chore: setup CI scripts (#6)

* wip: workflows

* wip: fix up issues in ci scripts and fix frontend lint errors

* wip: fix backend lints

* remove unused deps

* wip: build frontend in test.yml

* wip: attempt to improve Rust caching

* wip: testing release

* wip: linear release flow

* wip: check against both package.json versions

* wip: spurious attempt to get Rust caching

* wip: more cache

* merge release and publish jobs; add more caching to release flow

* decouple github releases and npm publishing

* update pack flow

---------

Co-authored-by: couscous <couscous@runner.com>

.github/actions/setup-node/action.yml

@@ -0,0 +1,29 @@
+name: 'Setup Node.js and pnpm'
+description: 'Sets up Node.js and pnpm with caching'
+
+runs:
+  using: 'composite'
+  steps:
+    - name: Setup Node.js
+      uses: actions/setup-node@v4
+      with:
+        node-version: ${{ env.NODE_VERSION }}
+        registry-url: 'https://registry.npmjs.org'
+
+    - name: Setup pnpm
+      uses: pnpm/action-setup@v4
+      with:
+        version: ${{ env.PNPM_VERSION }}
+
+    - name: Get pnpm store directory
+      shell: bash
+      run: |
+        echo "STORE_PATH=$(pnpm store path --silent)" >> $GITHUB_ENV
+
+    - name: Setup pnpm cache
+      uses: actions/cache@v4
+      with:
+        path: ${{ env.STORE_PATH }}
+        key: ${{ runner.os }}-pnpm-store-${{ hashFiles('**/pnpm-lock.yaml') }}
+        restore-keys: |
+          ${{ runner.os }}-pnpm-store-