feat(core): add PageUp and PageDown actions across all backends

[FeliciaFiction]

Add bindable Page Up and Page Down actions (USB HID usages 0x4b and 0x4e). These share one physical key usage across all platforms, so they use a single Shortcut enum variant and KeyCombo mapping in each inject backend (Linux, macOS, Windows).

• Action::PageUp / Action::PageDown in openlogi-core
• Shortcut::PageUp / Shortcut::PageDown with completeness test coverage
• Icon mapping in action picker (chevrons-up / chevrons-down)
• IPC protocol version bump to 30
• Locale entries in all 23 translation files

Related to #1190

[greptile-apps]

Greptile Summary

Adds bindable Page Up and Page Down actions throughout the core action model, action picker, platform injection backends, IPC versioning, and localized resources.

• Maps the actions to USB HID usages 0x4b and 0x4e on Linux, macOS, and Windows.
• Adds picker icons and translations across all supported locales.
• Increments the IPC protocol version to 30.

Confidence Score: 5/5

The PR appears safe to merge within the scope of eligible follow-up findings.

No blocking eligible failure remains.

Important Files Changed

Filename	Overview
crates/openlogi-core/src/binding/action.rs	Appends PageUp and PageDown actions and adds them to the generated action catalog.
crates/openlogi-core/src/binding/effect.rs	Classifies the new actions as shared shortcuts.
crates/openlogi-inject/src/inject/linux.rs	Maps Page Up and Page Down to their existing Linux key-code conversions.
crates/openlogi-inject/src/inject/macos.rs	Maps Page Up and Page Down to their existing macOS virtual-key conversions.
crates/openlogi-inject/src/inject/windows.rs	Maps Page Up and Page Down to their existing Windows virtual-key conversions.
crates/openlogi-ipc/src/ipc.rs	Increments the strict IPC protocol version to 30.
crates/openlogi-ipc/tests/wire_format.rs	Updates the pinned protocol-version assertion.

_{Reviews (3): Last reviewed commit: "Merge branch 'AprilNEA:master' into feat..." | Re-trigger Greptile}