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, 18 insertions, 0 deletions

diff --git a/npins/sources.json b/npins/sources.json
new file mode 100644
index 00000000..f4ed4417
--- /dev/null
+++ b/npins/sources.json
@@ -0,0 +1,18 @@
+{
+  "pins": {
+    "inter": {
+      "type": "Url",
+      "url": "https://github.com/rsms/inter/releases/download/v4.1/Inter-4.1.zip",
+      "unpack": true,
+      "hash": "sha256-5vdKKvHAeZi6igrfpbOdhZlDX2/5+UvzlnCQV6DdqoQ="
+    },
+    "nixpkgs": {
+      "type": "Channel",
+      "name": "nixpkgs-unstable",
+      "artifact": "nixexprs.tar.xz",
+      "url": "https://releases.nixos.org/nixpkgs/nixpkgs-26.11pre1043539.9bc02893134c/nixexprs.tar.xz",
+      "hash": "sha256-PlAXr9kpfXhMFU0OQ7qtE8FhLQo21WXFVGqIC85UFyc="
+    }
+  },
+  "version": 8
+}