chore(ui): refactor workspace to monorepo (#70)

## Summary by Sourcery

Refactor the UI project structure into a pnpm monorepo packages layout
and align tooling and automation with the new paths.

Enhancements:
- Reorganize the UI app from the root ui directory into packages/ui
within a pnpm workspace.
- Update pnpm workspace configuration to include all packages under
packages/*.
- Adjust paths in changeset configuration so the @dropout/ui package
resolves from packages/ui.

Build:
- Update pre-commit configuration paths and arguments to reflect the new
UI location and normalize hook argument formatting.
- Update Dependabot configuration so npm updates target /packages/ui
instead of /ui.

CI:
- Update GitHub Actions workflows to watch packages/** instead of ui/**
and to run frontend tasks from packages/ui.
- Update pnpm cache dependency paths in workflows to use the root
pnpm-lock.yaml.
- Simplify frontend install steps in test workflows to run from the
repository root.

Chores:
- Add a new index.html under packages/ui and remove the old
ui/index.html to match the new project layout.

1 files changed, 26 insertions, 0 deletions

diff --git a/packages/ui/vite.config.ts b/packages/ui/vite.config.ts
new file mode 100644
index 0000000..32610e2
--- /dev/null
+++ b/packages/ui/vite.config.ts
@@ -0,0 +1,26 @@
+import { defineConfig } from "vite";
+import { svelte } from "@sveltejs/vite-plugin-svelte";
+import tailwindcss from "@tailwindcss/vite";
+
+// https://vite.dev/config/
+export default defineConfig({
+  plugins: [tailwindcss(), svelte()],
+
+  // Fix for Tauri + Vite HMR
+  server: {
+    host: true,
+    strictPort: true,
+    hmr: {
+      protocol: "ws",
+      host: "localhost",
+      port: 5173,
+    },
+    watch: {
+      usePolling: true,
+    },
+  },
+
+  // Ensure compatibility with Tauri
+  clearScreen: false,
+  envPrefix: ["VITE_", "TAURI_"],
+});