Add Obsidian Leaflet plugin to BoM vault

Introduce a Nix derivation for the Obsidian Leaflet plugin and
configure the BoM vault to load it as a community plugin.

modules/home/obsidian/plugins/obsidian-leaflet.nix

@@ -0,0 +1,16 @@
+{pkgs, ...}:
+pkgs.stdenv.mkDerivation rec {
+  pname = "obsidian-leaflet";
+  version = "6.0.5";
+
+  src = pkgs.fetchzip {
+    url = "https://github.com/javalent/${pname}/releases/download/${version}/${pname}-${version}.zip";
+    hash = "sha256-RBogsPElRdZQD9UvwdxfB2X1gN5UY1VmbyYkK07GLFg=";
+  };
+
+  installPhase = ''
+    mkdir -p $out
+    cp main.js manifest.json $out/
+    cp styles.css $out/ 2>/dev/null || true
+  '';
+}

modules/home/obsidian/vaults/BoM.nix

@@ -1,4 +1,5 @@
 {
+  pkgs,
   lib,
   config,
   ...
@@ -8,5 +9,13 @@
   config.programs.obsidian.vaults."BoM" = lib.mkIf config.obsidian.vaults."BoM".enable {
     enable = true;
     target = "Obsidian/BoM";
+    settings.communityPlugins = [
+      {
+        enable = true;
+        pkg = pkgs.callPackage ../plugins/obsidian-leaflet.nix {};
+        # settings = {
+        # };
+      }
+    ];
   };
 }