Add click action mode with down-only backend support

[realChriss]

Summary

Added a new Click Action feature that lets users choose between:

• Down + Up (normal click behavior)
• Down Only (send mouse-down events only)

The setting is exposed in the Advanced > Cadence panel, persisted in frontend settings/presets, and wired into the
Rust backend click engine.
Backend behavior now uses send_release to control whether per-click release events are sent, and always sends a final
safety release when stopping in down-only mode.

Related issue

N/A

Testing

Tested locally with:

• npx tsc --noEmit -p tsconfig.app.json
• npx tsc --noEmit -p tsconfig.node.json
• cargo test in src-tauri
• npm run frontend:build

Checklist

• I tested the change locally
• I kept the change focused and relevant
• I updated any related documentation if needed

[realChriss]

@Blur009 you might wanna look at this

[Blur009]

Yes thank you, I've done basically 0 coding since the 3.5 released. I entirely overworked myself on that one xD. But once I have the next video out, ill look into github / autoclicker more again. (i havent looked closely at it, but thank you for the pr)

[Blur009]

since a higher click speed is already only causing more issues, i dont think this will be needed