Replace bare Exception catch with specific exception types:
- json.JSONDecodeError for invalid JSON
- TypeError, KeyError, ValueError for malformed messages
- OSError for I/O errors
Addresses REFACTORING.md item about narrowing WebSocket error handling.
Replaces simple carriage return handling with pyte terminal emulator
to properly interpret all ANSI escape sequences including cursor
positioning. This fixes the tmux status bar 'creeping up' issue in
screenshots.
Adds pyte dependency to pyproject.toml.
Resolves TODO item #2.
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