Refactor ChatInputField to Support Continuous Mode

- Added a new boolean state `isContinuousMode` to the `ChatInputField` widget to handle the continuous mode feature.
- Introduced a new callback function `onContinuousModePressed` to manage the state of the continuous mode from an external source.
- Conditionally rendered the send button based on the `isContinuousMode` state.
- Enhanced the UI by adding a button to toggle between continuous mode and single message mode, which triggers the `onContinuousModePressed` callback.

frontend/lib/views/chat/chat_input_field.dart

@@ -3,10 +3,14 @@ import 'package:flutter/material.dart';
 class ChatInputField extends StatefulWidget {
   // Callback to be triggered when the send button is pressed
   final Function(String) onSendPressed;
+  final Function() onContinuousModePressed;
+  final bool isContinuousMode;
 
   const ChatInputField({
     Key? key,
     required this.onSendPressed,
+    required this.onContinuousModePressed,
+    this.isContinuousMode = false,
   }) : super(key: key);
 
   @override
@@ -49,6 +53,8 @@ class _ChatInputFieldState extends State<ChatInputField> {
           // when the content exceeds its maximum height
           child: SingleChildScrollView(
             reverse: true,
+            // TODO: Deselect text field after user goes into continous mode
+            // TODO: Include tool tip to explain clicking text field will end continuous mode
             child: TextField(
               controller: _controller,
               // Allowing the TextField to expand vertically and accommodate multiple lines
@@ -56,16 +62,35 @@ class _ChatInputFieldState extends State<ChatInputField> {
               decoration: InputDecoration(
                 hintText: 'Type a message...',
                 border: InputBorder.none,
-                suffixIcon: IconButton(
-                  splashRadius: 0.1,
-                  icon: const Icon(Icons.send),
-                  onPressed: () {
-                    // TODO: We allow empty messages?
-                    if (_controller.text.isNotEmpty) {
-                      widget.onSendPressed(_controller.text);
-                      _controller.clear();
-                    }
-                  },
+                suffixIcon: Row(
+                  mainAxisSize: MainAxisSize.min, // Set to minimum space
+                  children: [
+                    if (!widget.isContinuousMode)
+                      // TODO: Include tool tip to explain single message sending
+                      IconButton(
+                        splashRadius: 0.1,
+                        icon: const Icon(Icons.send),
+                        onPressed: () {
+                          widget.onSendPressed(_controller.text);
+                          _controller.clear();
+                        },
+                      ),
+                    // TODO: Include tool tip to explain continuous mode
+                    // TODO: Include pop up to explain continuous mode reprecussions
+                    IconButton(
+                      splashRadius: 0.1,
+                      icon: Icon(widget.isContinuousMode
+                          ? Icons.pause
+                          : Icons.fast_forward),
+                      onPressed: () {
+                        if (!widget.isContinuousMode) {
+                          widget.onSendPressed(_controller.text);
+                          _controller.clear();
+                        }
+                        widget.onContinuousModePressed();
+                      },
+                    )
+                  ],
                 ),
               ),
             ),