledChar;
       }
-      return chalk.hex(color)(char);
+      const styledChar = chalk.hex(color)(char);
+      return isInPrefix ? chalk.bold(styledChar) : styledChar;
     })
     .join("");