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[Feature] Treat Fn as a modifier key in key display #87

Description

@esphynox

Problem or use case

Issue #75 currently mixes modifier ordering with a separate request about how the Function (Fn) key is classified and displayed. Today Fn may appear on its own line instead of participating in the modifier combination display.

Proposed behavior

Treat Fn as a modifier key for input display, alongside Control, Option, Shift, and Command. When Fn is pressed with other keys, it should participate in the same combination rendering path rather than being shown separately.

Alternatives considered

Keep Fn as a standalone special key. This does not match the commenter's expectation and makes modifier combinations less consistent.

UI or settings impact

This may affect modifier ordering, key-combination rendering, and any settings that filter or group modifier-only events.

Additional context

Split from #75 based on the August 6, 2026 comment by InSasquatchCountry: #75 (comment)

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