fix: console output to stderr for clean --json output

- Change Console() to Console(stderr=True) so all status/progress
  messages go to stderr, keeping stdout pure JSON when --json is used
- Add missing exception handling in likes command for fetch_user
- Fix SKILL.md: favorite -> favorites (correct command name)

SKILL.md

@@ -32,7 +32,7 @@ twitter feed
 twitter feed -t following
 
 # Bookmarks
-twitter favorite
+twitter favorites
 
 # User profile and posts
 twitter user <screen_name>
@@ -55,7 +55,7 @@ Filtering is opt-in (disabled by default). Enable with `--filter`.
 
 ```bash
 twitter feed --filter
-twitter favorite --filter
+twitter favorites --filter
 ```
 
 The scoring formula: