refactor: dynamic UA matching, session reuse, score Optional, --output on all commands

- constants.py: sync_chrome_version() aligns UA/sec-ch-ua with impersonate target
- auth.py: reuse shared cffi session instead of creating duplicate
- filter.py: eliminate double weight building in score_tweet
- models.py: Tweet.score → Optional[float] for accurate display
- cli.py: add --output to search/likes/user-posts for consistency

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "twitter-cli"
-version = "0.4.3"
+version = "0.4.4"
 description = "A CLI for Twitter/X — feed, bookmarks, and user timeline in terminal"
 readme = "README.md"
 license = "Apache-2.0"