fix: vr unpaused menus (skills, map, input and melee block)

[cmpayc]

Summary

Online, several VR menus are unpaused so the game keeps running for everyone else. That broke the Skills and Map menus and let gameplay input and melee through in every unpaused menu. This PR fixes those problems without pausing the game. All changes are behind TP_SKYRIMVR, and the SE build is unchanged.

Highlights

• Skills tree visible online: the tree model is a distance-faded node that faded to nothing when unpaused. It's now kept fully faded in.
• No more blinking in Skills: the menu moved the 3D tree from a worker thread while the main thread drew it. That update now runs on the main thread at the start of the next frame.
• Map no longer pauses the game: fixes the missing interior overlay, the world map drawn in the cell's fog, the laser pointer stuck in place, and the fog blinking.
• Input blocked in unpaused menus: walking, jumping and crouching no longer reach the player while an unpaused menu is open.
• No melee in unpaused menus: the game's own swing detector now also cancels swings while any unpaused menu is open.