feat: dedicated hook panel

[neumie]

Summary

• Move hook terminals from the layout tree into a dedicated toggleable panel below the terminal area (same pattern as the service panel)
• Auto-opens when hooks fire, auto-closes when all hooks succeed, stays open on failures
• Track hook command exit codes via OSC title sequence so terminals stay interactive while status updates correctly
• UX: trash icon for dismiss, refresh icon for rerun (always visible, dimmed while running), chevron-down for hide, "Clear finished" batch action
• Hooks group in sidebar defaults to collapsed; sidebar no longer auto-expands when hooks appear

Test plan

• Add an on_worktree_create hook in settings, create a quick worktree — hook panel should auto-open
• When hook command finishes, status dot should update (green=success, red=fail)
• On success, panel auto-closes; on failure, panel stays open
• Rerun button replays the hook command in the same interactive terminal
• Dismiss (trash icon) removes individual hooks; "Clear finished" removes all completed
• Hide (chevron-down) collapses panel without destroying hooks
• Sidebar hook group is collapsed by default for new projects

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