[codex] fix linux hook device selection

[Tinnci]

Fixes #355.

What changed

• Start the OS mouse hook only after inventory reports an online routed mouse or trackball with pointer/button capability.
• Stop the hook again when no hookable device remains or accessibility is revoked.
• Filter Linux evdev hook candidates to Logitech input devices and continue excluding OpenLogi virtual devices.

Why

On Linux the hook backend previously enumerated every evdev device with BTN_LEFT before HID++ inventory had established a target device. On laptops this can include the built-in touchpad or TrackPoint, so OpenLogi could grab those devices and create virtual mice even when there was no Logitech pointing device to manage.

Validation

• cargo fmt --all -- --check
• CARGO_TARGET_DIR=/home/drie/.cache/openlogi-target cargo clippy --workspace --all-targets -- -D warnings
• CARGO_TARGET_DIR=/home/drie/.cache/openlogi-target cargo test --workspace
• git diff --check