Implement code export modal for collections

[furelid]

Description

This pull request adds an export feature to the collection admin form, enabling users to export the configuration of config-managed collections as JSON via a modal dialog. The main changes involve UI enhancements and the addition of client-side logic to fetch and display collection data for export.

Changes

• Added an "Export" button to the collection form header, allowing users to initiate the export process for a collection.
• Implemented a modal dialog (code-export-modal) that displays the exported collection configuration as JSON, includes a copy-to-clipboard button, and provides user feedback when copying.
• Added JavaScript to handle opening/closing the export modal, fetching collection data from the API, populating the modal's textarea with formatted JSON, and managing copy feedback and modal state.
• Included keyboard and backdrop click handlers for improved modal accessibility and usability.…with modal

Testing

Manually tested, small batch of frontend code only - shouldn't be a need but can take it on when I have more free time
I included a short video testing different dimensions, using linux with chromium

Unit Tests

• Added/updated unit tests
• All unit tests passing

E2E Tests

• Added/updated E2E tests
• All E2E tests passing

Screenshots/Videos

589252068-b6869dd1-f15a-4134-b5f5-3c97a2b96e20.webm

Checklist

• Code follows project conventions
• Tests added/updated and passing
• Type checking passes
• No console errors or warnings
• Documentation updated (if needed)

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[lane711]

nice! checking this out now

[lane711]

Thanks @furelid! Closing in favor of #831, which mirrors your commit (preserving authorship) onto an internal branch so CI could run without the fork-authorization gate, plus a small follow-up commit addressing some review items:

• Render export button + modal only on edit (need a name to fetch)
• currentColor on the export icon (was invisible on the light-mode button)
• JSON.stringify the embedded collection name to avoid breaking the script on a '
• Escape display_name in modal HTML
• Prefer navigator.clipboard.writeText with execCommand fallback
• Drop id from the snake→camel result so it actually satisfies CollectionConfig
• encodeURIComponent the collection name in the fetch URL
• Wrap the script in an IIFE to avoid leaking helpers onto window

Appreciate the contribution!

[lane711]

Superseded by #831 (mirrored + follow-up fixes).