feat: improve loose game state

new features:

• links are disabled and grayed out if the game is lost
• game is now lost if player enters a passage with no links
• adde Playthrough and PlaythroughState classes that manages a Playthrough.

todo:

• add unit tests for Playthrough and PlaythroughState

added 1 commit

• f45bed88 - feat: Playthrough and PlaythroughState classes

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approved this merge request

mentioned in commit 84e267d0

merged