wasm: enable AudioWorklets with JSPI to fix no-sound on web

make.lua

@@ -109,6 +109,7 @@ lm:conf {
 		defines = {
 			"_POSIX_C_SOURCE=200809L",
 			"_GNU_SOURCE",
+			"MA_ENABLE_AUDIO_WORKLETS",
 		},
 	},
 	defines = {
@@ -134,9 +135,10 @@ lm:exe "soluna" {
 	deps = deps,
 	emcc = {
 		ldflags = {
-			"-s MAIN_MODULE=1",
-			"-Wl,-u,emscripten_builtin_memalign",
-			"-Wl,--export=emscripten_builtin_memalign",
+			"-sJSPI",
+			"-sAUDIO_WORKLET=1",
+			"-sWASM_WORKERS=1",
+			"--js-library=src/platform/wasm/soluna_audio_wasm.js",
 		},
 	},
 }

src/platform/wasm/soluna_audio_wasm.js

@@ -0,0 +1,37 @@
+// Override emscripten_request_animation_frame_loop to support JSPI.
+//
+// When JSPI is enabled (-sJSPI), audio worklet initialization calls
+// emscripten_sleep() which requires the WebAssembly call stack to be
+// in a "promising" context (wrapped with WebAssembly.promising).
+//
+// This override wraps the C frame callback with WebAssembly.promising
+// so that emscripten_sleep works correctly during audio init.
+mergeInto(LibraryManager.library, {
+  emscripten_request_animation_frame_loop__deps: ['$getWasmTableEntry'],
+  emscripten_request_animation_frame_loop__sig: 'vpp',
+  emscripten_request_animation_frame_loop: function(cb, userData) {
+    var fn = getWasmTableEntry(cb);
+    var promisingFn = null;
+    if (typeof WebAssembly !== 'undefined' && typeof WebAssembly.promising === 'function') {
+      try {
+        promisingFn = WebAssembly.promising(fn);
+      } catch (e) {
+        promisingFn = null;
+      }
+    }
+    function tick(rAF_time) {
+      if (promisingFn) {
+        promisingFn(rAF_time, userData).then(function(keepGoing) {
+          if (keepGoing) requestAnimationFrame(tick);
+        }).catch(function(e) {
+          console.error('Soluna: JSPI frame callback error (WebAssembly.promising):', e instanceof Error ? e.message : String(e), e);
+        });
+      } else {
+        if (fn(rAF_time, userData)) {
+          requestAnimationFrame(tick);
+        }
+      }
+    }
+    requestAnimationFrame(tick);
+  },
+});