tlc: fix all 49 clippy warnings (0 remaining)
Systematic clippy sweep across 22 files:
- Remove unused imports (Modifier, Block, Borders, Clear, Line)
- Remove unnecessary mut/unused variables (cursor.rs, mc_skin.rs)
- Fix unnecessary casts in popup.rs and viewer/mod.rs
- Use abs_diff instead of manual abs pattern (render.rs)
- Collapse nested if in menubar.rs
- Merge identical if branches in render.rs
- Use strip_prefix instead of manual slice (mod.rs)
- Use io::Error::other instead of Error::new (source.rs)
- Remove useless format! in known_hosts.rs
- Add #[derive(Default)] to SelectionMode enum
- Add #[allow] for too_many_arguments on render functions
- Add #[allow(dead_code)] for utility functions (centered_rect, rgb)
- Remove redundant .clone() on &str in menubar.rs
- Remove .max(0) on unsigned subtraction (button.rs)
- Add missing doc comments on public methods (editor, panel, ops)
cargo clippy --lib: 0 warnings (was 49)
cargo test --lib: 1213 passed, 0 failed
vasilito
4e3b06af83