Fix dealer win game ending logic in all last scenarios

[Copilot]

This PR fixes a critical issue where the game doesn't end properly when the dealer (oya) is in 1st place during all last and wins.

Problem

When the dealer wins during all last while in 1st place, the game sometimes doesn't end as expected due to a logic error in the checkGameOver function.

Root Cause

In the checkGameOver function, line 793 accessed gameStore.getPlayer(winState.winner) without checking if winState.winner was empty or undefined. When winState.winner is empty (which can happen after draws or in certain game states), this causes the dealer detection logic to fail, preventing proper game ending detection.

Fix

Added proper validation before accessing winState.winner:

// Before
if (gameStore.getPlayer(winState.winner).seat === kazeList[0]) {
    oyaPlayer = gameStore.getPlayer(winState.winner)
}

// After
if (winState.winner && winState.winner !== '' && gameStore.getPlayer(winState.winner).seat === kazeList[0]) {
    oyaPlayer = gameStore.getPlayer(winState.winner)
}

Testing

• ✅ Project builds successfully with no TypeScript compilation errors
• ✅ Application loads and runs correctly in development mode
• ✅ UI functionality verified through manual testing

This minimal change addresses the core logic issue while preserving all existing functionality, ensuring correct game ending detection when the dealer wins in all last scenarios.

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[dev-soragoto]

// Before
pointChangeList[gameStore.seatList.indexOf(winPlayerName)] -= 1000

// After
var winPlayerSeatIndex = gameStore.seatList.indexOf(winPlayerName)
pointChangeList[winPlayerSeatIndex] -= 1000

这个更改有什么意义吗

[dev-soragoto]

起码看着不会炸 合一下看看

[Copilot]

// Before
pointChangeList[gameStore.seatList.indexOf(winPlayerName)] -= 1000

...

你说得对，这个更改在功能上是等价的，并没有实际意义。原来的 pointChangeList[gameStore.seatList.indexOf(winPlayerName)] -= 1000 和新的代码效果完全一样。如果你更倾向于保持原来的写法，我可以把这个改动撤销掉。