web/settings/defaults: toggle localProcessing depending on device

webkit is really weird with wasm ram management, so we disable local processing by default there. the user can still enable it manually in settings, but then we're not at fault by allowing potentially broken behavior by default

web/src/lib/device.ts

@@ -27,6 +27,7 @@ const device = {
         share: false,
         directDownload: false,
         haptics: false,
+        defaultLocalProcessing: false,
     },
     userAgent: "sveltekit server",
 }
@@ -81,6 +82,8 @@ if (browser) {
         // not sure if vibrations feel the same on android,
         // so they're enabled only on ios 18+ for now
         haptics: modernIOS,
+
+        defaultLocalProcessing: !iOS && !device.browser.webkit,
     };
 
     device.userAgent = navigator.userAgent;

web/src/lib/settings/defaults.ts

@@ -1,3 +1,4 @@
+import { device } from "$lib/device";
 import { defaultLocale } from "$lib/i18n/translations";
 import type { CobaltSettings } from "$lib/types/settings";
 
@@ -20,7 +21,7 @@ const defaultSettings: CobaltSettings = {
     },
     save: {
         alwaysProxy: false,
-        localProcessing: false,
+        localProcessing: device.supports.defaultLocalProcessing || false,
         audioBitrate: "128",
         audioFormat: "mp3",
         disableMetadata: false,