feat: TUI Key & Snippet Management - Task 19

- KeyListTab: view/add/edit/delete SSH keys (Ctrl+K from host list)
- KeyFormTab: add/edit key form with name, type, private key, passphrase
- SnippetListTab: view/add/edit/delete snippets (Ctrl+P from host list)
- SnippetFormTab: add/edit snippet form with name, command, description, tags
- Updated status bar with new hints
- Save/delete commands for both key pairs and snippets

pkg/tui/messages.go

@@ -55,6 +55,118 @@ type loadedHostsMsg struct {
 	hosts []*models.Host
 }
 
+// Key management messages
+type openKeyListMsg struct{}
+
+type openKeyFormMsg struct {
+	editing *models.KeyPair
+}
+
+type saveKeyMsg struct {
+	key     *models.KeyPair
+	dataDir string
+}
+
+type saveKeyResultMsg struct {
+	key *models.KeyPair
+	err error
+}
+
+type deleteKeyMsg struct {
+	id      string
+	dataDir string
+}
+
+type deleteKeyResultMsg struct {
+	err error
+}
+
+// Snippet management messages
+type openSnippetListMsg struct{}
+
+type openSnippetFormMsg struct {
+	editing *models.Snippet
+}
+
+type saveSnippetMsg struct {
+	snippet *models.Snippet
+	dataDir string
+}
+
+type saveSnippetResultMsg struct {
+	snippet *models.Snippet
+	err     error
+}
+
+type deleteSnippetMsg struct {
+	id      string
+	dataDir string
+}
+
+type deleteSnippetResultMsg struct {
+	err error
+}
+
+// saveKeyCmd creates a command that saves a key pair to storage
+func saveKeyCmd(key *models.KeyPair, dataDir string) tea.Cmd {
+	return func() tea.Msg {
+		store, err := storage.NewJSONStorage(dataDir)
+		if err != nil {
+			return saveKeyResultMsg{err: err}
+		}
+		ctx := context.Background()
+		if err := store.SaveKeyPair(ctx, key); err != nil {
+			return saveKeyResultMsg{err: err}
+		}
+		return saveKeyResultMsg{key: key}
+	}
+}
+
+// deleteKeyCmd creates a command that deletes a key pair
+func deleteKeyCmd(id, dataDir string) tea.Cmd {
+	return func() tea.Msg {
+		store, err := storage.NewJSONStorage(dataDir)
+		if err != nil {
+			return deleteKeyResultMsg{err: err}
+		}
+		ctx := context.Background()
+		if err := store.DeleteKeyPair(ctx, id); err != nil {
+			return deleteKeyResultMsg{err: err}
+		}
+		return deleteKeyResultMsg{}
+	}
+}
+
+// saveSnippetCmd creates a command that saves a snippet to storage
+func saveSnippetCmd(snippet *models.Snippet, dataDir string) tea.Cmd {
+	return func() tea.Msg {
+		store, err := storage.NewJSONStorage(dataDir)
+		if err != nil {
+			return saveSnippetResultMsg{err: err}
+		}
+		ctx := context.Background()
+		if err := store.SaveSnippet(ctx, snippet); err != nil {
+			return saveSnippetResultMsg{err: err}
+		}
+		return saveSnippetResultMsg{snippet: snippet}
+	}
+}
+
+// deleteSnippetCmd creates a command that deletes a snippet
+func deleteSnippetCmd(id, dataDir string) tea.Cmd {
+	return func() tea.Msg {
+		store, err := storage.NewJSONStorage(dataDir)
+		if err != nil {
+			return deleteSnippetResultMsg{err: err}
+		}
+		ctx := context.Background()
+		if err := store.DeleteSnippet(ctx, id); err != nil {
+			return deleteSnippetResultMsg{err: err}
+		}
+		return deleteSnippetResultMsg{}
+	}
+}
+
 // saveHostCmd creates a command that saves a host to storage
 func saveHostCmd(host *models.Host, dataDir string) tea.Cmd {
 	return func() tea.Msg {