Amendment urls

[tillprochaska]

Merge #1472 first.

[Copilot]

Pull request overview

This PR adds support for storing, exporting, serving, and displaying an “amendment PDF URL” for amendment-related votes (sourced from the EP ODP plenary-documents endpoint), including a new UI affordance to let users open the amendment text.

Changes:

• Backend: add amendment_url to the vote model + migration, export output, and related-votes API serialization.
• Scraper: extend ODPDocumentScraper to derive an amendment PDF URL from ODP “amendment list” ranges.
• Frontend: add an action slot to Card and render an external-link action in AmendmentVoteCard (including a new SVG symbol).

Reviewed changes

Copilot reviewed 12 out of 15 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
frontend/src/images/icons.svg	Adds an external-link SVG symbol used by the UI action link.
frontend/src/components/Card.tsx	Adds an action slot to cards (note: currently missing className passthrough).
frontend/src/components/Card.css	Switches card layout to CSS grid and introduces .card__action area.
frontend/src/components/AmendmentVoteCard.tsx	Displays a “View text” external link when amendment_url is present.
frontend/src/api/generated/types.gen.ts	Extends RelatedVote with amendment_url.
backend/howtheyvote/scrapers/votes.py	Derives amendment_url in ODPDocumentScraper and includes it in fragments.
backend/howtheyvote/models/vote.py	Adds amendment_url column mapping to the Vote model.
backend/howtheyvote/export/init.py	Includes amendment_url in the votes export row + CSV output.
backend/howtheyvote/api/votes_api.py	Includes amendment_url in the related-votes API payload.
backend/howtheyvote/api/serializers.py	Adds amendment_url to RelatedVoteDict schema typing.
backend/howtheyvote/alembic/versions/81451d6f5456_add_amendment_url_column_to_votes_table.py	Migration to add/drop the amendment_url column.
backend/tests/scrapers/test_votes.py	Updates scraper tests and adds coverage for amendment URL derivation.
backend/tests/export/test_init.py	Updates export tests for the new CSV column.
backend/tests/api/test_votes_api.py	Updates API tests to expect amendment_url.

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