Add 'Copy Document' option to document menu

[vkarpov15]

Motivation

• Provide a quick way for users to copy the full document JSON from the document-details overflow (3-dot) menu on both desktop and mobile to simplify exporting or sharing a document.

Description

• Add a "Copy Document" button to the desktop and mobile overflow menus in frontend/src/document/document.html.
• Implement copyDocument() in frontend/src/document/document.js which serializes this.document to pretty JSON and writes it to the clipboard using navigator.clipboard.writeText with a textarea fallback, and displays a success toast on completion.

Testing

• No automated tests were executed for this change.

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Codex Task

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Project	Deployment	Actions	Updated (UTC)
studio	Ready	Preview, Comment	Jan 31, 2026 10:36pm

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[Copilot]

Pull request overview

This PR adds a "Copy Document" feature to the document detail page, allowing users to quickly copy the full document JSON to their clipboard from the overflow menu. The implementation provides both a modern Clipboard API with a textarea fallback for broader browser support.

Changes:

• Added copyDocument() method that serializes the document to JSON and copies it to clipboard using navigator.clipboard API with execCommand fallback
• Added "Copy Document" button to both desktop and mobile overflow menus in the document header

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
frontend/src/document/document.js	Implements the copyDocument() method with clipboard API and textarea fallback, displaying success toast on completion
frontend/src/document/document.html	Adds "Copy Document" button to both desktop (line 87-93) and mobile (line 167-173) overflow menus

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