Randomize game seed on every new game start

[Copilot]

MainStreetScene was passing a hardcoded seed: 'main-street-demo' to setupMainStreetGame(), causing every game — including "play again" restarts via scene.restart() — to produce identical card sequences.

Change

• MainStreetScene.ts: Removed the hardcoded seed so setupMainStreetGame() falls through to generateSeedString(), which produces a fresh random 6-character alphanumeric seed on each call.

// Before
this.state = setupMainStreetGame({
  seed: 'main-street-demo',
  difficulty: this.selectedDifficulty,
});

// After
this.state = setupMainStreetGame({
  difficulty: this.selectedDifficulty,
});

Original prompt

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This section details on the original issue you should resolve

<issue_title>Randomize game seed</issue_title>
<issue_description>

It feels like the game seed is fixed, that is if I play a game then opt to lay a new game the cards come out the same. We need to ensure the game is randomized at start.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Randomize game seed #419

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