Layout: JIS (Japanese) physical layout

[wsclx]

Status

Deferred — Japanese boards have additional physical keys (Henkan, Muhenkan, Kana) and a different row count than the existing ISO/ANSI variants. Slot allocation can't be hand-derived without hardware verification.

What's needed

• AK820 Pro JIS hardware unit (or photo of the firmware export from one).
• Slot allocation map: which HID slot drives Henkan / Muhenkan / Kana / 半/全 / カタカナ.
• Layout JSON additions in src/data/layouts/ matching the schema of the existing ISO-DE / ANSI / ISO-UK / ISO-ES / ISO-FR files.

References

• Layout system: src/data/layouts/use-layout.ts
• Sidebar picker: src/App.tsx
• Existing layouts: src/data/layouts/

Acceptance

• JIS-DE layout file ships with sidebar entry.
• Keymap view renders all 6 JIS-only keys at correct physical positions.
• Hardware-verified by someone with the actual hardware (mark as 🧪 unverified until then, like ANSI/UK/ES/FR currently are).