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, 0 insertions, 41 deletions

diff --git a/ui/package.json b/ui/package.json
deleted file mode 100644
index 943fddc..0000000
--- a/ui/package.json
+++ /dev/null
@@ -1,41 +0,0 @@
-{
-  "name": "@dropout/ui",
-  "version": "0.2.0-alpha.1",
-  "private": true,
-  "type": "module",
-  "scripts": {
-    "dev": "vite",
-    "build": "vite build",
-    "preview": "vite preview",
-    "check": "svelte-check --tsconfig ./tsconfig.app.json && tsc -p tsconfig.node.json",
-    "lint": "oxlint .",
-    "lint:fix": "oxlint . --fix",
-    "format": "oxfmt . --write"
-  },
-  "dependencies": {
-    "@tauri-apps/api": "^2.9.1",
-    "@tauri-apps/plugin-dialog": "^2.6.0",
-    "@tauri-apps/plugin-fs": "^2.4.5",
-    "@tauri-apps/plugin-shell": "^2.3.4",
-    "lucide-svelte": "^0.562.0",
-    "marked": "^17.0.1",
-    "node-emoji": "^2.2.0",
-    "prismjs": "^1.30.0"
-  },
-  "devDependencies": {
-    "@sveltejs/vite-plugin-svelte": "^6.2.1",
-    "@tailwindcss/vite": "^4.1.18",
-    "@tsconfig/svelte": "^5.0.6",
-    "@types/node": "^24.10.1",
-    "@types/prismjs": "^1.26.5",
-    "autoprefixer": "^10.4.23",
-    "oxfmt": "^0.24.0",
-    "oxlint": "^1.39.0",
-    "postcss": "^8.5.6",
-    "svelte": "^5.46.4",
-    "svelte-check": "^4.3.4",
-    "tailwindcss": "^4.1.18",
-    "typescript": "~5.9.3",
-    "vite": "npm:rolldown-vite@7.2.5"
-  }
-}