Support multiple keyboard layouts

[mohabbis]

Add support for non-US keyboard layouts in USB HID output, so commands typed for one layout render correctly on host computers configured with a different layout.

Sub-project: C app (/src/usb_hid.c)
Source: docs/ROADMAP.md, Phase 3 — USB Enhancements

[mohabbis]

Triage

• Priority: Medium
• Duplicate check: None found.

Phase 3 item — broadens usability for non-US keyboard users; real impact depends on current user base composition.

Automated triage based on docs/ROADMAP.md phase and current implementation status.

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Generated by Claude Code

[mohabbis]

Triage

• Priority: Medium
• Duplicate check: None found.

Phase 3 item — broadens usability for non-US keyboard users; real impact depends on current user base composition.

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Generated by Claude Code