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chore: Release 4.0.0 (#216)

## Summary

- Major release of tui-realm bumping all crates (`tuirealm`,
`tui-realm-stdlib`, `tuirealm_derive`, `tui-realm-textarea`,
`tui-realm-treeview`) to **4.0.0**
- Upgrades to `ratatui` 0.30 and Rust edition 2024 (MSRV 1.88)
- Numerous breaking API changes — see `docs/en/migrating-4.0.md` for the
migration guide

## Highlights

- `MockComponent` → `Component`, old `Component` → `AppComponent`;
`#[derive(Component)]` reflects the rename
- Root-level re-exports removed: all types imported via module paths
- `TextSpan` / title tuple / `TerminalBridge` replaced with
ratatui-native primitives and backend-specific adapters
- `Poll` and `PollAsync` return `PortResult` with `PortError`; new
`PollStrategy::UpTo` semantics; timeout moved to `PollStrategy`
- `PropPayload` / `State` `Tup*` variants removed; `One` → `Single`,
`Tup2` → `Pair`; new `::Any` variant for arbitrary data
- `Alignment` split into `AlignmentHorizontal` / `AlignmentVertical`
- `textarea` drops the `clipboard` feature in favor of a `paste`
function
- `Update` trait removed; update routines are plain functions
- Release-prep housekeeping: single root `CHANGELOG.md` generated via
`git-cliff`, per-crate changelogs removed, READMEs/doc comments updated
to `4.x`, 32 rustdoc warnings fixed

## Test plan

- [x] `cargo +nightly fmt --all -- --check`
- [x] `cargo clippy --workspace --all-targets --all-features --
-Dwarnings`
- [x] `cargo test --workspace --all-features`
- [x] `cargo doc --workspace --all-features --no-deps` (0 warnings)
- [ ] Manual smoke of examples (`demo`, `async-ports`, stdlib examples)
- [ ] `cargo publish --dry-run` for each crate in dependency order

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