refactor: fix remaining code review issues on kabi-use

- _get_client: remove useless try/except that re-raised same error
- verify_cookies: increase timeout from 3s to 5s
- fetch_user: use _deep_get for URL extraction (consistent with
  _parse_user_result)
- formatter: remove no-op tweets_to_json wrapper and unused import
- _as_int/_as_float: filter.py now imports from config.py (dedup)
- CLI read commands: extract _fetch_and_display() to dedup
  favorite/search/likes/list_timeline
- _write_action: move load_config inside try block
- auth.py: add PEP 8 blank line after logger

twitter_cli/formatter.py

@@ -7,8 +7,6 @@ from rich.console import Console
 from rich.panel import Panel
 from rich.table import Table
 
-from .serialization import tweets_to_json as _tweets_to_json
-
 
 def format_number(n):
     # type: (int) -> str
@@ -161,13 +159,6 @@ def print_filter_stats(original_count, filtered, console=None):
             "   Score range: %.1f ~ %.1f" % (bottom_score, top_score)
         )
 
-
-def tweets_to_json(tweets):
-    # type: (List[Tweet]) -> str
-    """Export tweets as JSON string."""
-    return _tweets_to_json(tweets)
-
-
 def print_user_profile(user, console=None):
     # type: (UserProfile, Optional[Console]) -> None
     """Print user profile as a rich panel."""