feat: Add Diff View and File History Tracking

- Implemented a new Diff view in the Workbench to track file changes
- Added file history tracking with version control and change tracking
- Created a FileModifiedDropdown to browse and manage modified files
- Enhanced ActionRunner to support file history persistence
- Updated Workbench and BaseChat components to support new diff view functionality
- Added support for inline and side-by-side diff view modes

app/components/chat/BaseChat.tsx

@@ -34,6 +34,7 @@ import ChatAlert from './ChatAlert';
 import type { ModelInfo } from '~/lib/modules/llm/types';
 import ProgressCompilation from './ProgressCompilation';
 import type { ProgressAnnotation } from '~/types/context';
+import type { ActionRunner } from '~/lib/runtime/action-runner';
 
 const TEXTAREA_MIN_HEIGHT = 76;
 
@@ -67,6 +68,7 @@ interface BaseChatProps {
   actionAlert?: ActionAlert;
   clearAlert?: () => void;
   data?: JSONValue[] | undefined;
+  actionRunner?: ActionRunner;
 }
 
 export const BaseChat = React.forwardRef<HTMLDivElement, BaseChatProps>(
@@ -101,6 +103,7 @@ export const BaseChat = React.forwardRef<HTMLDivElement, BaseChatProps>(
       actionAlert,
       clearAlert,
       data,
+      actionRunner,
     },
     ref,
   ) => {
@@ -303,7 +306,7 @@ export const BaseChat = React.forwardRef<HTMLDivElement, BaseChatProps>(
         data-chat-visible={showChat}
       >
         <ClientOnly>{() => <Menu />}</ClientOnly>
-        <div className="flex flex-col lg:flex-row overflow-y-auto w-full h-full">
+        <div ref={scrollRef} className="flex flex-col lg:flex-row overflow-y-auto w-full h-full">
           <div className={classNames(styles.Chat, 'flex flex-col flex-grow lg:min-w-[var(--chat-min-width)] h-full')}>
             {!chatStarted && (
               <div id="intro" className="mt-[16vh] max-w-chat mx-auto text-center px-4 lg:px-0">
@@ -317,40 +320,39 @@ export const BaseChat = React.forwardRef<HTMLDivElement, BaseChatProps>(
             )}
             <div
               className={classNames('pt-6 px-2 sm:px-6', {
-                'h-full flex flex-col pb-4 overflow-y-auto': chatStarted,
+                'h-full flex flex-col': chatStarted,
               })}
               ref={scrollRef}
             >
               <ClientOnly>
                 {() => {
                   return chatStarted ? (
-                    <div className="flex-1 w-full max-w-chat pb-6 mx-auto z-1">
-                      <Messages
-                        ref={messageRef}
-                        className="flex flex-col "
-                        messages={messages}
-                        isStreaming={isStreaming}
-                      />
-                    </div>
+                    <Messages
+                      ref={messageRef}
+                      className="flex flex-col w-full flex-1 max-w-chat pb-6 mx-auto z-1"
+                      messages={messages}
+                      isStreaming={isStreaming}
+                    />
                   ) : null;
                 }}
               </ClientOnly>
               <div
-                className={classNames('flex flex-col gap-4 w-full max-w-chat mx-auto z-prompt', {
+                className={classNames('flex flex-col gap-4 w-full max-w-chat mx-auto z-prompt mb-6', {
                   'sticky bottom-2': chatStarted,
-                  'position-absolute': chatStarted,
                 })}
               >
-                {actionAlert && (
-                  <ChatAlert
-                    alert={actionAlert}
-                    clearAlert={() => clearAlert?.()}
-                    postMessage={(message) => {
-                      sendMessage?.({} as any, message);
-                      clearAlert?.();
-                    }}
-                  />
-                )}
+                <div className="bg-bolt-elements-background-depth-2">
+                  {actionAlert && (
+                    <ChatAlert
+                      alert={actionAlert}
+                      clearAlert={() => clearAlert?.()}
+                      postMessage={(message) => {
+                        sendMessage?.({} as any, message);
+                        clearAlert?.();
+                      }}
+                    />
+                  )}
+                </div>
                 {progressAnnotations && <ProgressCompilation data={progressAnnotations} />}
                 <div
                   className={classNames(
@@ -584,16 +586,15 @@ export const BaseChat = React.forwardRef<HTMLDivElement, BaseChatProps>(
                 </div>
               </div>
             </div>
-            {!chatStarted && (
-              <div className="flex flex-col justify-center mt-6 gap-5">
+            <div className="flex flex-col justify-center gap-5">
+              {!chatStarted && (
                 <div className="flex justify-center gap-2">
-                  <div className="flex items-center gap-2">
-                    {ImportButtons(importChat)}
-                    <GitCloneButton importChat={importChat} className="min-w-[120px]" />
-                  </div>
+                  {ImportButtons(importChat)}
+                  <GitCloneButton importChat={importChat} />
                 </div>
-
-                {ExamplePrompts((event, messageInput) => {
+              )}
+              {!chatStarted &&
+                ExamplePrompts((event, messageInput) => {
                   if (isStreaming) {
                     handleStop?.();
                     return;
@@ -601,11 +602,18 @@ export const BaseChat = React.forwardRef<HTMLDivElement, BaseChatProps>(
 
                   handleSendMessage?.(event, messageInput);
                 })}
-                <StarterTemplates />
-              </div>
-            )}
+              {!chatStarted && <StarterTemplates />}
+            </div>
           </div>
-          <ClientOnly>{() => <Workbench chatStarted={chatStarted} isStreaming={isStreaming} />}</ClientOnly>
+          <ClientOnly>
+            {() => (
+              <Workbench
+                actionRunner={actionRunner ?? ({} as ActionRunner)}
+                chatStarted={chatStarted}
+                isStreaming={isStreaming}
+              />
+            )}
+          </ClientOnly>
         </div>
       </div>
     );