Volatility: visual update

In this version, I focused on polishing the visual atmosphere of the game.

I implemented a brand new CRT screen filter and noise effects, trying to create psychological pressure for the player—after all, it really sucks when stocks drop.

In previous versions, the top goal bar used the goal completion percentage (%). I noticed this didn't mean much for the player's progress, since the proportion can be seen on the bar anyway. Showing the actual net asset value is more useful.

Other changes:

• Fixed description errors
• Updated the cover imag
• The text and images are made with AI plus manual modifications, so I have added the AI generation disclosure.