fix(web-ui): display all human-facing timestamps in Asia/Jerusalem (deterministic)

Storage stays UTC (DB TIMESTAMPTZ, API ISO-UTC) — only the display layer is
localized, and now deterministically: every timestamp renders pinned to
Asia/Jerusalem via a single Intl-based formatter, so SSR (UTC container) and
the browser agree on any runtime. No layout/visible-format change — only the tz.

- New single date formatter web-ui/src/lib/format-date.ts (G2): formatDate /
  formatDateShort / formatDateLong / formatDateTime / formatDateTimeFull /
  formatTime / formatIsoDate + Israel helpers getIsraelYear / israelDayKey /
  israelMidnightMs / israelParts + formatRelative (long/short/tight wording).
- Routed all ad-hoc toLocaleDateString/toLocaleTimeString/toLocaleString +
  hand-rolled new Date(...).get*() / toISOString().slice(0,10) timestamp call
  sites (30 files) through it. Number toLocaleString left untouched.
- Spec: added INV-UI9 to docs/spec/X6 (UTC storage, Asia/Jerusalem display).

Display-only; no layout/design/IA change → Claude Design gate N/A.
Invariants: G2 (single date formatter, no parallel ad-hoc formatting), INV-UI9.

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

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

@@ -26,6 +26,7 @@ import {
 } from "@/components/ui/select";
 import type { GraphFacets } from "@/lib/api/graph";
 import type { ColorBy, SizeBy } from "@/components/graph/graph-canvas";
+import { getIsraelYear } from "@/lib/format-date";
 
 export type GraphControls = {
   practiceArea: string;
@@ -51,7 +52,7 @@ const ALL = "__all__";
 // 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 CURRENT_YEAR = getIsraelYear(new Date()) ?? new Date().getFullYear();
 const YEARS = Array.from(
   { length: CURRENT_YEAR - YEAR_FLOOR + 1 },
   (_, i) => CURRENT_YEAR - i,