refactor(electron): use mp4 container instead of webm for encoded audio (#12247)

fix AF-2609
webm container with opus has limited support on Safari. Change to mp4 instead.

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->

## Summary by CodeRabbit

- **New Features**
  - Audio recordings are now saved in MP4 format instead of WebM, improving compatibility with a wider range of devices and applications.

- **Chores**
  - Updated dependencies to use MP4 muxing tools in place of WebM.
  - Internal audio encoding utilities and references updated to support MP4 container format.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

yarn.lock

@@ -459,6 +459,7 @@ __metadata:
     lit: "npm:^3.2.1"
     lodash-es: "npm:^4.17.21"
     lottie-react: "npm:^2.4.0"
+    mp4-muxer: "npm:^5.2.1"
     nanoid: "npm:^5.0.9"
     next-themes: "npm:^0.4.4"
     query-string: "npm:^9.1.1"
@@ -474,7 +475,6 @@ __metadata:
     swr: "npm:2.3.3"
     tinykeys: "patch:tinykeys@npm%3A2.1.0#~/.yarn/patches/tinykeys-npm-2.1.0-819feeaed0.patch"
     vitest: "npm:3.1.3"
-    webm-muxer: "npm:^5.1.0"
     y-protocols: "npm:^1.0.6"
     yjs: "npm:^13.6.21"
     zod: "npm:^3.24.1"
@@ -14916,7 +14916,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@types/dom-webcodecs@npm:^0.1.4":
+"@types/dom-webcodecs@npm:^0.1.4, @types/dom-webcodecs@npm:^0.1.6":
   version: 0.1.15
   resolution: "@types/dom-webcodecs@npm:0.1.15"
   checksum: 10/0d1ce12007803b92594968c657e3bcdb24c5f4b7b89a3b094670bcc39f5c3b395adba1ab64a930007bd947ae6be1689ddd64ccc48127d1acf3ef7be63f3cdc98
@@ -26932,6 +26932,16 @@ __metadata:
   languageName: node
   linkType: hard
 
+"mp4-muxer@npm:^5.2.1":
+  version: 5.2.1
+  resolution: "mp4-muxer@npm:5.2.1"
+  dependencies:
+    "@types/dom-webcodecs": "npm:^0.1.6"
+    "@types/wicg-file-system-access": "npm:^2020.9.5"
+  checksum: 10/7169fd43e4a3a604c4590970276ff58bee479444530af8455ba66b70207e3317e74ae662b488df58f4619dd29973950228347585ec579539aa4356ead9d203be
+  languageName: node
+  linkType: hard
+
 "mri@npm:^1.2.0":
   version: 1.2.0
   resolution: "mri@npm:1.2.0"
@@ -34136,7 +34146,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"webm-muxer@npm:^5.0.3, webm-muxer@npm:^5.1.0":
+"webm-muxer@npm:^5.0.3":
   version: 5.1.2
   resolution: "webm-muxer@npm:5.1.2"
   dependencies: