feat: Fix flickering in iTerm + scrolling + performance issues.

- Refactors history display using Ink's <Static> component to prevent flickering and improve performance by rendering completed items statically.
- Introduces ConsolePatcher component to capture and display console.log, console.warn, and console.error output within the Ink UI, addressing native handling issues.
- Introduce a new content splitting mechanism to work better for static items. Basically when content gets too long we will now split content into multiple blocks for Gemini messages to ensure that we can statically cache larger pieces of history.

Fixes:
- https://b.corp.google.com/issues/411450097
- https://b.corp.google.com/issues/412716309

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

@@ -13,12 +13,14 @@ import { ToolConfirmationMessage } from './ToolConfirmationMessage.js';
 import { Colors } from '../../colors.js';
 
 interface ToolGroupMessageProps {
+  groupId: number;
   toolCalls: IndividualToolCallDisplay[];
   onSubmit: (value: PartListUnion) => void;
 }
 
 // Main component renders the border and maps the tools using ToolMessage
 export const ToolGroupMessage: React.FC<ToolGroupMessageProps> = ({
+  groupId,
   toolCalls,
   onSubmit,
 }) => {
@@ -29,13 +31,23 @@ export const ToolGroupMessage: React.FC<ToolGroupMessageProps> = ({
 
   return (
     <Box
+      key={groupId}
       flexDirection="column"
       borderStyle="round"
+      /*
+        This width constraint is highly important and protects us from an Ink rendering bug.
+        Since the ToolGroup can typically change rendering states frequently, it can cause
+        Ink to render the border of the box incorrectly and span multiple lines and even
+        cause tearing.
+      */
+      width="100%"
+      marginLeft={1}
       borderDimColor={hasPending}
       borderColor={borderColor}
+      marginBottom={1}
     >
       {toolCalls.map((tool) => (
-        <React.Fragment key={tool.callId}>
+        <Box key={groupId + '-' + tool.callId} flexDirection="column">
           <ToolMessage
             key={tool.callId} // Use callId as the key
             callId={tool.callId} // Pass callId
@@ -52,7 +64,7 @@ export const ToolGroupMessage: React.FC<ToolGroupMessageProps> = ({
                 onSubmit={onSubmit}
               ></ToolConfirmationMessage>
             )}
-        </React.Fragment>
+        </Box>
       ))}
       {/* Optional: Add padding below the last item if needed,
                 though ToolMessage already has some vertical space implicitly */}