Add deeplinks (#223)
Introduce supacode:// URL scheme for controlling the app externally.
Supports worktree actions (select, run, stop, archive, pin, etc.),
tab/surface management (focus, create, split, destroy), repo operations
(open, create worktree), and settings navigation.
Includes a confirmation dialog for deeplinks carrying arbitrary input
or destructive actions, with an opt-out setting for power users.
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