build: replace flake with npins, add Nix packages for web and desktop

- npins pins nixpkgs-unstable + Inter font tarball; shell.nix replaces the flake devshell
- nix/bun-deps.nix: fixed-output bun install of the workspace (hash tied to bun.lock)
- nix/web.nix: static Next.js export; next/font/google patched to local Inter for offline builds
- nix/desktop.nix: tsc-built Electron app embedding the web export, wrapped with nixpkgs electron; ffmpeg-static satisfied by nixpkgs ffmpeg

1 files changed, 64 insertions, 0 deletions

diff --git a/nix/web.nix b/nix/web.nix
new file mode 100644
index 00000000..eb464a2a
--- /dev/null
+++ b/nix/web.nix
@@ -0,0 +1,64 @@
+# Static export of the Next.js web app (apps/web/out).
+# Deps come from the bun-deps FOD; the Google-font fetch in next/font is
+# replaced by the npins-pinned Inter so the build runs offline.
+{
+  lib,
+  stdenvNoCC,
+  bun,
+  nodejs,
+  callPackage,
+  sources ? import ../npins,
+}:
+
+let
+  bunDeps = callPackage ./bun-deps.nix { };
+  webPkg = builtins.fromJSON (builtins.readFile ../apps/web/package.json);
+in
+stdenvNoCC.mkDerivation {
+  pname = "opencut-web";
+  version = webPkg.version;
+  src = lib.cleanSource ../.;
+
+  nativeBuildInputs = [
+    bun
+    nodejs
+  ];
+
+  postPatch = ''
+    mkdir -p apps/web/public/fonts
+    cp ${sources.inter}/web/InterVariable.woff2 apps/web/public/fonts/InterVariable.woff2
+    substituteInPlace apps/web/src/app/layout.tsx \
+      --replace-fail 'import { Inter } from "next/font/google";' 'import localFont from "next/font/local";' \
+      --replace-fail 'const siteFont = Inter({ subsets: ["latin"] });' 'const siteFont = localFont({ src: "../../public/fonts/InterVariable.woff2" });'
+  '';
+
+  configurePhase = ''
+    runHook preConfigure
+    cp -r ${bunDeps}/node_modules node_modules
+    cp -r ${bunDeps}/apps/web/node_modules apps/web/node_modules
+    chmod -R u+w node_modules apps/web/node_modules
+    patchShebangs node_modules apps/web/node_modules
+    runHook postConfigure
+  '';
+
+  buildPhase = ''
+    runHook preBuild
+    export HOME=$TMPDIR
+    export NEXT_TELEMETRY_DISABLED=1
+    export NODE_ENV=production
+    cd apps/web
+    bun run build
+    runHook postBuild
+  '';
+
+  installPhase = ''
+    runHook preInstall
+    cp -r out $out
+    runHook postInstall
+  '';
+
+  meta = {
+    description = "OpenCut web app (static export)";
+    license = lib.licenses.mit;
+  };
+}