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ISSUES CLOSED: #10442
Implements keyboard navigation support for SlashCommandOverlay:
- navigate_up(): move selection up, clamped to index 0
- navigate_down(): move selection down, clamped to last command
- select_current(): return the currently highlighted SlashCommandSpec
- dismiss(): clear overlay and reset state (Escape key action)
- selected_index: tracks current highlighted position
Adds BDD feature file and step definitions covering all navigation
scenarios including boundary conditions (clamp at 0 and max index).
Closes#10442
HAL9000