feat(ui): אינדיקטור התקדמות לחילוץ מטא-דאטה + מתג-מקטעים בספריית הפסיקה

שתי בעיות UX בדף /precedents:

1. חילוץ מטא-דאטה לא נתן שום אינדיקציה שהוא רץ. בניגוד לחילוץ טקסט/הלכות
   (extraction_status / halacha_extraction_status) למטא-דאטה היתה רק חותמת-זמן
   metadata_extraction_requested_at — אין מצב "processing", לכן StatusPill לא
   הציג כלום. נוספה עמודת metadata_extraction_status ('pending'|'processing'|
   'completed'|'failed') במתכונת העמודות הקיימות, וה-worker
   (process_pending_extractions + reextract_metadata) מעדכן אותה: processing
   בתחילת פריט, completed בסיום (מנקה גם את החותמת), pending בכשל (לריטריי).
   ה-UI מציג תג "מחלץ מטא-דאטה" + באנר מונה-אצווה עם אחוז התקדמות (high-water-mark
   של עומק-התור) שמתעדכן אוטומטית דרך ה-polling הקיים (5ש').

2. שתי טבלאות מוערמות (בתי משפט / ועדות ערר) חייבו גלילה ארוכה. הוחלפו במתג-
   מקטעים — טבלה אחת בכל פעם, עם שמירה על העמודות הייעודיות לכל סוג.

Invariants: G2 (מרחיב מנגנון-סטטוס קיים, לא מסלול מקביל), INV-TOOL4/GAP-45
(המשך חשיפת תור-החילוץ הסמוי). אין נגיעה בתוכן משפטי (G11).

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

mcp-server/src/legal_mcp/services/precedent_library.py

@@ -235,6 +235,12 @@ async def process_pending_extractions(kind: str = "metadata", limit: int = 20) -
         attempts = 0
         result: dict = {}
         try:
+            # Flip to 'processing' so the UI badge shows live progress while
+            # this row is being worked (metadata has no per-chunk status of
+            # its own — this is the only signal). Halacha already sets its own
+            # 'processing' inside the extractor.
+            if kind == "metadata":
+                await db.set_case_law_metadata_status(cid, "processing")
             result = await _run_once(cid)
             # Retry only on systematic extraction failure (rate-limit storm).
             # Don't retry on 'no_halachot' — that means Claude looked and
@@ -259,9 +265,15 @@ async def process_pending_extractions(kind: str = "metadata", limit: int = 20) -
             # Finalise: success or terminal failure both clear the request
             # so the queue moves on. (Use 'failed' DB state for terminal
             # extraction_failed so the UI shows the warning chip.)
-            if kind == "halacha" and result.get("status") == "extraction_failed":
-                await db.set_case_law_halacha_status(cid, "failed")
-            await db.clear_extraction_request(cid, kind=kind)
+            if kind == "halacha":
+                if result.get("status") == "extraction_failed":
+                    await db.set_case_law_halacha_status(cid, "failed")
+                await db.clear_extraction_request(cid, kind=kind)
+            else:
+                # metadata — set terminal 'completed' status (also clears the
+                # request timestamp) so the UI badge settles instead of
+                # lingering on 'processing'.
+                await db.set_case_law_metadata_status(cid, "completed")
             processed += 1
             results.append({
                 "case_law_id": str(cid),
@@ -273,6 +285,15 @@ async def process_pending_extractions(kind: str = "metadata", limit: int = 20) -
             })
         except Exception as e:
             logger.exception("process_pending_extractions failed for %s: %s", cid, e)
+            # Don't clear the request — it stays for the next run. But for
+            # metadata, revert the badge from 'processing' back to 'pending'
+            # (the timestamp is preserved) so the row shows "בתור" rather than
+            # a stuck "מחלץ" until the retry picks it up.
+            if kind == "metadata":
+                try:
+                    await db.set_case_law_metadata_status(cid, "pending")
+                except Exception:
+                    logger.exception("failed to revert metadata status for %s", cid)
             results.append({
                 "case_law_id": str(cid),
                 "case_number": row.get("case_number", ""),
@@ -280,7 +301,6 @@ async def process_pending_extractions(kind: str = "metadata", limit: int = 20) -
                 "error": str(e),
                 "retry_attempts": attempts,
             })
-            # Don't clear the request — it stays for the next run.
 
     return {
         "status": "completed",
@@ -314,12 +334,18 @@ async def reextract_metadata(
         raise ValueError("precedent not found")
     # See note in db.request_metadata_extraction — opened to all source kinds.
 
+    # Mark 'processing' so a concurrent UI poll shows the live badge.
+    await db.set_case_law_metadata_status(case_law_id, "processing")
     await progress("extracting_metadata", 40, "מחלץ מטא-דאטה (תקציר, תגיות)")
     result = await precedent_metadata_extractor.extract_and_apply(case_law_id)
-    # Clear the queue timestamp so the UI / worker stop showing this row.
-    # See note in reextract_halachot.
+    # Settle to terminal 'completed' (also NULLs the queue timestamp) so the
+    # UI / worker stop showing this row. See note in reextract_halachot.
     if result.get("status") in ("completed", "no_changes"):
-        await db.clear_extraction_request(case_law_id, kind="metadata")
+        await db.set_case_law_metadata_status(case_law_id, "completed")
+    else:
+        # e.g. 'no_metadata' (no full_text) — don't leave the badge stuck on
+        # 'processing'; revert to 'pending' (preserves any queue timestamp).
+        await db.set_case_law_metadata_status(case_law_id, "pending")
     fields = result.get("fields") or []
     msg = (
         f"מולאו {len(fields)} שדות: {', '.join(fields)}"