fix: re-render page image on demand if /tmp wiped after restart

requirements.txt

@@ -11,3 +11,4 @@ openpyxl>=3.1
 pymupdf>=1.23.0
 surya-ocr>=0.4.0
 Pillow>=10.0.0
+pymupdf>=1.23

smoke_signal_tab.py

@@ -709,7 +709,7 @@ def run_ocr() -> tuple:
     if df.empty:
         return _ocr_status_html(), debug + "No sources. Complete Steps 1-2 first."
 
-    eligible = df[df["status"] == "profiled"]
+    eligible = df[df["status"].isin(["profiled", "ocred", "rendered"])]
     if eligible.empty:
         return _ocr_status_html(), debug + "No profiled PDFs. Complete Step 2 first."
 
@@ -934,6 +934,29 @@ def get_review_item(idx: int) -> tuple:
         candidate = SS_ROOT / crop_path
         if candidate.exists():
             img_path = str(candidate)
+        else:
+            # /tmp wiped after restart — re-render page from PDF on demand
+            try:
+                import fitz
+                book_id = item.get("book_id","")
+                page_num = int(item.get("page", 1))
+                pdf_path = SOURCE_DIR / f"{book_id}.pdf"
+                if not pdf_path.exists():
+                    # try original filename from manifest
+                    mdf = pd.read_csv(MANIFEST_CSV)
+                    row = mdf[mdf["book_id"] == book_id]
+                    if not row.empty:
+                        pdf_path = SOURCE_DIR / row.iloc[0]["filename"]
+                if pdf_path.exists():
+                    candidate.parent.mkdir(parents=True, exist_ok=True)
+                    doc = fitz.open(str(pdf_path))
+                    pg = doc[page_num - 1]
+                    pix = pg.get_pixmap(dpi=150)
+                    pix.save(str(candidate))
+                    doc.close()
+                    img_path = str(candidate)
+            except Exception:
+                img_path = None
 
     info = (f"<div style='font-family:monospace;font-size:11px;color:var(--ss-muted)'>"
             f"{item['book_id']} · page {item['page']} · "