Add markdown export

[ellgreen]

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[Copilot]

Pull request overview

This PR adds markdown export functionality to retrospectives, allowing users to view a formatted markdown representation of their retro data during the "discuss" phase. The feature includes a new UI dialog component that displays the markdown in a read-only textarea, backend API endpoint to generate the markdown, and an exporter service that formats retro notes and columns into markdown structure.

Key Changes

• New markdown export endpoint (/api/retros/{id}/markdown) that generates formatted markdown from retro data
• UI component with dialog showing markdown content in a read-only textarea
• Integration into the board UI, visible only during the "discuss" status
• Routine dependency updates for both Go and npm packages

Reviewed changes

Copilot reviewed 8 out of 10 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
ui/src/components/ui/textarea.tsx	New reusable textarea component with styling for forms and inputs
ui/src/components/retro/download.tsx	Dialog component that fetches and displays markdown export of retrospective
ui/src/components/retro/board.tsx	Integrates Download button into board navigation during discuss phase
ui/package.json	Updates React, Radix UI, and other frontend dependencies to latest versions
go.mod	Updates Go to 1.24.0 and various dependencies including validator, goose, and sqlite
go.sum	Checksum updates corresponding to go.mod dependency changes
cmd/thoughts/routes.go	Registers new markdown export route for retros
cmd/thoughts/exporters/markdown.go	New exporter service that formats retro data into markdown structure
cmd/thoughts/controllers/retros.go	New handler for markdown export endpoint with unused helper function

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