Add `dws chat toolbar` command group with shared helpers and 4 basic
subcommands for managing conversation shortcut bar visibility and order.
- toolbar_helpers.go: shared utilities (hasIntersection, isSystemBusy,
parseExtension, toolbarConversationID, toolbarNewSystemBusyError)
- toolbar_helpers_test.go: unit tests for shared helpers
- toolbar.go: command group entry assembling 7 subcommands
- toolbar_list.go: list shortcut entries (read/low)
- toolbar_add.go: add entries to visible area (write/low)
- toolbar_hide.go: hide entries from visible area (write/low)
- toolbar_sort.go: sort entries with intersection validation and
SYSTEM_BUSY error handling (write/low)
- chat.go: mount newChatToolbarCommand() to chat root
长真
4dbfaa4cef