Add dragged field to pointer click and release

[Maksych]

Objective

• Scroll list with clickable items on mobile.

Solution

• Add dragged field to pointer click and release.

Testing

• Tested via example (examples/ui/mobile_list.rs)

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Showcase

An example of use is given in examples/ui/mobile_list.rs

[github-actions]

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[Copilot]

Pull Request Overview

Adds a dragged field to pointer click and release events to enable better mobile UI handling by distinguishing between clicks and scroll gestures. This allows scrollable lists with clickable items to work properly on mobile devices.

• Added dragged boolean field to Click and Release structs
• Updated event generation logic to track dragging state during pointer interactions
• Provided example demonstrating mobile scrollable list implementation

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
crates/bevy_picking/src/events.rs	Adds dragged field to Click and Release events and implements dragging detection
examples/ui/mobile_list.rs	New example demonstrating mobile scrollable list with clickable items
Cargo.toml	Registers the new mobile_list example

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[Maksych]

Resolves #18923

[github-actions]

The generated examples/README.md is out of sync with the example metadata in Cargo.toml or the example readme template. Please run cargo run -p build-templated-pages -- update examples to update it, and commit the file change.

[NthTensor]

I'm fine with this as it relates to the pointer event dispatch logic. Will leave it to others to say if this is how we prefer to resolve #18923.