fix(ui): remove redundant newlines in Gemini messages (#18538)

packages/cli/src/ui/components/messages/GeminiMessage.tsx

@@ -50,7 +50,10 @@ export const GeminiMessage: React.FC<GeminiMessageProps> = ({
           terminalWidth={terminalWidth}
           renderMarkdown={renderMarkdown}
         />
-        <Box marginBottom={1}>
+        <Box
+          marginTop={isAlternateBuffer ? 0 : 1}
+          marginBottom={isAlternateBuffer ? 1 : 0}
+        >
           <ShowMoreLines
             constrainHeight={availableTerminalHeight !== undefined}
           />

packages/cli/src/ui/components/messages/GeminiMessageContent.tsx

@@ -48,7 +48,10 @@ export const GeminiMessageContent: React.FC<GeminiMessageContentProps> = ({
         terminalWidth={terminalWidth}
         renderMarkdown={renderMarkdown}
       />
-      <Box marginBottom={1}>
+      <Box
+        marginTop={isAlternateBuffer ? 0 : 1}
+        marginBottom={isAlternateBuffer ? 1 : 0}
+      >
         <ShowMoreLines
           constrainHeight={availableTerminalHeight !== undefined}
         />

packages/cli/src/ui/components/messages/ToolGroupMessage.tsx

@@ -260,9 +260,7 @@ export const ToolGroupMessage: React.FC<ToolGroupMessageProps> = ({
         )
       }
       {(borderBottomOverride ?? true) && visibleToolCalls.length > 0 && (
-        <Box paddingX={1}>
-          <ShowMoreLines constrainHeight={constrainHeight} />
-        </Box>
+        <ShowMoreLines constrainHeight={constrainHeight} />
       )}
     </Box>
   );