path_ui_design

Summary

Entry points:
- Activity bar: " Path to … " on focus hero when a second idea is pinned or selected ( manual_context + selection_pane ).
- Ideas Summary graph tab: shift-click two nodes to set endpoints.
- Command palette: `Reqlan: Find path between requirements`.
Presentation ( sidebar-first ):
- Collapsed: summaryLine under the scope footprint line.
- Expanded: vertical stepper ( breadcrumb ) with edge kind labels; optional overlay on graph_library highlighting only path edges / nodes.
- When no path: show closest partial path or " no connection within N hops " with expand-in-Summary action.
Performance:
- BFS / bidirectional BFS on sqlite edge tables via local_graph_analysis — never materialise full workspace graph.
- Debounce endpoint changes; cache last path per `(from,to,depth)` revision tied to index catalog generation.

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