Date: 2026-03-02
Issue: #298
Scope: Graph-pane keyboard focus traversal baseline and accessible naming model hardening.

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• Graph canvas now participates in keyboard traversal when the graph widget has focus.
• Tab advances to the next graph node in deterministic NodeKey order.
• Shift+Tab moves to the previous graph node (with wrap-around).
• Traversal emits the same reducer-owned selection intent path as pointer selection (GraphAction::SelectNode with single-select semantics).

• Graph canvas now reports an explicit accessibility label via widget_info.
• Label includes focused node context when available:
  • Graph canvas. Focused node: {title-or-url}. Press Tab or Shift+Tab to move between nodes.
• Fallback label when nothing is focused:
  • Graph canvas. No node focused. Press Tab to focus the first node.

Naming source policy:

1. Node title when non-empty.
2. Node URL when title is empty.
3. Untitled node fallback when both are empty.

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• render::tests::keyboard_traversal_advances_and_wraps_in_deterministic_order
• render::tests::keyboard_traversal_reverse_wraps_to_last_when_unfocused
• render::tests::graph_canvas_accessibility_label_includes_focused_node_name

Executed targeted tests:

• cargo test --lib keyboard_traversal_
• cargo test --lib graph_canvas_accessibility_label_includes_focused_node_name

Observed result:

• All targeted #298 tests passed.

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• At least one keyboard traversal flow implemented and tested (Tab / Shift+Tab wrap traversal).
• Accessibility checklist status delta updated to reflect graph keyboard focus + naming baseline closure.
• Focus/naming behavior remains reducer-owned and deterministic.

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This closure establishes baseline keyboard traversal and naming exposure for the graph canvas interaction model. Follow-on accessibility work can extend from this baseline to richer per-node AccessKit subtree exposure and reader-mode traversal without changing the core deterministic traversal contract.