- Add word-level highlighting using LCS algorithm for edit diffs
- Match diff colors to explorer sidebar (GitHub-style rgba backgrounds)
- Use discriminated union for tool call parsing (shell, edit, generic)
- Add horizontal scroll for bash/command output instead of wrapping
- Remove status badge from bottom sheet header
- Fix sheet snap points (60%/95%) and disable dynamic sizing
- Add min-width to diff viewer for full-width backgrounds
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