Add Void Linux packaging; fix production builds embedding the frontend

Voiced now ships as a native Void Linux package:
- packaging/void/template: xbps-src template
- packaging/void/build-xbps.sh: builds and indexes a local .xbps repository
- packaging/void/voiced.desktop: application entry

Also fixes a real bug: the `custom-protocol` feature was never enabled, so
releases ran in development mode and tried to reach a dev server on
localhost:1420 instead of serving the embedded frontend. It is now declared
in Cargo.toml and passed explicitly by every build script.

The Void package output moved out of Vite's `dist/` (which is wiped on each
build) to `build/void/`.

Co-authored-by: CommandCodeBot <noreply@commandcode.ai>

packaging/void/template

@@ -0,0 +1,54 @@
+# Template file for 'voiced'
+#
+# Canonical Void Linux package definition, to be built with xbps-src from a
+# void-packages checkout:
+#
+#   cp -r packaging/void/template void-packages/srcpkgs/voiced/template
+#   cd void-packages && ./xbps-src pkg voiced
+#
+# Notes:
+#  * `distfiles` points at a tagged archive of the (private) source repository.
+#    Private repositories require credentials, so either publish a release
+#    tarball, mirror it, or drop the sources into the xbps-src masterdir.
+#  * `checksum=SKIP` avoids pinning a hash that cannot be computed here; replace
+#    it with the real sha256 once the tarball is published.
+#  * If the build machine is offline, pre-populate the npm cache and Cargo
+#    registry in the masterdir before building.
+#
+pkgname=voiced
+version=0.1.0
+revision=1
+archs="x86_64*"
+hostmakedepends="rust nodejs pkg-config"
+makedepends="libwebkit2gtk41-devel libsoup3-devel gtk+3-devel librsvg-devel openssl-devel"
+depends="libwebkit2gtk41"
+short_desc="Offline invoicing app by Bongbetic"
+maintainer="Xavier Karma <xavier@bongbetic.com>"
+license="custom:proprietary"
+homepage="https://git.bongbetic.com/xavierk/Voiced"
+distfiles="https://git.bongbetic.com/xavierk/Voiced/archive/v${version}.tar.gz"
+checksum=SKIP
+compression="zstd"
+
+do_build() {
+    npm install --include=dev --no-audit --no-fund
+    npm run build
+    cd src-tauri
+    # `custom-protocol` embeds the frontend for production; without it the app
+    # expects a dev server on localhost:1420.
+    cargo build --release --features custom-protocol
+}
+
+do_install() {
+    vbin "${wrksrc}/src-tauri/target/release/voiced"
+    vinstall "${wrksrc}/packaging/void/voiced.desktop" 644 usr/share/applications
+    for size in 32 64 128; do
+        vinstall "${wrksrc}/src-tauri/icons/${size}x${size}.png" 644 \
+            "usr/share/icons/hicolor/${size}x${size}/apps" voiced.png
+    done
+    vinstall "${wrksrc}/src-tauri/icons/128x128@2x.png" 644 \
+        usr/share/icons/hicolor/256x256/apps voiced.png
+    vinstall "${wrksrc}/src-tauri/icons/icon.png" 644 \
+        usr/share/icons/hicolor/512x512/apps voiced.png
+    vdoc "${wrksrc}/README.md"
+}