[Dexarim]

Summary

• add a configurable, per-profile Action Ring with eight slots, folders, presets, custom shortcuts, commands, and application launchers
• integrate the ring with mouse-button assignments, foreground-application profiles, cursor-relative placement, and adjustment actions
• add a dedicated editor, themed icons, optional LayerShellQt Wayland support, profile migration, and cancellation on device/profile changes
• keep existing gesture assignments separate from Action Ring

Behavior

• assigning Radial menu to a supported mouse button opens the ring around the cursor
• actions run only after an explicit item selection; the trigger, center control, or blank ring area dismisses it
• layouts are stored per device profile, including application-specific profiles
• folders support one nested level and up to nine child actions
• volume and brightness adjustment actions remain open while scrolling or dragging

Validation

• Debug build completed successfully with GCC 16.2.1 and Qt 6.11.2
• Action Ring and application-catalog native tests: 17 passed
• QML suite: 99 passed
• existing DeviceRegistry XDG-isolation test: passed after keeping the new application-initializing tests later in link order
• full local ctest: 782/786 passed; the four remaining failures are environment-sensitive existing tests in SettingsModelTest and HyprlandDesktopFocus, outside the files changed by this PR

Notes

• real mouse hardware behavior has not been re-tested on this clean PR branch
• LayerShellQt is optional; non-layer-shell compositors use the existing Qt window fallback
• third-party plugin loading is not part of this change