Layers the anchor / focus interactivity on top of T1's shell per
design §6.1–§6.5:
- Click-to-pin (📌) on every node with a real rule_id sets the anchor.
Clicking the already-anchored pin un-pins. URL state ?event=<id>.
- Anchored node renders with a "── DU BIST HIER ──" divider beneath
its meta line + the lime left-band styling. The find-header summary
surfaces "Anker: <name>" so the user can confirm where they are.
- Fokus chip (🔍) on the anchored node toggles zoom (?zoom=1). Zoom
renders the anchor's parent chain as a breadcrumb at the top of the
proceeding card and renders only the anchored subtree below. A
"{n} weitere Schritte verborgen" footer reports what zoom hid.
- Multi-proceeding scope (§6.5): when an anchor is pinned and >1
proceeding is visible, non-anchored proceedings auto-collapse to a
one-line header card with a [zeigen] / [ausblenden] toggle. The
user's explicit expansions persist for the current anchor; pinning
a different node clears them.
- Auto-pinning from the search input (T1's single-hit behaviour) now
routes through onAnchorChanged so the multi-proc scope kicks in
consistently.
Anchor + zoom state writes through history.replaceState — sharable URL.
Un-pinning clears zoom and restores the full multi-proceeding view
automatically (lastAnchor tracking).
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