- Fix A wrong UI hint during tutorial mission
- Fix contract hand-in bug
- Some other UI fixes

- Contracts gain a priority field so random encounters (armageddon,
rescue) take over the quest panel and mission nav target while
they're active, restoring the underlying contract's nav target on
completion. Martinez's dialogue now routes skip-tutorial players
past the tutorial despin into repeatable wrangling, and contextual
hints short-circuit entirely once tutorial_skipped is set.