Chapter 1-2 fixes and updates #2

The biggest things in this update are fixes to a few game-crashing errors, and I did some small content revisions as well:

• Fixed an error in the stat page introduced in the earlier 3/4/25 update
• Fixed demo end page errors
• Fixed a chapter-skip error
• Minor tweaks to stat page
• Clarified Chapter 1 height choices
• Made a cute little clarification re Vastan purring (thank you for that note, anonymous player! I had entirely forgotten, despite having whole binders of big cat facts when I was a child!)