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/cases/decision-blocks-panel.tsx

@@ -17,6 +17,7 @@ import {
   type BlockStatus,
 } from "@/lib/api/decision-blocks";
 import { BLOCK_LABELS } from "@/lib/api/feedback";
+import { formatTime } from "@/lib/format-date";
 import { AlertTriangle, Pencil, FileText } from "lucide-react";
 
 /* ── status badge styling ─────────────────────────────── */
@@ -233,10 +234,7 @@ function SaveIndicator({ state }: { state: SaveState }) {
     return <span className="text-[0.72rem] text-ink-muted">⏳ שומר…</span>;
   }
   if (state.kind === "saved") {
-    const time = state.at.toLocaleTimeString("he-IL", {
-      hour: "2-digit",
-      minute: "2-digit",
-    });
+    const time = formatTime(state.at);
     return <span className="text-[0.72rem] text-success">✓ נשמר {time}</span>;
   }
   return <span className="text-[0.72rem] text-danger">⚠ {state.message}</span>;