feat: shake cursor to find by magnifying the cursor

[hojjatabdollahi]

This adds the feature to shake the cursor to locate it.
The algorithm is based on KDE's implementation. Collect the distance the cursor moved in the past 1 second, and divide by the diagonal of the bounding box, if it's more than a threshold, then the user is shaking their cursor.

recording-2026-07-20_16-22-08.mp4

• This is disabled by default, we need to add to add a toggle for this to accessibility page.

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[Drakulix]

Seems sane to me (and I personally adore the feature, is the maximum unlimited like in KDE?). Probably needs approval from @pop-os/ux though.

[hojjatabdollahi]

is the maximum unlimited like in KDE?

It is now!

recording-2026-07-21_10-31-23-trimmed.mp4

I also changed the default values to be closer to KDE's. For example hold the large cursor for 2 seconds before shrinking (it was 1 before).

[git-f0x]

Now we just need SVG cursors 🥹

[hojjatabdollahi]

Now we just need SVG cursors 🥹

#2659

[hojjatabdollahi]

Do we want to add any of the values as a config? For example sensitivity? Not necessarily in the GUI, but in the config files?

[Drakulix]

@hojjatabdollahi Maria agreed to add this feature, but we want a toggle in the Accessibility->Vision section to disable it (on by default).

I don't think we need any configuration beyond that. Could you make a cosmic-settings PR for this as well?

[Drakulix]

One minor thing, but looks good code-wise!

[hojjatabdollahi]

@Drakulix I'm afk till Sunday.

But I do have a draft for settings pop-os/cosmic-settings#2100

Feel free to update any of my PRs, or I will do it as soon as I'm back.

[Drakulix]

Thanks! Looks good from the code-side of things. :)

[leviport]

This is working great! I like the feature.

[RafaelKr]

Very helpful, I appreciate it, thank you very much!