feat: migrate from bun to vite-plus unified toolchain

Replace bun with pnpm via vite-plus (vp), consolidate oxlint/oxfmt
config into vite.config.ts, update CI workflow to use setup-vp,
and switch imports to vite-plus module paths.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: venables

.github/actions/setup/action.yml

@@ -0,0 +1,23 @@
+name: Check
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  check:
+    name: Check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: voidzero-dev/setup-vp@v1
+        with:
+          node-version: "24"
+          cache: true
+      - run: pnpm install --frozen-lockfile
+      - run: pnpm run check
+      - run: pnpm test

.github/workflows/check.yml

@@ -0,0 +1 @@
+vp staged

.github/workflows/deploy.yml

@@ -1,3 +1,7 @@
 {
-  "recommendations": ["oxc.oxc-vscode", "bradlc.vscode-tailwindcss"]
+  "recommendations": [
+    "oxc.oxc-vscode",
+    "bradlc.vscode-tailwindcss",
+    "VoidZero.vite-plus-extension-pack"
+  ]
 }

.github/workflows/preview.yml

@@ -17,5 +17,7 @@
     "**/routeTree.gen.ts": true
   },
   "typescript.tsdk": "node_modules/typescript/lib",
-  "typescript.updateImportsOnFileMove.enabled": "always"
+  "typescript.updateImportsOnFileMove.enabled": "always",
+  "oxc.fmt.configPath": "./vite.config.ts",
+  "editor.formatOnSaveMode": "file"
 }