Perfect! I've successfully refactored the code to have a common jumplist.go file with all the shared structs and methods. This eliminates code duplication across platforms. Here's what the refactoring accomplished:

## Summary of Refactoring

### 1. **Common File** (`jumplist.go`)
- Contains all shared structs: `JumpListItemType`, `JumpListItem`, `JumpListCategory`, and `JumpList`
- Implements common methods: `AddCategory()`, `ClearCategories()`, and `Apply()`
- The `Apply()` method calls the platform-specific `applyPlatform()` method

### 2. **Platform-Specific Files**
- **Windows** (`jumplist_windows.go`): Contains only Windows-specific implementation
  - COM interface definitions and implementations
  - `CreateJumpList()` method for windowsApp
  - `applyPlatform()` method with the actual Windows jumplist logic
  
- **macOS** (`jumplist_darwin.go`): Minimal stub implementation
  - `CreateJumpList()` method for darwinApp
  - `applyPlatform()` method that returns nil (no-op)
  
- **Linux** (`jumplist_linux.go`): Minimal stub implementation
  - `CreateJumpList()` method for linuxApp
  - `applyPlatform()` method that returns nil (no-op)

### Benefits
- **No code duplication**: All common structs and logic are in one place
- **Cleaner platform files**: Platform-specific files only contain platform-specific code
- **Easier maintenance**: Changes to the API only need to be made in one place
- **Type safety**: The common interface ensures all platforms implement the required methods

The API remains exactly the same for users, but the implementation is now much cleaner and more maintainable.

v3/pkg/application/jumplist.go

@@ -0,0 +1,55 @@
+package application
+
+// JumpListItemType represents the type of jump list item
+type JumpListItemType int
+
+const (
+	// JumpListItemTypeTask represents a task item
+	JumpListItemTypeTask JumpListItemType = iota
+	// JumpListItemTypeSeparator represents a separator (Windows only)
+	JumpListItemTypeSeparator
+)
+
+// JumpListItem represents a single item in a jump list
+type JumpListItem struct {
+	Type        JumpListItemType
+	Title       string
+	Description string
+	FilePath    string
+	Arguments   string
+	IconPath    string
+	IconIndex   int
+}
+
+// JumpListCategory represents a category of items in a jump list
+type JumpListCategory struct {
+	Name  string
+	Items []JumpListItem
+}
+
+// JumpList provides an interface for managing application jump lists.
+// This is primarily a Windows feature, but the API is designed to be
+// cross-platform safe (no-op on non-Windows platforms).
+type JumpList struct {
+	app        platformApp
+	categories []JumpListCategory
+}
+
+// AddCategory adds a category to the jump list.
+// If the category name is empty, the items will be added as tasks.
+func (j *JumpList) AddCategory(category JumpListCategory) {
+	j.categories = append(j.categories, category)
+}
+
+// ClearCategories removes all categories from the jump list.
+func (j *JumpList) ClearCategories() {
+	j.categories = []JumpListCategory{}
+}
+
+// Apply applies the current jump list configuration.
+// On Windows, this updates the taskbar jump list.
+// On other platforms, this is a no-op.
+func (j *JumpList) Apply() error {
+	// Platform-specific implementation
+	return j.applyPlatform()
+}

v3/pkg/application/jumplist_darwin.go

@@ -2,33 +2,6 @@
 
 package application
 
-type JumpListItemType int
-
-const (
-	JumpListItemTypeTask JumpListItemType = iota
-	JumpListItemTypeSeparator
-)
-
-type JumpListItem struct {
-	Type        JumpListItemType
-	Title       string
-	Description string
-	FilePath    string
-	Arguments   string
-	IconPath    string
-	IconIndex   int
-}
-
-type JumpListCategory struct {
-	Name  string
-	Items []JumpListItem
-}
-
-type JumpList struct {
-	app        *darwinApp
-	categories []JumpListCategory
-}
-
 func (app *darwinApp) CreateJumpList() *JumpList {
 	return &JumpList{
 		app:        app,
@@ -36,17 +9,7 @@ func (app *darwinApp) CreateJumpList() *JumpList {
 	}
 }
 
-func (j *JumpList) AddCategory(category JumpListCategory) {
-	// Stub implementation for macOS
-	j.categories = append(j.categories, category)
-}
-
-func (j *JumpList) ClearCategories() {
-	// Stub implementation for macOS
-	j.categories = []JumpListCategory{}
-}
-
-func (j *JumpList) Apply() error {
+func (j *JumpList) applyPlatform() error {
 	// Stub implementation for macOS
 	// Jump lists are Windows-specific, so this is a no-op on macOS
 	return nil

v3/pkg/application/jumplist_linux.go

@@ -2,33 +2,6 @@
 
 package application
 
-type JumpListItemType int
-
-const (
-	JumpListItemTypeTask JumpListItemType = iota
-	JumpListItemTypeSeparator
-)
-
-type JumpListItem struct {
-	Type        JumpListItemType
-	Title       string
-	Description string
-	FilePath    string
-	Arguments   string
-	IconPath    string
-	IconIndex   int
-}
-
-type JumpListCategory struct {
-	Name  string
-	Items []JumpListItem
-}
-
-type JumpList struct {
-	app        *linuxApp
-	categories []JumpListCategory
-}
-
 func (app *linuxApp) CreateJumpList() *JumpList {
 	return &JumpList{
 		app:        app,
@@ -36,17 +9,7 @@ func (app *linuxApp) CreateJumpList() *JumpList {
 	}
 }
 
-func (j *JumpList) AddCategory(category JumpListCategory) {
-	// Stub implementation for Linux
-	j.categories = append(j.categories, category)
-}
-
-func (j *JumpList) ClearCategories() {
-	// Stub implementation for Linux
-	j.categories = []JumpListCategory{}
-}
-
-func (j *JumpList) Apply() error {
+func (j *JumpList) applyPlatform() error {
 	// Stub implementation for Linux
 	// Jump lists are Windows-specific, so this is a no-op on Linux
 	return nil

v3/pkg/application/jumplist_windows.go

@@ -9,33 +9,6 @@ import (
 	"unsafe"
 )
 
-type JumpListItemType int
-
-const (
-	JumpListItemTypeTask JumpListItemType = iota
-	JumpListItemTypeSeparator
-)
-
-type JumpListItem struct {
-	Type        JumpListItemType
-	Title       string
-	Description string
-	FilePath    string
-	Arguments   string
-	IconPath    string
-	IconIndex   int
-}
-
-type JumpListCategory struct {
-	Name  string
-	Items []JumpListItem
-}
-
-type JumpList struct {
-	app        *windowsApp
-	categories []JumpListCategory
-}
-
 var (
 	modole32                          = syscall.NewLazyDLL("ole32.dll")
 	modshell32                        = syscall.NewLazyDLL("shell32.dll")
@@ -169,15 +142,13 @@ func (app *windowsApp) CreateJumpList() *JumpList {
 	}
 }
 
-func (j *JumpList) AddCategory(category JumpListCategory) {
-	j.categories = append(j.categories, category)
-}
+func (j *JumpList) applyPlatform() error {
+	// Type assert to get the windowsApp
+	app, ok := j.app.(*windowsApp)
+	if !ok {
+		return fmt.Errorf("invalid app type for Windows jumplist")
+	}
 
-func (j *JumpList) ClearCategories() {
-	j.categories = []JumpListCategory{}
-}
-
-func (j *JumpList) Apply() error {
 	hr := w32.CoInitializeEx(0, w32.COINIT_APARTMENTTHREADED)
 	if hr != w32.S_OK && hr != w32.S_FALSE {
 		return fmt.Errorf("CoInitializeEx failed: %v", hr)
@@ -197,7 +168,7 @@ func (j *JumpList) Apply() error {
 	}
 	defer pDestList.Release()
 
-	appID := w32.MustStringToUTF16Ptr(j.app.parent.options.Name)
+	appID := w32.MustStringToUTF16Ptr(app.parent.options.Name)
 	
 	hr = pDestList.SetAppID(appID)
 	if hr != w32.S_OK {