feat: add automatic clipboard copy functionality

- Add clipboard library (github.com/atotto/clipboard v0.1.4)
- Auto-copy generated commit message to clipboard
- Show success feedback: '📋 Commit message copied to clipboard!'
- Graceful error handling if clipboard access fails
- Users can immediately paste with Ctrl+V/Cmd+V

Author: DFanso

go.mod

@@ -21,6 +21,7 @@ require (
 	cloud.google.com/go/auth/oauth2adapt v0.2.7 // indirect
 	cloud.google.com/go/compute/metadata v0.6.0 // indirect
 	cloud.google.com/go/longrunning v0.5.7 // indirect
+	github.com/atotto/clipboard v0.1.4 // indirect
 	github.com/containerd/console v1.0.5 // indirect
 	github.com/felixge/httpsnoop v1.0.4 // indirect
 	github.com/go-logr/logr v1.4.2 // indirect

go.sum

@@ -28,6 +28,8 @@ github.com/MarvinJWendt/testza v0.4.2/go.mod h1:mSdhXiKH8sg/gQehJ63bINcCKp7RtYew
 github.com/MarvinJWendt/testza v0.5.2 h1:53KDo64C1z/h/d/stCYCPY69bt/OSwjq5KpFNwi+zB4=
 github.com/MarvinJWendt/testza v0.5.2/go.mod h1:xu53QFE5sCdjtMCKk8YMQ2MnymimEctc4n3EjyIYvEY=
 github.com/atomicgo/cursor v0.0.1/go.mod h1:cBON2QmmrysudxNBFthvMtN32r3jxVRIvzkUiF/RuIk=
+github.com/atotto/clipboard v0.1.4 h1:EH0zSVneZPSuFR11BlR9YppQTVDbh5+16AmcJi4g1z4=
+github.com/atotto/clipboard v0.1.4/go.mod h1:ZY9tmq7sm5xIbd9bOK4onWV4S6X0u6GY7Vn0Yu86PYI=
 github.com/containerd/console v1.0.3/go.mod h1:7LqA/THxQ86k76b8c/EMSiaJ3h1eZkMkXar0TQ1gf3U=
 github.com/containerd/console v1.0.5 h1:R0ymNeydRqH2DmakFNdmjR2k0t7UPuiOV/N/27/qqsc=
 github.com/containerd/console v1.0.5/go.mod h1:YynlIjWYF8myEu6sdkwKIvGQq+cOckRm6So2avqoYAk=

src/main.go

@@ -8,6 +8,7 @@ import (
 	"path/filepath"
 	"strings"
 
+	"github.com/atotto/clipboard"
 	"github.com/dfanso/commit-msg/src/chatgpt"
 	"github.com/dfanso/commit-msg/src/gemini"
 	"github.com/dfanso/commit-msg/src/grok"
@@ -132,6 +133,14 @@ func main() {
 	// Display the commit message in a styled panel
 	displayCommitMessage(commitMsg)
 
+	// Copy to clipboard
+	err = clipboard.WriteAll(commitMsg)
+	if err != nil {
+		pterm.Warning.Printf("⚠️  Could not copy to clipboard: %v\n", err)
+	} else {
+		pterm.Success.Println("📋 Commit message copied to clipboard!")
+	}
+
 	pterm.Println()
 
 	// Display changes preview