Bump `flake.lock` after dev-shell fixes

Advance `nixpkgs` to `241313f4`; the refreshed closure passes Qt,
`pyqtgraph` and wksmod-path import checks.

(this commit msg was generated in some part by `opencode` using `gpt-5.6-sol` (`openai`))

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1765779637,
+        "lastModified": 1784497964,
-        "narHash": "sha256-KJ2wa/BLSrTqDjbfyNx70ov/HdgNBCBBSQP3BIzKnv4=",
+        "narHash": "sha256-vlHUuqAcbcH2RKmHbPiuQzbv1pnzzavXnI62RD0bqCU=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "1306659b587dc277866c7b69eb97e5f07864d8c4",
+        "rev": "241313f4e8e508cb9b13278c2b0fa25b9ca27163",
         "type": "github"
       },
       "original": {

flake.nix

@@ -22,12 +22,14 @@
 
           # do store-path extractions
           qt6baseStorePath = lib.getLib pkgs.qt6.qtbase;
+          zlibStorePath = lib.getLib pkgs.zlib;
           # ?TODO? can remove below since manual linking not needed?
           # qt6QtWaylandStorePath = lib.getLib pkgs.qt6.qtwayland;
 
           # XXX NOTE XXX, for now we overlay specific pkgs via
           # a major-version-pinned-`cpython`
           cpython = "python313";
+          python = pkgs.${cpython};
           pypkgs = pkgs."${cpython}Packages";
         in
         {
@@ -46,7 +48,7 @@
               qt6.qtbase
 
               uv
-              python313  # ?TODO^ how to set from `cpython` above?
+              python
               pypkgs.pyqt6
               pypkgs.pyqt6-sip
               pypkgs.qtpy
@@ -70,6 +72,7 @@
 
               # link-in c++ stdlib for various AOT-ext-pkgs (numpy, etc.)
               LD_LIBRARY_PATH="${pkgs.stdenv.cc.cc.lib}/lib:$LD_LIBRARY_PATH"
+              LD_LIBRARY_PATH="${zlibStorePath}/lib:$LD_LIBRARY_PATH"
 
               export LD_LIBRARY_PATH
 
@@ -86,15 +89,31 @@
               export QT_WAYLAND_SHELL_INTEGRATION="xdg-shell"
 
               # ------ uv ------
+              # ignore any venv inherited from an outer checkout
+              unset VIRTUAL_ENV
               # - always use the ./py313/ venv-subdir
               export UV_PROJECT_ENVIRONMENT="py313"
+
+              # Rebuild after a flake update changes the Nix Python closure.
+              venv_python="$UV_PROJECT_ENVIRONMENT/bin/python"
+              nix_python="$(readlink -f "${python}/bin/python3")"
+              if test -e "$venv_python" \
+                && test "$(readlink -f "$venv_python")" != "$nix_python"
+              then
+                uv venv \
+                  --clear \
+                  --python "$nix_python" \
+                  "$UV_PROJECT_ENVIRONMENT"
+              fi
+
               # sync project-env with all extras
               uv sync --dev --all-extras --no-group lint
+              source "$UV_PROJECT_ENVIRONMENT/bin/activate"
 
               # ------ TIPS ------
               # NOTE, to launch the py-venv installed `xonsh` (like @goodboy)
               # run the `nix develop` cmd with,
-              # >> nix develop -c uv run xonsh
+              # >> nix develop -c xonsh
             '';
           };
         }