Feature: Batch saved-list scraping via CLI and library

[MozzamShahid]

File / lines: src/gmaps_scraper/scraper.py (scrape_saved_list); src/gmaps_scraper/cli.py (lines 495-498)

Problem: The saved-list workflow is strictly single-URL. scrape_saved_list() takes one URL, and the CLI errors if len(args.urls) != 1 and rejects --input for --kind list. Users with many lists must write their own wrapper, while the place workflow already supports batch input, session reuse, staggered starts, and retries.

Suggested fix:

1. Add scrape_saved_lists(urls, *, max_concurrency=1, stagger_ms=0, ...) that reuses HttpSessionConfig / BrowserSessionConfig across calls (mirroring scrape_places).
2. In the CLI, accept multiple URLs or --input when --kind list.
3. Emit a {"results": [...]} envelope like place batch mode.
4. Add tests for batch list scraping and input file handling.

Example:

printf %s\n LIST_URL_1 LIST_URL_2 | uv run gmaps-scraper --kind list --input -

Difficulty: medium
Impact: Medium — expands a core workflow and improves parity with place scraping.