Modern UI mVUS

Modern UI 3.12.0.5-build.4 — Version bump (2026-01-29)

• Performance: use async PBO readback for UI screenshots; cap GLFontAtlas growth and evict chunks; index glyphs by chunk for atlas eviction.
• UX/input: discard stale back-press requests; ignore ModernUI center hotkey while chatting.
• Stability/logging: replace printStackTrace with Log4j logging; remove Kiwi fatal log spam; fix mixin disable checks with multiple flags.
• Compatibility: improve ImmediatelyFast framebuffer compat; align loader metadata for known mod conflicts; add ModListCompat pilot and compat-layer doc.
• Misc: use getStyleModifier when available for rarity; remove unfinished music visualizer stubs; gate forced GC to developer mode; add missing ru_ru and uk_ua translation keys.
• Build/docs: gate mavenLocal behind -PuseMavenLocal; drop Minecraft 1.21.8 build target; add GitHub Actions CI build matrix; changelog maintenance (merge per-version entries and normalize headings).