windows-reactor add properties for pane length/footer and text box appearance

[kennykerr]

Adds the missing WinUI properties requested in #4669 and #4671.

NavigationView gains open_pane_length(f64) (declarative, via winui.toml) and pane_footer(impl Into<Element>), which mounts arbitrary content in the pane's footer slot (reusing the existing pane_element reconciler path — distinct from the built-in settings_visible gear).

TextBox gains border_brush/border_thickness builders, mirroring Border (direct Color or theme-ref).

To support this, the backend's BorderBrush/BorderThickness dispatch is generalized from Border-only to any Control via a single IControl cast — matching the existing set_background/set_foreground pattern — plus a Color::transparent() helper for borderless inputs. Covered by two new automated tests and two runnable samples (navigation_view_pane, text_box_border); fmt/clippy/test_reactor clean and tool_reactor regen is idempotent.

Two new samples to validate:

cargo run -p reactor_samples --example navigation_view_pane   # open_pane_length + pane_footer
cargo run -p reactor_samples --example text_box_border        # border brush/thickness + transparent input

[Copilot]

Pull request overview

Adds missing WinUI 3 surface area to windows-reactor (notably NavigationView pane configuration and TextBox border styling) by extending the generated WinUI property set and generalizing border prop dispatch through IControl, with accompanying tests and samples.

Changes:

• Add NavigationView::open_pane_length(f64) (via winui.toml/generated bindings) and NavigationView::pane_footer(Element) mounted through the existing pane-slot reconciler path.
• Add TextBox::border_brush(BrushBinding) and TextBox::border_thickness(Thickness) and route BorderBrush/BorderThickness through a generalized IControl fallback in the WinUI backend.
• Add tests validating the new props and add runnable samples demonstrating the new APIs.

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
docs/crates/windows-reactor.md	Documents the backend dispatch behavior for background/foreground/border props.
crates/tools/reactor/src/winui.toml	Adds NavigationView.OpenPaneLength to codegen inputs.
crates/tools/reactor/src/generated.txt	Regenerated reactor interface/property inventory to include OpenPaneLength.
crates/tools/reactor/src/base.txt	Adds IControl setters for BorderBrush/BorderThickness and INavigationView.put_PaneFooter.
crates/tests/libs/reactor/tests/controls_shell.rs	Adds a test for NavigationView open pane length and pane footer mounting.
crates/tests/libs/reactor/tests/controls_input.rs	Adds a test for TextBox border brush/thickness prop emission.
crates/tests/libs/reactor_selftest/src/bindings.rs	Regenerated selftest WinUI bindings (adds IControl border setters and INavigationView footer/open pane length).
crates/samples/reactor/samples/examples/text_box_border.rs	New sample showcasing TextBox border customization.
crates/samples/reactor/samples/examples/navigation_view_pane.rs	New sample showcasing NavigationView open pane length and pane footer.
crates/libs/reactor/src/widgets/text_box.rs	Adds border_brush/border_thickness fields + builders and emits the new props.
crates/libs/reactor/src/widgets/navigation_view.rs	Adds open_pane_length and pane_footer and exposes footer via pane_element().
crates/libs/reactor/src/style.rs	Adds Color::transparent() helper.
crates/libs/reactor/src/generated.rs	Regenerated widget-to-prop bindings to emit Prop::OpenPaneLength for NavigationView.
crates/libs/reactor/src/bindings.rs	Regenerated WinUI bindings (adds IControl border setters and INavigationView footer/open pane length).
crates/libs/reactor/src/backend/winui/mod.rs	Generalizes border brush/thickness dispatch via IControl; wires NavigationView pane slot to SetPaneFooter.
crates/libs/reactor/src/backend/winui/generated_set_prop.rs	Adds OpenPaneLength dispatch for Handle::NavigationView.

[Copilot]

Pull request overview

Copilot reviewed 19 out of 19 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 19 out of 19 changed files in this pull request and generated no new comments.