Make Mouse scanning repeat stopping configurable

[enaboapps]

Repeating Mouse scanning currently always stops on switch release. Add Stop repeating beside the repeat controls on the Mouse sidebar page, with On switch press and On switch release. Release remains the default for new and older settings.

The choice applies to scanned movement and scrolling with local and Remote-forwarded switches. Both choices consume the stop gesture and overlapping edges, suppress assigned hold actions, and preserve emergency stopping. Panel prompts and scanning help follow the selected edge. Saving uses the existing scanning configuration and retry flow; direct Remote pointer commands and schema versions are unchanged.

Closes #964.

Validation

• Node 24.19.0: prediction model, lint, test (251 Vitest and 9 script tests), and production build passed.
• Rust 1.97.1: formatting, clippy with warnings denied, and tests passed (621 unit tests, 1 ignored, 7 integration tests).
• Fake input coverage includes both edges for movement and scroll, local and forwarded switch capture, overlap/unmatched edges, configured gesture suppression, repeat disabled, cleanup, persistence/defaults, selected prompts, and UI save failure/retry.
• Windows 11 Parallels VM: the guest still shows the same 8:31 AM desktop and ignores Windows+R; native build and switch interaction could not be exercised. The branch was not installed in the guest.
• Independent review of head 5a0cf1ee9fc9d2a477a417f7ac14b30b1a3945cb found no actionable findings after checking both transports, overlapping edges, emergency handling, settings reset, compatibility, prompts, and retry behavior.
• Required GitHub CI passed on the reviewed head, including macOS app/dmg and Windows NSIS/UI Access builds, frontend, dependency audit, and CodeQL.