GeometryEditorToolbar - Add snap settings button

[CalebRas]

Description

This PR adds a button that presents a sheet for configuring snap settings to the GeometryEditorToolbar.

Closes swift/issues/8165.

Behavior

• The toolbar button is hidden when snapSettings.sourceSettings is empty.
• The "Snap to Geometry Guides", and "Snap to Features" toggles are hidden when "Enable Snapping" is off.

Snap Source Toggles

• Are disabled if their parent toggle is off.
• Are disabled if their ruleBehavior is rulesPreventSnapping.
• Display a subtitle for non-nil ruleBehavior.

How To Test

• Open the "Geometry Editor Toolbar Snapping" example in the Caleb/TestSnapSettings branch.
• Tap a feature on the map to start the geometry editor.
• Tap the gear button in the toolbar to open the settings sheet
• Use the controls to configure snap settings.

Note: The data in the test example doesn't have any snap rules, so the view will look different than the screenshots.

Screenshots

Before	After

Platforms

iPhone
iPad
Mac Catalyst
Mac Catalyst

[Copilot]

Pull request overview

This PR adds a snapping settings entry point to GeometryEditorToolbar by introducing a new toolbar button that presents a sheet (SnapSettingsView) for configuring SnapSettings (enable/disable snapping, haptics, geometry guides, feature snapping, and per-source toggles).

Changes:

• Added SnapSettingsView (form-based UI) for configuring SnapSettings and SnapSourceSettings.
• Added a new toolbar control (SnapSettingsButton) that conditionally appears and presents the snap settings sheet.
• Minor layout tweak to use the existing stackSpacing constant for the horizontal stack.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
Sources/ArcGISToolkit/Components/GeometryEditorToolbar/SnapSettingsView.swift	New settings UI for snapping, including per-source toggles and rule-behavior messaging.
Sources/ArcGISToolkit/Components/GeometryEditorToolbar/GeometryEditorToolbar.swift	Adds the settings button + sheet presentation and updates docs/layout accordingly.

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[rolson]

The overall enable snapping button isn't needed:

[yo1995]

I'll make some changes based on today's feedback

[rolson]

I'll make some changes based on today's feedback

Can you be specific with what other changes? I don't think anything needs to be done with persistence yet. I think that will be at the feature editor or app level.

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.