PAINTROID-701: Addition of Tooltips (#42)

* Add tooltips

* Address requested changes

Author: bhav-khurana

lib/ui/drawing_space/bottom_brush_tool_options.dart

@@ -57,12 +57,14 @@ class _BottomBrushToolOptionsState
           spacing: 8,
           children: [
             CustomActionChip(
+              hint: 'Round stroke',
               chipIcon: const Icon(Icons.circle),
               onPressed: () =>
                   _changeActionChipBackgroundColor(StrokeCap.round),
               chipBackgroundColor: _roundChipBackgroundColor,
             ),
             CustomActionChip(
+              hint: 'Square stroke',
               chipIcon: const Icon(Icons.square),
               onPressed: () =>
                   _changeActionChipBackgroundColor(StrokeCap.square),

lib/ui/landing_page/custom_action_button.dart

@@ -4,12 +4,14 @@ class CustomActionButton extends StatelessWidget {
   final String heroTag;
   final IconData icon;
   final VoidCallback onPressed;
+  final String hint;
 
   const CustomActionButton({
     Key? key,
     required this.heroTag,
     required this.icon,
     required this.onPressed,
+    required this.hint,
   }) : super(key: key);
 
   @override
@@ -18,6 +20,7 @@ class CustomActionButton extends StatelessWidget {
       heroTag: heroTag,
       backgroundColor: const Color(0xFFFFAB08),
       foregroundColor: const Color(0xFFFFFFFF),
+      tooltip: hint,
       child: Icon(icon),
       onPressed: () async => onPressed(),
     );

lib/ui/landing_page/landing_page.dart

@@ -161,6 +161,7 @@ class _LandingPageState extends ConsumerState<LandingPage> {
           CustomActionButton(
             heroTag: 'import_image',
             icon: Icons.file_download,
+            hint: 'Load image',
             onPressed: () async {
               final bool imageLoaded =
                   await ioHandler.loadImage(context, this, false);
@@ -175,6 +176,7 @@ class _LandingPageState extends ConsumerState<LandingPage> {
           CustomActionButton(
             heroTag: 'new_image',
             icon: Icons.add,
+            hint: 'New image',
             onPressed: () async {
               _clearCanvas();
               _navigateToPocketPaint();

lib/ui/shared/custom_action_chip.dart

@@ -7,12 +7,14 @@ class CustomActionChip extends StatelessWidget {
   final Color chipBackgroundColor;
   final EdgeInsetsGeometry? padding;
   final MaterialTapTargetSize? materialTapTargetSize;
+  final String hint;
 
   const CustomActionChip({
     super.key,
     required this.chipIcon,
     required this.onPressed,
     required this.chipBackgroundColor,
+    required this.hint,
     this.shape,
     this.padding,
     this.materialTapTargetSize,
@@ -21,6 +23,7 @@ class CustomActionChip extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return ActionChip(
+      tooltip: hint,
       label: chipIcon,
       onPressed: onPressed,
       shape: shape ??