Fix flake: include .txt data files and assets/ for GUI build

flake.nix

@@ -48,12 +48,14 @@
 
         craneLib = (crane.mkLib pkgs).overrideToolchain rustToolchain;
 
-        # Source filtering — include Cargo sources and .slint UI files
+        # Source filtering — include Cargo sources, .slint UI files, and
+        # data files referenced by include_str!() / include_bytes!()
         rustSrc = pkgs.lib.cleanSourceWith {
           src = ./rust;
           filter = path: type:
             (craneLib.filterCargoSources path type)
-            || (builtins.match ".*\\.slint$" path != null);
+            || (builtins.match ".*\\.slint$" path != null)
+            || (builtins.match ".*\\.txt$" path != null);
         };
 
         # Common arguments shared across all builds
@@ -98,6 +100,13 @@
             pkgs.libGL
           ];
 
+          # Slint UI files reference ../../../assets/ (relative to gui-app/ui/).
+          # Place the repo's assets/ dir where that relative path resolves.
+          preBuild = ''
+            mkdir -p ../assets
+            cp -r ${./assets}/* ../assets/
+          '';
+
           # Slint needs to find wayland/X11 libs at runtime
           postFixup = pkgs.lib.optionalString pkgs.stdenv.isLinux ''
             patchelf --add-rpath ${pkgs.lib.makeLibraryPath [

result

@@ -0,0 +1 @@
+/nix/store/ml48kx0dl3jqiiqbqdwldgpck4x22cz5-synchronicity-0.1.0

result-gui

@@ -0,0 +1 @@
+/nix/store/h4q78cs0gvcknn1ijjb1d6735kq7wrsm-synchronicity-0.1.0

result-tui

@@ -0,0 +1 @@
+/nix/store/6bmgfsay5rhwygzy8bri5zk718hgnrkv-synchronicity-0.1.0