terminal-screen: prefer OSC 7 for current working directoryHEADmaster

Use the current directory URI (set by the shell via OSC 7 escape
sequence) to determine the working directory for new tabs, instead of
reading /proc. This works inside tmux/screen/sudo, preserves symlink
components, and is consistent with other VTE-based terminal emulators.

The /proc-based detection is kept as a fallback for shells that don't
emit OSC 7 (e.g. vte.sh is not sourced). The initial working directory
is used as a final fallback, and the separate _with_fallback variant is
folded into the main function so all callers benefit from the complete
fallback chain.

Adapted from https://gitlab.gnome.org/GNOME/gnome-terminal/-/commit/cf3cad87

Fixes #195

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