Add ticket time tracking with reports and entry management.

Support start/stop timer, manual durations, grouped reports, and per-ticket edit/delete of time entries with undo.

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

internal/command/time_cmds.go

@@ -0,0 +1,81 @@
+package command
+
+import (
+	"context"
+	"fmt"
+
+	"task/internal/ticket"
+)
+
+// AddTimeEntry creates a time entry; Undo deletes it.
+type AddTimeEntry struct {
+	Store   ticket.TimeStore
+	Entry   ticket.TimeEntry
+	created ticket.TimeEntry
+}
+
+func (c *AddTimeEntry) Name() string { return "add time entry" }
+
+func (c *AddTimeEntry) Execute(ctx context.Context) error {
+	_ = ctx
+	created, err := c.Store.Create(c.Entry)
+	if err != nil {
+		return err
+	}
+	c.created = created
+	c.Entry = created
+	return nil
+}
+
+func (c *AddTimeEntry) Undo(ctx context.Context) error {
+	_ = ctx
+	id := c.created.ID
+	if id == "" {
+		id = c.Entry.ID
+	}
+	if id == "" {
+		return fmt.Errorf("add time undo: missing entry id")
+	}
+	return c.Store.Delete(id)
+}
+
+// RemoveTimeEntry deletes a time entry; Undo restores the snapshot.
+type RemoveTimeEntry struct {
+	Store    ticket.TimeStore
+	Snapshot ticket.TimeEntry
+}
+
+func (c *RemoveTimeEntry) Name() string { return "remove time entry" }
+
+func (c *RemoveTimeEntry) Execute(ctx context.Context) error {
+	_ = ctx
+	if c.Snapshot.ID == "" {
+		return fmt.Errorf("remove time: missing entry id")
+	}
+	return c.Store.Delete(c.Snapshot.ID)
+}
+
+func (c *RemoveTimeEntry) Undo(ctx context.Context) error {
+	_ = ctx
+	_, err := c.Store.Create(c.Snapshot)
+	return err
+}
+
+// UpdateTimeEntry applies a new entry state; Undo restores Before.
+type UpdateTimeEntry struct {
+	Store  ticket.TimeStore
+	Before ticket.TimeEntry
+	After  ticket.TimeEntry
+}
+
+func (c *UpdateTimeEntry) Name() string { return "update time entry" }
+
+func (c *UpdateTimeEntry) Execute(ctx context.Context) error {
+	_ = ctx
+	return c.Store.Update(c.After)
+}
+
+func (c *UpdateTimeEntry) Undo(ctx context.Context) error {
+	_ = ctx
+	return c.Store.Update(c.Before)
+}