ratatui_ruby v0.5.0 released

I am happy to announce the release of ratatui_ruby v0.5.0.

This release brings the Frame API.
You now control exactly where widgets render.
Hit testing no longer requires duplicating layout logic.

What is new:

* **Frame API.**
  `RatatuiRuby.draw { |frame| ... }` yields a Frame object.
  Call `frame.render_widget(widget, rect)` to place widgets precisely.
  Calculate layout once. Store the rects. Check clicks against them later.
  The legacy `draw(tree)` API still works.

* **Mouse Injection.**
  New test helpers simulate mouse input.
  `inject_mouse` handles coordinates, buttons, and modifiers.
  `inject_click`, `inject_right_click`, and `inject_drag` cover common cases.

* **Snapshot Testing.**
  `assert_screen_matches` compares the terminal against golden files.
  Store expected output. Detect visual regressions automatically.

* **Session Convenience Methods.**
  Session now wraps `Layout.split`, `Constraint.percentage`, and other schema class methods.
  Write `layout_split(...)` instead of `Layout.split(...)` inside `RatatuiRuby.run` blocks.

* **Event::None.**
  `poll_event` returns `Event::None` when the queue is empty.
  This null-object responds `false` to all event predicates.
  Check `event.none?` or pattern-match on `type: :none`.

* **Example Viewer.**
  Browse example source code directly in the documentation.
  Every widget page links to runnable demos with syntax highlighting.

Breaking changes:
- `poll_event` returns `Event::None` instead of `nil` when no event is available. Update loops to check `!event.none?`.

Read the full changelog:
https://git.sr.ht/~kerrick/ratatui_ruby/tree/v0.5.0/item/CHANGELOG.md

Gem: https://rubygems.org/gems/ratatui_ruby
Source: https://git.sr.ht/~kerrick/ratatui_ruby