refactor: update dependencies and remove unused code

- Added new dependencies: `adler2`, `crc32fast`, `flate2`, `miniz_oxide`, and `libredox`.
- Updated existing dependencies: `tokio-rustls` to version 0.26.4 and `filetime` to version 0.2.27.
- Removed the `backup.rs` file as it is no longer needed.
- Introduced tests for configuration and credential management.
- Enhanced the `identity` module to generate W3C compliant DID documents.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

neode-ui/src/composables/useLoginSounds.ts

@@ -93,7 +93,7 @@ export function stopSynthwave() {
   if (introAudio) {
     if (introGain && audioContext) {
       const t = audioContext.currentTime
-      introGain.gain.setValueAtTime(1, t)
+      introGain.gain.setValueAtTime(introGain.gain.value, t)
       introGain.gain.linearRampToValueAtTime(0.001, t + 0.2)
     }
     setTimeout(() => {
@@ -104,6 +104,23 @@ export function stopSynthwave() {
   }
 }
 
+/** Stop ALL login audio and close AudioContext. Call on route change to dashboard. */
+export function stopAllAudio() {
+  // Stop synthwave loop
+  if (introAudio) {
+    introAudio.pause()
+    introAudio = null
+    introGain = null
+  }
+  // Stop intro typing
+  stopIntroTyping()
+  // Close AudioContext to kill any lingering BufferSource nodes (playLoopStart)
+  if (audioContext) {
+    audioContext.close().catch(() => {})
+    audioContext = null
+  }
+}
+
 /** Pop sound - plays when intro initiator (tap to start) is pressed */
 export function playPop() {
   const audio = new Audio('/assets/audio/pop.mp3')