Add turtle voice lines and ambient water SFX

Wire turtvox voice clips to their matching speech bubbles (predator alert,
shell bite, plastic ingestion, propeller strike, tickle reward, idle musing)
and loop water SFX as ambient underwater sound throughout the ocean scene.
Precache media in the service worker (v11 -> v12) for offline playback.
Also fix raw control bytes in the name-sanitization regex.

sw.js

@@ -1,4 +1,4 @@
-const CACHE_NAME = 'tortugotchi-v11';
+const CACHE_NAME = 'tortugotchi-v12';
 const ASSETS = [
   './',
   './index.html',
@@ -6,7 +6,16 @@ const ASSETS = [
   './app.js',
   './manifest.json',
   './icon-192.png',
-  './icon-512.png'
+  './icon-512.png',
+  './media/turtvox001_another_day_in_the_deep_blue.m4a',
+  './media/turtvox002_best_human_ever.m4a',
+  './media/turtvox003_bitten_shell_but_ok.m4a',
+  './media/turtvox004_somebodys_coming.m4a',
+  './media/turtvox005_ate_a_bag_toxic.m4a',
+  './media/turtvox006_propeller_strike_fatal_wound.m4a',
+  './media/water_sfx_001.m4a',
+  './media/water_sfx_002.m4a',
+  './media/water_sfx_003.m4a'
 ];
 
 self.addEventListener('install', (e) => {