shape-timeline.ts renders multiple tracks side-by-side via a CSS-grid
wrapper (one column per available track). The pre-Slice-3 single-column
flow is reused per column — each track keeps its own past / today /
future / undated structure and its own lookahead toggle. On ≤640px the
grid collapses to a single column with track sub-headers preserved so
the user knows which track they're reading.
A [Track ▼] selector surfaces above the timeline whenever the response
advertises more than the default "parent" track (read from the new
X-Projection-Tracks header). Options: "Beide" (default — render every
track in parallel) / "Nur Hauptverfahren" / "Nur Widerklage". The
filter is purely client-side, so swapping tracks doesn't re-fetch.
Visual treatment: parent track gets the lime accent; counterclaim track
takes the muted surface-2 background so the lawyer reads "this is the
defended side" at a glance; parent_context track is dashed-bordered and
faded to signal the read-only context view.
The previously-disabled "Widerklage (CCR) — kommt mit Slice 3" button
in the "+ Eintrag" modal is enabled and now opens an inline form with
proceeding-type select (defaulted to UPC_REV; populated lazily on first
open from /api/proceeding-types-db), optional title + CCR case-number,
and a "Stimmt nicht?" toggle for the R.49.2.b CCI edge case. POSTs to
/api/projects/{id}/counterclaim and navigates to the new child page on
success.
i18n: 30 keys (15 DE + 15 EN) under projects.detail.smarttimeline.track.*
+ projects.detail.smarttimeline.counterclaim.*. CSS: ~100 lines for the
grid wrapper, per-track visual modifiers, mobile collapse media query,
and the track-chip styling.
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