What are all the moments where priority changes?

In Riftbound, priority is the exclusive right to take discretionary actions. According to Rule 312.2, a player receives priority at the following specific moments:

1. Neutral Open State: When the turn is in a Neutral Open State during the player's Action Phase (Rule 312.2.a).
2. Gaining Focus: When the turn is in a Showdown State and the player gains focus (Rule 312.2.b).
3. Controlling the Chain: When the turn is in a Closed State and the player controls the next item on the chain (Rule 312.2.c).
4. Passing Priority: When the turn is in a Closed State, the player is the next in turn order, and the current player with priority passes (Rule 312.2.d).

Additionally, specific game steps dictate priority transitions:

• Passing: If a player passes priority without adding an item to the chain, the active player passes priority to the next player in turn order (Rule 335.2).
• Showdown Resolution: When the last item on a chain resolves during a showdown (excluding the initial chain), focus passes, and the next player gains both focus and priority (Rule 343).

When a player is granted priority, it is either created if no player had it, or it is removed from the player who previously held it (Rule 312.3).

Note: I could not fully verify the ruling regarding Rule 333.1.c.3 against the retrieved rules.