v0.4.0

Signed and notarized Ghosthub 0.4.0 for Apple Silicon.

• Source commit: a9211e98a95a0f0b7236639e55c8e193a42572e0

• Embedded kwt revision: 8110e94d4e4e11ec09b43527dc4d78ad4ccb47b8

• Existing local and remote branches can be selected when creating a
  worktree, including source-qualified choices when multiple remotes contain
  the same branch name.

• Non-primary worktrees can be removed from the sidebar with confirmation.
  Ghosthub terminates a verified live tmux session before delegating removal
  to kwt, while preserving the Git branch.

• Experimental native Windows hosts can connect over SSH through psmux,
  discover and attach sessions, and install revision-pinned Windows kwt
  helpers.

• Project and worktree nesting is clearer in the sidebar, and registered
  primary checkouts open normally even when they live outside kwt's global
  worktree directory.

• Standalone tmux sessions use a direct hover removal control, while
  worktree-backed sessions keep distinct session and worktree lifecycle
  actions.

• Tmux Theme colors apply automatically only to new sessions created by
  Ghosthub. Existing local and remote sessions retain their own appearance
  unless Apply theme to shared tmux sessions is enabled.

• Development builds show the nearest release tag, commit distance, revision,
  and dirty state in About while preserving valid numeric macOS bundle
  versions.

• Closing or disconnecting a tmux attachment no longer implies that the
  server-side session ended. When a bare session does end, Ghosthub offers to
  reopen that exact named session.

• Generated terminal configuration is self-contained and reload failures are
  reported without showing misleading errors after successful automatic
  reloads.

• Worktree creation, removal, and inventory refreshes are coordinated across
  windows so stale rows and sessions do not reappear after mutations.