feat: ringtone selector with bundled sounds

- Add ringtone selector in Notifications settings
- Bundle 14 ringtone sounds as MP3
- Fix TypeScript build errors
- Add macOS CI workflow

Author: Valentin Dev

.github/workflows/build-macos.yml

@@ -0,0 +1,47 @@
+name: Build macOS DMG
+on:
+  workflow_dispatch:
+  push:
+    branches: [feature/ringtone-selector]
+    paths: [".github/workflows/build-macos.yml"]
+
+jobs:
+  build:
+    runs-on: macos-latest
+    timeout-minutes: 60
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "24.12.0"
+
+      - name: Enable corepack
+        run: corepack enable
+
+      - name: Install dependencies
+        run: pnpm install
+
+      - name: Build
+        run: pnpm build
+
+      - name: Build release (DMG)
+        run: pnpm build-release
+        env:
+          CSC_IDENTITY_AUTO_DISCOVERY: "false"
+
+      - name: Upload DMG
+        uses: actions/upload-artifact@v4
+        with:
+          name: session-desktop-macos
+          path: release/*.dmg
+          if-no-files-found: warn
+
+      - name: Upload all release artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: session-desktop-release
+          path: release/session-desktop*
+          if-no-files-found: warn