feat: add unicode-aware soft-wrap modes and wrapped rendering (#8)

* feat(textarea): add unicode-aware soft-wrap modes and wrapped rendering

- add WrapMode API/state: None, Word, Glyph, WordOrGlyph
- keep None behavior unchanged (horizontal scroll)
- implement wrapped render path with logical-to-visual row mapping
- add Unicode-aware wrapping via unicode-segmentation + unicode-width
- make wrap width tab-aware to prevent hidden text
- apply cursor-line style on wrapped continuation rows
- fix selection at soft-wrap boundaries (no synthetic highlighted space)
- add wrap-focused tests for long text, newlines, tabs, tiny widths, and line-number
    continuations

* chore(release): bump to v0.9.0 and update README/CHANGELOG

Cargo.toml

@@ -3,7 +3,7 @@ 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 = "0.8.0"
+version = "0.9.0"
 edition = "2021"
 rust-version = "1.56.1" # for `tui` crate support
 authors = ["Simon Peter Rothgang <simonrothgang@icloud.com>", "rhysd <lin90162@yahoo.co.jp>"]
@@ -53,6 +53,7 @@ termion-15 = { package = "termion", version = "1.5", optional = true }
 termwiz = { version = "0.23.0", optional = true }
 tui = { version = "0.19", default-features = false, optional = true }
 unicode-width = "0.2.0"
+unicode-segmentation = "1.10.1"
 serde = { version = "1", optional = true , features = ["derive"] }
 
 [[example]]