[BI & MI Data Mappers] Fix positioning mapping options widget for root input,output mappings

[madushajg]

Addresses: wso2/product-ballerina-integrator#1329

[Copilot]

Pull Request Overview

This PR fixes positioning issues for mapping options widgets in data mapper diagrams by implementing boundary constraints to keep labels fully visible within the canvas area.

• Adds canvas boundary detection to prevent labels from being positioned outside the visible area
• Implements constraint logic to adjust label positions when they would exceed canvas boundaries
• Applies the same fix to both Ballerina and MI data mapper components

Reviewed Changes

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

File	Description
workspaces/mi/mi-data-mapper/src/components/Diagram/OverriddenLinkLayer/LabelWidget.tsx	Adds boundary constraint logic to keep mapping option labels within canvas bounds
workspaces/ballerina/data-mapper/src/components/Diagram/OverriddenLinkLayer/LabelWidget.tsx	Identical boundary constraint implementation for Ballerina data mapper

Comments suppressed due to low confidence (2)

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