build: Add automated dependency management for JavaScript libraries

- Sets up Dependabot for JS dependency updates
- Adds GitHub workflow for automated static dependency updates
- Creates update script for Preact and other static JS libraries
- Updates Preact to latest version via new automation

.github/dependabot.yml

@@ -98,3 +98,25 @@ updates:
       - "dependencies"
       - "docker"
     rebase-strategy: "auto"
+
+  # npm dependency updates
+  - package-ecosystem: "npm"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "thursday"
+      time: "09:00"
+      timezone: "UTC"
+    open-pull-requests-limit: 3
+    reviewers:
+      - "gesellix"
+    assignees:
+      - "gesellix"
+    commit-message:
+      prefix: "deps"
+      include: "scope"
+    labels:
+      - "dependencies"
+      - "npm"
+      - "frontend"
+    rebase-strategy: "auto"

.github/workflows/update-static-deps.yml

@@ -0,0 +1,50 @@
+name: Update Static Dependencies
+
+on:
+  pull_request:
+    paths:
+      - 'package.json'
+      - 'package-lock.json'
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+jobs:
+  update-deps:
+    runs-on: ubuntu-latest
+    if: github.actor == 'dependabot[bot]' || github.event_name == 'workflow_dispatch'
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          ref: ${{ github.head_ref }}
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Setup Node.js
+        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
+        with:
+          node-version: '24'
+          cache: 'npm'
+
+      - name: Update static dependencies
+        run: make update-static-deps
+
+      - name: Check for changes
+        id: git-check
+        run: |
+          git status --short pkg/service/soundtouchweb/static/lib/
+          if [ -n "$(git status --short pkg/service/soundtouchweb/static/lib/)" ]; then
+            echo "changed=true" >> $GITHUB_OUTPUT
+          else
+            echo "changed=false" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Commit and push changes
+        if: steps.git-check.outputs.changed == 'true'
+        run: |
+          git config --local user.email "github-actions[bot]@users.noreply.github.com"
+          git config --local user.name "github-actions[bot]"
+          git add pkg/service/soundtouchweb/static/lib/
+          git commit -m "chore: sync static dependencies with package.json"
+          git push