feat(core): add the Calculator hotkey as a divertable keyboard key

[4ni1ak]

Summary

Rebase/adoption of #1247 (thorstent) onto current master — original PR went stale (CONFLICTING). Author preserved via git commit.

Adds ButtonId::KeyCalculator and (0x000a, ButtonId::KeyCalculator) to KEYBOARD_KEY_CIDS, making the Calculator hotkey bindable like the existing nine keyboard keys.

With the keyboard in macOS mode, the firmware emits no HID usage at all for this key (verified at the HID/evdev/libinput level on a real ERGO K860 — see #1247 for the full verification writeup), so diversion is the only way to reach it. In Windows mode it natively sends consumer usage AL Calculator (0x0192); binding it suppresses that native usage the same way the other divertable keys behave.

As for every entry in the table, an unbound key is never diverted — stock firmware behavior is unchanged unless the user explicitly binds it.

Changes

• openlogi-core: append ButtonId::KeyCalculator (append-only per button.rs's own convention), grow KEYBOARD_KEYS to 10, add the display name + locale key across all 23 catalogs, default to Action::None.
• openlogi-device: add (0x000a, ButtonId::KeyCalculator) to KEYBOARD_KEY_CIDS.

Testing

• cargo fmt --all -- --check
• RUSTFLAGS="-D warnings" cargo clippy --workspace --all-targets -- -D warnings
• cargo test --workspace
• Not independently hardware-verified here — see feat(core): add the Calculator hotkey as a divertable keyboard key #1247 for the original author's on-device verification (ERGO K860 for Business, macOS + Linux + Windows mode comparison).

Fixes #1147
Closes #1247

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge because unsupported or unbound Calculator controls remain native and diverted controls use the existing generic restoration lifecycle.

Summary

This PR adds the Calculator hotkey as an append-only bindable keyboard control while preserving native behavior for unbound or unsupported keys.

• Adds ButtonId::KeyCalculator, its inert default, display label, and translation key.
• Maps HID++ CID 0x000a to the new button identifier.
• Advances the IPC protocol version to account for the shared enum change.
• Adds the Calculator label to every shipped locale catalog.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart LR
    B[User assigns Calculator binding] --> W[Watcher requests CID 0x000a]
    W --> C{Device advertises it as divertable?}
    C -->|No| N[Leave native behavior unchanged]
    C -->|Yes| D[Divert firmware control]
    D --> E[Emit KeyCalculator action events]
    E --> S[Binding removed, channel replaced, or watcher stops]
    S --> R[Restore original firmware reporting]

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_{Reviews (1) · Last reviewed commit: "feat(core): add the Calculator hotkey as..."}

[thorstent]

Thanks for the rebase. Will be great to have the button working on Mac

[4ni1ak]

Thanks for the original work and for confirming — hope it lands soon.