fix: use m3ta-home.paths.srcRoot for wallpapers (pure eval compatible)

modules/default.nix

@@ -5,17 +5,17 @@
 #
 # Individual modules declare their own options (mkEnableOption etc.)
 # and are activated by mkHome's import mechanism.
-inputs: let
+{
+  inputs,
+  selfPath,
+}: let
   lib = inputs.nixpkgs.lib;
-
-  # Collect all .nix files recursively from a directory
-  collectModules = dir:
-    builtins.filterSource (path: _type:
-      lib.hasSuffix ".nix" (builtins.baseNameOf path))
-    dir;
 in {
   default = {
     imports = [
+      # Paths — must be first, provides m3ta-home.paths.srcRoot
+      ./paths.nix
+
       # Profiles
       ./../profiles/base
       ./../profiles/contexts/desktop
@@ -29,5 +29,8 @@ in {
       ./../users/m3tam3re/identities/private.nix
       ./../users/m3tam3re/identities/work.nix
     ];
+
+    # Set the source root for asset path resolution
+    m3ta-home.paths.srcRoot = selfPath;
   };
 }

modules/paths.nix

@@ -0,0 +1,13 @@
+# modules/paths.nix — Provides m3ta-home source paths for pure evaluation mode.
+#
+# Relative paths with ../.. break in the Nix store during pure evaluation.
+# This module exposes the flake source root so other modules can reference
+# assets via config.m3ta-home.paths.srcRoot.
+{lib, ...}: {
+  options.m3ta-home.paths = {
+    srcRoot = lib.mkOption {
+      type = lib.types.path;
+      description = "Root path of the m3ta-home flake source (set by flake.nix).";
+    };
+  };
+}