chore: use yarn (fleet standard) + declare vite devDependency

- Switch package manager from npm to yarn 1.22.22 (pinned via packageManager,
  matches PressV/sp-ui-kit): remove package-lock.json, add yarn.lock (v1).
- Add "vite" as an explicit devDependency. npm 7+ auto-installed it as a peer of
  @vitejs/plugin-vue / @tailwindcss/vite, which masked the missing declaration; a
  clean `yarn install` (no peer auto-install) needs it explicit or the tsc build
  fails to resolve 'vite' / 'vite/client'.
- README: npm -> yarn (+ `corepack enable`).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

README.md

@@ -19,18 +19,25 @@ scopes only the "Fertig" figures. Run `npm run dev` to see it.
 
 ## Quick start (standalone dev)
 
+Package manager is **yarn 1.22.22** (pinned via `packageManager`; matches PressV /
+the fleet). `corepack` provides it — no global yarn install needed.
+
 ```bash
+# 0) let corepack honour the pinned yarn (one-time per machine)
+corepack enable
+
 # 1) auth for the private @sp-ui-kit design-token package (one-time)
 cp .npmrc.example .npmrc      # then paste a Gitea PAT with "package: Read" scope
+                              # (yarn v1 reads .npmrc for the scoped registry)
 
 # 2) install + run
-npm install
-npm run dev                   # http://localhost:5173/module/temper_overview/
+yarn install
+yarn dev                      # http://localhost:5173/module/temper_overview/
 ```
 
 With **no gateway backend running**, the store falls back to **bundled sample data**
-(`src/data/sample.ts`), so `npm run dev` shows the full design immediately (a
-`DEMO-DATEN` tag appears in the header). `npm run build` → `dist/` (committed).
+(`src/data/sample.ts`), so `yarn dev` shows the full design immediately (a
+`DEMO-DATEN` tag appears in the header). `yarn build` → `dist/` (committed).
 
 ---
 
@@ -65,9 +72,8 @@ Restart the gateway; the log shows `loaded module: temper_overview`. Smoke-test
 (mind the trailing slash): `http://localhost:8800/module/temper_overview/` and
 `…/api/overview`.
 
-> **Deploy rule:** always `npm run build` and **commit `dist/`** when the app
-> changes, then bump the submodule pin in the gateway repo. Never build on the
-> gateway host.
+> **Deploy rule:** always `yarn build` and **commit `dist/`** when the app changes,
+> then bump the submodule pin in the gateway repo. Never build on the gateway host.
 
 ---
 

package.json

@@ -3,6 +3,7 @@
   "private": true,
   "version": "0.1.0",
   "type": "module",
+  "packageManager": "yarn@1.22.22",
   "description": "Temper-Linie · Live-Übersicht — a login-free whole-line temper overview SPA, served by the SPRO gateway under /module/temper_overview and embedded into Grafana via iframe.",
   "scripts": {
     "dev": "vite",
@@ -29,6 +30,7 @@
     "@vue/tsconfig": "^0.9.0",
     "tailwindcss": "^4.2.2",
     "typescript": "~5.9.3",
+    "vite": "^8.0.1",
     "vue-tsc": "^3.2.5"
   }
 }