chore: migrate to Rust 2024 edition and bump to v0.9.2 (#12)

* chore: migrate to Rust 2024 edition and bump to v0.9.2

- Bump edition to 2024 and rust-version to 1.85.0
- Replace f64::log10 with usize::ilog10 in num_digits
- Fix clippy lints surfaced by edition bump: repeat_n, derived Default, then_some
- Expand watch-check and watch-test aliases to cover all feature paths (crossterm_0_28, no-backend, tuirs variants, serde, arbitrary)
- Expand CI test and clippy workflows to full 6/8-entry feature matrices including termion on Ubuntu
- Apply rustfmt import reordering from edition 2024 rules

* fix: revert turis linux checks

Cargo.toml

@@ -3,9 +3,9 @@ name = "tui-textarea-2"
 homepage = "https://github.com/srothgan/tui-textarea#readme"
 repository = "https://github.com/srothgan/tui-textarea"
 documentation = "https://docs.rs/tui-textarea-2/latest/tui_textarea/"
-version = "0.9.1"
-edition = "2021"
-rust-version = "1.56.1" # for `tui` crate support
+version = "0.9.2"
+edition = "2024"
+rust-version = "1.85.0" # for Rust 2024 edition support
 authors = ["Simon Peter Rothgang <simonrothgang@icloud.com>", "rhysd <lin90162@yahoo.co.jp>"]
 description = """
 tui-textarea is a simple yet powerful text editor widget for ratatui and tui-rs. Multi-line