fix(graph): lower year-filter floor to 1980, dynamic ceiling

The /graph "משנה / עד שנה" dropdown was hardcoded to 1994–2026, so dated
precedents below 1994 were unreachable by the year filter. After backfilling
decision dates, the corpus now has precedents from 1982 (ע"א 725/81), 1988
(910/86) and 1990 (בג"ץ 1578/90).

Floor → 1980 (covers the oldest); ceiling → current year via getFullYear()
so the range never ages out. Pure UI-logic change — same year_from/year_to
params, no new data path (G2), no backend touch.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web-ui/src/components/graph/graph-filter-panel.tsx

@@ -48,7 +48,14 @@ export type GraphControls = {
 };
 
 const ALL = "__all__";
-const YEARS = Array.from({ length: 2026 - 1994 + 1 }, (_, i) => 2026 - i);
+// Floor covers the oldest dated precedent in the corpus (currently ע"א 725/81 →
+// 1982); ceiling tracks the current year so the range never ages out.
+const YEAR_FLOOR = 1980;
+const CURRENT_YEAR = new Date().getFullYear();
+const YEARS = Array.from(
+  { length: CURRENT_YEAR - YEAR_FLOOR + 1 },
+  (_, i) => CURRENT_YEAR - i,
+);
 
 const COLOR_BY: { value: ColorBy; label: string }[] = [
   { value: "type", label: "סוג נקודה" },