Replace console-based army split with keyboard-driven split mode (1-9)

[Copilot]

• Explore repository structure and understand split army flow
• Add split mode state variables (splitModeActive, splitModeArmyId, splitModeTotalSoldiers)
• Modify S key handler to enter split mode instead of reading from console
• Add 1-9 key handling in split mode to select split amount
• Remove number key move commands (1-4) per reviewer feedback
• Add UI overlay for split mode (similar to policy menu)
• Remove console scanner usage for split
• Add frontend test for split command with amounts 1-9
• Build and verify (16 frontend tests pass)

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[dmccoystephenson]

@copilot The 'move' commands tied to number keys should be removed.

[Copilot]

@copilot The 'move' commands tied to number keys should be removed.

Removed all four number-key move commands (keys 1-4) in 5147d8e. Number keys are now only used for split amount selection when split mode is active.