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### What problem does this PR solve? Partially addresses #14362 by adding deleted-file sync support for the Dropbox data source. Dropbox previously did not provide the slim current-file snapshot required by stale document reconciliation, and its sync runner returned only document batches. As a result, enabling deleted-file sync could not remove local documents that had been deleted from Dropbox. This PR: - Adds `retrieve_all_slim_docs_perm_sync()` to `DropboxConnector`. - Reuses Dropbox metadata traversal to collect current remote file IDs without downloading file contents. - Wires incremental Dropbox sync to return `(document_generator, file_list)` when `sync_deleted_files` is enabled. - Enables the deleted-file sync toggle for Dropbox in the data source settings UI. - Adds regression coverage for slim snapshots, nested folders, paginated listings, duplicate filenames, and full reindex behavior. Tests: - `uv run pytest test/unit_test/common/test_dropbox_connector.py -q` - `uv run pytest test/unit_test/rag/test_sync_data_source.py -q` - `uv run pytest test/unit_test/common/test_dropbox_connector.py test/unit_test/rag/test_sync_data_source.py -q` - `uv run ruff check common/data_source/dropbox_connector.py rag/svr/sync_data_source.py test/unit_test/common/test_dropbox_connector.py test/unit_test/rag/test_sync_data_source.py` - `./node_modules/.bin/eslint src/pages/user-setting/data-source/constant/index.tsx` ### Type of change - [x] New Feature (non-breaking change which adds functionality)