refactor: remove uses of execCommand()

[ElectricalBoy]

Summary

This PR removes existing uses of Document.execCommand() (deprecated)

How did you test this change?

browser dev tools

[hjpalpha]

seems reasonable on phone

[Copilot]

Pull request overview

This PR modernizes “select all / copy to clipboard” behaviors by removing deprecated Document.execCommand() usage and switching to Selection + navigator.clipboard APIs in the commons JS utilities.

Changes:

• Refactors Selectall to select text via DOM Ranges and copy via navigator.clipboard.writeText, along with updated wrapper/button styling.
• Updates CopyToClipboard to use navigator.clipboard.writeText and error-notify when unsupported.
• Adds types-mediawiki to devDependencies.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 6 comments.

File	Description
stylesheets/commons/Selectall.scss	Updates layout styles to match the new wrapper/button structure (removes textarea-overlay approach).
javascript/commons/Selectall.js	Replaces textarea + execCommand('copy') flow with Range selection and Clipboard API copy.
javascript/commons/CopyToClipboard.js	Removes execCommand fallback and relies on Clipboard API with user notification on lack of support.
package.json	Adds types-mediawiki dev dependency.

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[Copilot]

Pull request overview

This PR refactors the existing “select all / copy to clipboard” UI behaviors to remove deprecated Document.execCommand() usage and rely on modern Clipboard APIs in the Liquipedia client-side modules.

Changes:

• Refactored Selectall to select text via Range/Selection and copy via navigator.clipboard.writeText.
• Refactored CopyToClipboard to use async Clipboard API with user notifications on unsupported/failure paths (and removed the old execCommand-based fallback).
• Simplified the Selectall SCSS to match the new DOM structure and added types-mediawiki as a devDependency.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
stylesheets/commons/Selectall.scss	Removes styles for the old textarea-overlay approach; keeps layout styles for the new wrapper/buttons.
javascript/commons/Selectall.js	Replaces execCommand('copy') flow with Selection + Clipboard API and simplifies wrapper creation.
javascript/commons/CopyToClipboard.js	Replaces execCommand('copy') fallback with async Clipboard API + error notifications.
package.json	Adds types-mediawiki devDependency (intended for editor/type support).

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