feat(precedents): formal citation per Israeli citation rules + copy/edit UI

Until now, "case_number" was the only stored identifier for a precedent.
But a *citation per the Israeli unified citation rules* is a different
beast — it has bold parties, an unbold prefix (court abbrev + panel/
district parenthetical + case number), and an unbold trailing reporter
(נבו / פ"ד...).  Without storing it as a first-class field we couldn't
hand the chair a one-click "copy as citation" experience for pasting
into decisions.

Changes:
- Schema V19: case_law.citation_formatted TEXT (Markdown — parties
  wrapped in **…** so the copy helper can render <strong> for Word/Docs
  paste and keep plain-text fallback meaningful).
- Metadata extractor: composes citation_formatted from the document
  text per the unified citation rules, with worked examples for ע"א /
  עת"מ / ערר / בל"מ in the prompt. Refuses to store half-formed strings.
- PATCH /api/precedent-library/{id} accepts citation_formatted so the
  chair can correct LLM mistakes.
- /precedents/[id]: dedicated "מראה מקום" block with bold rendering,
  a copy-to-clipboard button (text/html + text/plain so Word keeps
  the bolds), and an inline edit textarea.
- /precedents list rows: link displays the formatted citation when
  available, with a small inline copy button — falls back to the bare
  case_number for older rows.

Backfill of existing rows happens by re-stamping the extraction queue
once V19 has rolled out and the new field is reachable.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

web-ui/src/components/precedents/formatted-citation.tsx

@@ -0,0 +1,121 @@
+"use client";
+
+// Rendering helpers for the formal Israeli citation ("כללי הציטוט האחיד").
+//
+// Backend stores the citation as Markdown: parties' names wrapped in
+// **double asterisks**, everything else regular. These helpers:
+//   1. Render the citation with <strong> for the bold ranges.
+//   2. Copy it to the clipboard as BOTH text/html (so Word/Docs paste
+//      with bold preserved) and text/plain (which keeps the markers
+//      so the markdown survives a plain-text paste).
+
+import { useState } from "react";
+import { Check, Copy } from "lucide-react";
+import { toast } from "sonner";
+
+function parseSegments(md: string): Array<{ bold: boolean; text: string }> {
+  const out: Array<{ bold: boolean; text: string }> = [];
+  const re = /\*\*([^*]+)\*\*/g;
+  let last = 0;
+  let m: RegExpExecArray | null;
+  while ((m = re.exec(md)) !== null) {
+    if (m.index > last) out.push({ bold: false, text: md.slice(last, m.index) });
+    out.push({ bold: true, text: m[1] });
+    last = re.lastIndex;
+  }
+  if (last < md.length) out.push({ bold: false, text: md.slice(last) });
+  return out;
+}
+
+function escapeHtml(s: string): string {
+  return s
+    .replace(/&/g, "&amp;")
+    .replace(/</g, "&lt;")
+    .replace(/>/g, "&gt;")
+    .replace(/"/g, "&quot;");
+}
+
+export function FormattedCitation({
+  citation,
+  className,
+}: {
+  citation: string;
+  className?: string;
+}) {
+  const segments = parseSegments(citation);
+  return (
+    <span className={className} dir="rtl">
+      {segments.map((s, i) =>
+        s.bold ? (
+          <strong key={i} className="font-semibold">
+            {s.text}
+          </strong>
+        ) : (
+          <span key={i}>{s.text}</span>
+        ),
+      )}
+    </span>
+  );
+}
+
+export function CitationCopyButton({
+  citation,
+  size = "sm",
+}: {
+  citation: string;
+  size?: "sm" | "xs";
+}) {
+  const [copied, setCopied] = useState(false);
+
+  async function handleCopy() {
+    const segments = parseSegments(citation);
+    const html = segments
+      .map((s) =>
+        s.bold
+          ? `<strong>${escapeHtml(s.text)}</strong>`
+          : escapeHtml(s.text),
+      )
+      .join("");
+    const wrappedHtml = `<span dir="rtl">${html}</span>`;
+    try {
+      const cb = navigator.clipboard;
+      if (typeof ClipboardItem !== "undefined" && cb && "write" in cb) {
+        const item = new ClipboardItem({
+          "text/html": new Blob([wrappedHtml], { type: "text/html" }),
+          "text/plain": new Blob([citation], { type: "text/plain" }),
+        });
+        await cb.write([item]);
+      } else {
+        await cb.writeText(citation);
+      }
+      setCopied(true);
+      toast.success("המראה מקום הועתק (עם הדגשה לצדדים)");
+      window.setTimeout(() => setCopied(false), 1800);
+    } catch (err) {
+      console.error("citation copy failed", err);
+      toast.error("העתקה נכשלה");
+    }
+  }
+
+  const dims = size === "xs" ? "h-7 px-2 text-[0.72rem]" : "h-8 px-2.5 text-xs";
+  return (
+    <button
+      type="button"
+      onClick={handleCopy}
+      title="העתק לפי כללי הציטוט (עם הדגשה לצדדים)"
+      className={`inline-flex items-center gap-1 rounded-md border border-rule bg-surface hover:bg-rule-soft/50 text-ink ${dims}`}
+    >
+      {copied ? (
+        <>
+          <Check className="w-3.5 h-3.5 text-emerald-600" />
+          הועתק
+        </>
+      ) : (
+        <>
+          <Copy className="w-3.5 h-3.5" />
+          העתק
+        </>
+      )}
+    </button>
+  );
+}