Add offline-first task-master TUI with tickets, board lists, and undo.

Charm-based CLI with JSON persistence, status/list filters, external editor editing, command-history undo/redo, and glamour markdown without AutoStyle OSC hangs.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/config/config.go

@@ -0,0 +1,75 @@
+package config
+
+import "path/filepath"
+
+const (
+	AppName         = "task-master"
+	DefaultProject  = "inbox"
+	DefaultTheme    = "default"
+	configFileName  = "config.json"
+)
+
+// Config holds application settings persisted under ~/.config/task-master.
+type Config struct {
+	ActiveProject string            `json:"activeProject"`
+	DataDir       string            `json:"dataDir"`
+	Theme         string            `json:"theme"`
+	// ProjectLists maps project ID → board list id (all|backlog|in_progress|done).
+	ProjectLists map[string]string `json:"projectLists,omitempty"`
+}
+
+// Path returns the absolute path to the config file.
+func Path(home string) string {
+	return filepath.Join(home, ".config", AppName, configFileName)
+}
+
+// DefaultDataDir returns the default data directory under ~/.local/share.
+func DefaultDataDir(home string) string {
+	return filepath.Join(home, ".local", "share", AppName)
+}
+
+// Defaults returns a Config with sensible defaults for the given home directory.
+func Defaults(home string) Config {
+	return Config{
+		ActiveProject: DefaultProject,
+		DataDir:       DefaultDataDir(home),
+		Theme:         DefaultTheme,
+		ProjectLists:  map[string]string{},
+	}
+}
+
+// ApplyDefaults fills empty fields from defaults without overwriting set values.
+func (c *Config) ApplyDefaults(home string) {
+	d := Defaults(home)
+	if c.ActiveProject == "" {
+		c.ActiveProject = d.ActiveProject
+	}
+	if c.DataDir == "" {
+		c.DataDir = d.DataDir
+	}
+	if c.Theme == "" {
+		c.Theme = d.Theme
+	}
+	if c.ProjectLists == nil {
+		c.ProjectLists = map[string]string{}
+	}
+}
+
+// ActiveBoardList returns the persisted board list for a project (default: all).
+func (c *Config) ActiveBoardList(projectID string) string {
+	if c.ProjectLists == nil {
+		return "all"
+	}
+	if v, ok := c.ProjectLists[projectID]; ok && v != "" {
+		return v
+	}
+	return "all"
+}
+
+// SetActiveBoardList stores the board list for a project.
+func (c *Config) SetActiveBoardList(projectID, listID string) {
+	if c.ProjectLists == nil {
+		c.ProjectLists = map[string]string{}
+	}
+	c.ProjectLists[projectID] = listID
+}