feat(search): add content-finding filters, saved searches, and text quality to Search view

- Add tags, sender, text_quality filters to search API and Meilisearch client
- Add sender and ocr_text_length to Meilisearch filterable attributes
- Expand saved search allowed filter keys to include q, document_type, language, sender, text_quality
- Add filters panel and saved searches UI to the Search view template
- Add tests for new search filters, saved search keys, and search view elements

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

app/api/saved_searches.py

@@ -23,10 +23,14 @@ router = APIRouter(prefix="/saved-searches", tags=["saved-searches"])
 
 DbSession = Annotated[Session, Depends(get_db)]
 
-# Allowed filter keys that can be saved
+# Allowed filter keys that can be saved.
+# Files-view keys: search, mime_type, status, storage_provider, sort_by, sort_order
+# Search-view keys: q, document_type, language, sender, text_quality
+# Shared keys: tags, date_from, date_to
 ALLOWED_FILTER_KEYS = frozenset(
     {
         "search",
+        "q",
         "mime_type",
         "status",
         "date_from",
@@ -35,6 +39,10 @@ ALLOWED_FILTER_KEYS = frozenset(
         "tags",
         "sort_by",
         "sort_order",
+        "document_type",
+        "language",
+        "sender",
+        "text_quality",
     }
 )