171 bug fixes

[lukazuljevic]

• 1. standings math counts unplayed and knockout matches as 0-0 draws - every scheduled match awards +1 point and +1 "played" to both teams
• 2 the public standings page (apps/app GroupsPage) fetches GET /group?tournamentId=, which returns raw teams with no stats - the table renders blank UT/GR/B columns and unsorted teams
• 3 every consumer of useCloseComponent registers its own window-level Escape listener, so one Escape press closes every stacked layer at once (e.g. nested delete-confirmation + TeamFormModal → unsaved batch player edits silently lost)
• 4 "Dodaj novu ekipu" from a group card on admin GroupsPage discards the group id - the team is created unassigned and is not put into a group
• 5 editing a match event and selecting "Nepoznat netko" sets playerId: undefined, which JSON serialization drops from the PATCH - the old player silently stays
• 6 Live timer: notify viewers when a match is activated or ended. Activating a match and "Kraj utakmice" reset the server-side timer, but the SSE stream only emitted on admin timer syncs, anyone watching the public site kept a ticking clock indefinitely after the match ended. The match service now pushes the reset state to all stream subscribers, so viewers' clocks stop immediately.
  Match events: make score update on delete atomic. Deleting a goal event wrote an absolute score computed from a read taken before the transaction, so an in-flight event create/update against the same match could be silently overwritten, leaving Match.homeGoals/awayGoals permanently out of sync with the events (the Math.max(0, …) clamp hid the drift). Delete now uses the same atomic increment/decrement pattern as event create and update, inside the same transaction.