feat: migrate gtk.wasm to unified Meson-based build system with web-native optimizations#2

superstructor wants to merge 1 commit intowasmdiscere-os/gtk.wasm:wasmfrom

claude/migrate-meson-wasm-01SEnd6wvjyzZdSHBUTw3RaSdiscere-os/gtk.wasm:claude/migrate-meson-wasm-01SEnd6wvjyzZdSHBUTw3RaSCopy head branch name to clipboard