Fix type annotation bugs and remove unused imports

This fixes issues introduced by the ruff commit e57f391a which converted
Optional[x] to x | None:

- Fixed datasette/app.py line 1024: Dict[id | str, Dict] -> Dict[int | str, Dict]
  (was using id built-in function instead of int type)
- Fixed datasette/app.py line 1074: Optional["Resource"] -> "Resource" | None
- Added 'from __future__ import annotations' for Python 3.10 compatibility
- Added TYPE_CHECKING blocks to avoid circular imports
- Removed dead code (unused variable assignments) from cli.py and views
- Removed unused imports flagged by ruff across multiple files
- Fixed test fixtures: moved app_client fixture imports to conftest.py
  (fixed 71 test errors caused by fixtures not being registered)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

tests/conftest.py

@@ -231,3 +231,27 @@ def ds_unix_domain_socket_server(tmp_path_factory):
     yield ds_proc, uds
     # Shut it down at the end of the pytest session
     ds_proc.terminate()
+
+
+# Import fixtures from fixtures.py to make them available
+from .fixtures import (  # noqa: E402, F401
+    app_client,
+    app_client_base_url_prefix,
+    app_client_conflicting_database_names,
+    app_client_csv_max_mb_one,
+    app_client_immutable_and_inspect_file,
+    app_client_larger_cache_size,
+    app_client_no_files,
+    app_client_returned_rows_matches_page_size,
+    app_client_shorter_time_limit,
+    app_client_two_attached_databases,
+    app_client_two_attached_databases_crossdb_enabled,
+    app_client_two_attached_databases_one_immutable,
+    app_client_with_cors,
+    app_client_with_dot,
+    app_client_with_trace,
+    generate_compound_rows,
+    generate_sortable_rows,
+    make_app_client,
+    TEMP_PLUGIN_SECRET_FILE,
+)

tests/test_api.py

@@ -1,6 +1,5 @@
 from datasette.app import Datasette
 from datasette.plugins import DEFAULT_PLUGINS
-from datasette.utils.sqlite import supports_table_xinfo
 from datasette.version import __version__
 from .fixtures import (  # noqa
     app_client,

tests/test_auth.py

@@ -1,5 +1,4 @@
 from bs4 import BeautifulSoup as Soup
-from .fixtures import app_client
 from .utils import cookie_was_deleted, last_event
 from click.testing import CliRunner
 from datasette.utils import baseconv

tests/test_canned_queries.py

@@ -2,7 +2,7 @@ from bs4 import BeautifulSoup as Soup
 import json
 import pytest
 import re
-from .fixtures import make_app_client, app_client
+from .fixtures import make_app_client
 
 
 @pytest.fixture

tests/test_cli.py

@@ -1,5 +1,4 @@
 from .fixtures import (
-    app_client,
     make_app_client,
     TestClient as _TestClient,
     EXPECTED_PLUGINS,

tests/test_crossdb.py

@@ -2,7 +2,6 @@ from datasette.cli import cli
 from click.testing import CliRunner
 import urllib
 import sqlite3
-from .fixtures import app_client_two_attached_databases_crossdb_enabled
 
 
 def test_crossdb_join(app_client_two_attached_databases_crossdb_enabled):

tests/test_html.py

@@ -1,4 +1,3 @@
-from asgi_csrf import Errors
 from bs4 import BeautifulSoup as Soup
 from datasette.app import Datasette
 from datasette.utils import allowed_pragmas

tests/test_internals_database.py

@@ -6,7 +6,6 @@ from datasette.app import Datasette
 from datasette.database import Database, Results, MultipleValues
 from datasette.utils.sqlite import sqlite3, sqlite_version
 from datasette.utils import Column
-from .fixtures import app_client, app_client_two_attached_databases_crossdb_enabled
 import pytest
 import time
 import uuid

tests/test_internals_datasette.py

@@ -3,7 +3,7 @@ Tests for the datasette.app.Datasette class
 """
 
 import dataclasses
-from datasette import Forbidden, Context
+from datasette import Context
 from datasette.app import Datasette, Database
 from datasette.resources import DatabaseResource
 from itsdangerous import BadSignature

tests/test_plugins.py

@@ -1,6 +1,5 @@
 from bs4 import BeautifulSoup as Soup
 from .fixtures import (
-    app_client,
     make_app_client,
     TABLES,
     TEMP_PLUGIN_SECRET_FILE,
@@ -9,7 +8,7 @@ from .fixtures import (
 )  # noqa
 from click.testing import CliRunner
 from datasette.app import Datasette
-from datasette import cli, hookimpl, Permission
+from datasette import cli, hookimpl
 from datasette.filters import FilterArguments
 from datasette.plugins import get_plugins, DEFAULT_PLUGINS, pm
 from datasette.permissions import PermissionSQL

tests/test_table_html.py

@@ -8,7 +8,7 @@ from .fixtures import (  # noqa
 import pathlib
 import pytest
 import urllib.parse
-from .utils import assert_footer_links, inner_html
+from .utils import inner_html
 
 
 @pytest.mark.asyncio