v1.2.0

What's changed

• Improve first-run Plex setup by copying the Plex authorization URL to the clipboard.
• Automatically open the Plex authorization URL in the user's browser with autoraise enabled.
• Keep the authorization URL visible as a fallback if clipboard or browser launch support is unavailable.
• Add test coverage for the new setup URL handling.

Validation

• uv run pre-commit run --all-files
• uv run mypy src/plexbar tests
• uv run pytest