Improve saved article lists and add AIO dev workflow

[andreasmolnardev]

Summary

• add a GitHub Actions workflow that builds and publishes the aio-dev Docker image on pushes to dev
• add a newsSavedArticleLists PocketBase collection and migrate saved articles to list relations
• update saved article responses/types/sidebar routes to use saved list records
• update read-later save affordance hover color and saved checkbox icon state

Testing

• bun run typecheck
• bun run lint (blocked in clean worktree: eslint command not found without dependencies)
• bunx tsc --noEmit (blocked in clean worktree: missing bun/node type definitions without dependencies)

Closes #232

[andreasmolnardev]

Todo: local test