Refactor alias handling: simplify detection logic and reduce allocations#23

Copilot wants to merge 2 commits intoclaude/plan-key-alias-support-01Q8Q1qANjKGsL4x1iy4JpfJjackielii/skhd.zig:claude/plan-key-alias-support-01Q8Q1qANjKGsL4x1iy4JpfJfrom

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