Add saved searches with CRUD API and UI sidebar

Add extension field to search results and display it
Add active filter badges and save button to search header

backend/saved_searches.py

@@ -0,0 +1,71 @@
+"""
+Saved search definitions — persisted search queries with their active filters.
+
+Stored in data/saved_searches.json per user.
+"""
+
+import json
+import time
+import logging
+import shutil
+from pathlib import Path
+from typing import List, Dict, Any, Optional
+
+logger = logging.getLogger("obsigate.saved_searches")
+
+DATA_DIR = Path("data")
+
+
+def _get_file(username: str) -> Path:
+    DATA_DIR.mkdir(parents=True, exist_ok=True)
+    return DATA_DIR / f"{username}_saved_searches.json"
+
+
+def _read(file: Path) -> List[Dict[str, Any]]:
+    if not file.exists():
+        return []
+    try:
+        return json.loads(file.read_text(encoding="utf-8"))
+    except Exception:
+        return []
+
+
+def _write(file: Path, data: List[Dict[str, Any]]):
+    tmp = file.with_suffix(".tmp")
+    tmp.write_text(json.dumps(data, indent=2, ensure_ascii=False), encoding="utf-8")
+    shutil.move(str(tmp), str(file))
+
+
+def get_saved(username: str) -> List[Dict[str, Any]]:
+    return _read(_get_file(username))
+
+
+def save_search(username: str, definition: dict) -> dict:
+    """Save a search definition. Returns the saved entry."""
+    searches = _read(_get_file(username))
+
+    entry = {
+        "id": str(int(time.time() * 1000)),
+        "query": definition.get("query", ""),
+        "vault": definition.get("vault", "all"),
+        "case_sensitive": definition.get("case_sensitive", False),
+        "whole_word": definition.get("whole_word", False),
+        "regex": definition.get("regex", False),
+        "include_paths": definition.get("include_paths", ""),
+        "exclude_paths": definition.get("exclude_paths", ""),
+        "created_at": time.time(),
+    }
+    searches.insert(0, entry)
+    # Keep last 50
+    searches = searches[:50]
+    _write(_get_file(username), searches)
+    return entry
+
+
+def delete_saved(username: str, search_id: str) -> bool:
+    searches = _read(_get_file(username))
+    new_list = [s for s in searches if s["id"] != search_id]
+    if len(new_list) == len(searches):
+        return False
+    _write(_get_file(username), new_list)
+    return True