[Purdze]

Type of change

• Bug fix
• New feature
• Breaking change
• Refactor / code cleanup
• Performance improvement
• Chore / tooling
• Documentation

Summary

ports the menu background blur.

blur:

• post_effect/blur.json's chain: three rounds of horizontal then vertical box_blur, bilinear, full resolution, run in the post effects alongside the spectator effects
• replaces the old half-resolution gaussian (blur.rs, blur.frag) and the per-screen blur value
• a BlurBackground marker is blurBeforeThisStratum: elements before it are blurred in place, the rest draw sharp. in game this blurs the world and the hud, like GuiRenderer.draw
• pomme's branded frosted panels keep BlurBackdrop and sample the same blur without touching the frame

where it runs:

• screens that blur in Screen.extractBackground push the marker: options, credits, account, server and world lists, connecting/status screens, the pause menu while shown (PauseScreen.extractBackground), and dialogs
• the title screen, death screen, chat and containers don't

option:

• menu background blur is a real 0-10 slider in video settings and accessibility, default 5, labelled genericValueOrOffLabel style ("OFF" at 0), saved in options.json; 0 skips the blur like extractBlurredBackground

not here:

• back from options to the pause menu, the pause menu ignores input (already on master)
• chat draws above blurred screens since it's built after them
• the menu backdrop always uses inworld_menu_background; the no-level menu_background is a separate parity fix

Reference

post_effect/blur.json, box_blur.fsh, Screen, PauseScreen, GuiRenderer, Options (menuBackgroundBlurriness)

Testing

• just client-pre-pr checks (fmt, clippy with and without the harness, client tests)
• just ingame-test full native suite passes; new ui/menu_blur screenshots the pause menu at 5, 0 and 10 and in-game options
• needs an eye check: title screen to options (panorama blur) and the branded main screen's frosted panels