feat(dashboard): add setup/assets aliases and bundle assets on hex publish

mix setup        - deps.get + pnpm install (assets.setup)
mix assets.build - vite build into priv/static
hex.build/publish runs assets.build first so the tarball ships fresh,
production-built JS/CSS to consumers.

Author: kasvith

durable_dashboard/mix.exs

@@ -11,6 +11,7 @@ defmodule DurableDashboard.MixProject do
       elixir: "~> 1.15",
       elixirc_paths: elixirc_paths(Mix.env()),
       start_permanent: Mix.env() == :prod,
+      aliases: aliases(),
       deps: deps(),
       name: "DurableDashboard",
       description: "Web dashboard for Durable workflow engine",
@@ -38,6 +39,16 @@ defmodule DurableDashboard.MixProject do
     ]
   end
 
+  defp aliases do
+    [
+      setup: ["deps.get", "assets.setup"],
+      "assets.setup": ["cmd --cd assets pnpm install"],
+      "assets.build": ["cmd --cd assets pnpm build"],
+      "hex.build": ["assets.build", "hex.build"],
+      "hex.publish": ["assets.build", "hex.publish"]
+    ]
+  end
+
   defp package do
     [
       licenses: ["MIT"],