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/config.toml

@@ -1,3 +1,3 @@
 [alias]
-watch-check = ["watch", "--why", "-x", "clippy --features=search,termwiz --examples --tests", "-x", "clippy --features tuirs-crossterm,search --no-default-features --examples --tests"]
-watch-test = ["watch", "--why", "-x", "test --features=search,termwiz", "-w", "src", "-w", "tests"]
+watch-check = ["watch", "--why", "-x", "clippy --features=search,termwiz,serde,arbitrary --examples --tests", "-x", "clippy --no-default-features --features=crossterm_0_28,search,serde,arbitrary --examples --tests", "-x", "clippy --no-default-features --features=no-backend,search,serde,arbitrary --examples --tests", "-x", "clippy --no-default-features --features=tuirs-crossterm,search,serde,arbitrary --examples --tests", "-x", "clippy --no-default-features --features=tuirs-no-backend,search,serde,arbitrary --examples --tests"]
+watch-test = ["watch", "--why", "-x", "test --features=search,termwiz,serde,arbitrary", "-x", "test --no-default-features --features=crossterm_0_28,search,serde,arbitrary", "-x", "test --no-default-features --features=tuirs-crossterm,search,serde,arbitrary", "-w", "src", "-w", "tests"]