feat: #34 citation graph + #32 wide-modal precedent edit + #13 verify

## #34 — Daphna's internal citation graph

New schema V16 (V15 was already used by proceeding_type): table
``precedent_internal_citations`` (source→cited, with cited_case_law_id
nullable for citations whose target isn't in the corpus yet) + 3
indexes (source, target, unlinked).

New service ``citation_extractor.py`` with regex patterns for ערר /
בל"מ / עע"מ / בר"מ / עמ"נ / ע"א / בג"ץ / רע"א — accepts both ``\/``
and ``-`` separators, requires actual parenthesized district label
to avoid greedy mid-paragraph captures. Resolves citations against
``case_law.case_number`` substring; default confidence 0.90 linked,
0.75 unlinked. ON CONFLICT DO NOTHING on (source, cited_case_number).

3 new MCP tools: ``extract_internal_citations``,
``list_internal_citations``, ``list_incoming_citations``. Optional
flag ``include_cited_by=True`` on ``search_internal_decisions``
appends cited-by candidates as ``match_type='cited_by'`` stubs.

Bulk-extracted from 40 internal_committee rows authored by דפנה תמיר:
**353 distinct citations, 348 stored, 96 linked / 252 unlinked**.
Top citers: 1079/24 (30), 1024/24 (19), 1009/25 (18). Top unlinked
target: ע"א 3213/97 (cited 5x) — natural #35 candidates.

## #32 — Wide-modal precedent edit

`precedent-edit-sheet.tsx`: ``<Sheet side="left">`` → centered
``<Dialog>`` with ``sm:max-w-4xl`` ``max-h-[90vh]`` ``overflow-y-auto``.
Component API unchanged so existing callers
(`/precedents/[id]/page.tsx`, `library-list-panel.tsx`) work as-is.
RTL preserved. Mobile falls back to near-full-width via shadcn default.

## #13 — 403/17 verification

`case_law e151fc25-...` (אהרון ברק - תכנית רחביה) already in perfect
shape after Stage A work: all metadata fields populated, 351 halachot
with avg_conf=0.864 (well above 0.78 threshold). No re-extraction
needed; closing task as verified.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web-ui/src/components/precedents/precedent-edit-sheet.tsx

@@ -4,8 +4,8 @@ import { useState } from "react";
 import { Save, Sparkles } from "lucide-react";
 import { toast } from "sonner";
 import {
-  Sheet, SheetContent, SheetHeader, SheetTitle, SheetDescription,
-} from "@/components/ui/sheet";
+  Dialog, DialogContent, DialogHeader, DialogTitle, DialogDescription,
+} from "@/components/ui/dialog";
 import { Button } from "@/components/ui/button";
 import { Input } from "@/components/ui/input";
 import { Label } from "@/components/ui/label";
@@ -136,17 +136,20 @@ export function PrecedentEditSheet({ caseLawId, onOpenChange }: Props) {
   };
 
   return (
-    <Sheet open={open} onOpenChange={(o) => { if (!o) onOpenChange(false); }}>
-      <SheetContent side="left" className="w-full sm:max-w-2xl overflow-y-auto" dir="rtl">
-        <SheetHeader>
-          <SheetTitle className="text-navy">עריכת פרטי פסיקה</SheetTitle>
-          <SheetDescription className="text-ink-muted">
+    <Dialog open={open} onOpenChange={(o) => { if (!o) onOpenChange(false); }}>
+      <DialogContent
+        className="sm:max-w-4xl max-h-[90vh] overflow-y-auto p-0"
+        dir="rtl"
+      >
+        <DialogHeader className="px-6 pt-6">
+          <DialogTitle className="text-navy">עריכת פרטי פסיקה</DialogTitle>
+          <DialogDescription className="text-ink-muted">
             כל השדות ניתנים לעריכה חוץ ממראה המקום (מזהה ייחודי).
             כפתור &quot;חלץ מטא-דאטה&quot; שולח בקשה לתור מקומי שאני מרוקן
             מ-Claude Code (ה-LLM רץ מקומית עם <code>claude session</code>,
             לא ב-API).
-          </SheetDescription>
-        </SheetHeader>
+          </DialogDescription>
+        </DialogHeader>
 
         {isPending || !record ? (
           <div className="px-6 pb-6 mt-4 space-y-3">
@@ -317,7 +320,7 @@ export function PrecedentEditSheet({ caseLawId, onOpenChange }: Props) {
           </div>
           </>
         )}
-      </SheetContent>
-    </Sheet>
+      </DialogContent>
+    </Dialog>
   );
 }