feat: add release notes overlay with Markdown rendering

- Replace truncated plaintext release notes with full-screen overlay
  rendered via `marked` library
- Server reconnection does a hard page reload instead of custom event

.gitea/workflows/release.yml

@@ -12,6 +12,9 @@ jobs:
     outputs:
       release_id: ${{ steps.create.outputs.release_id }}
     steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
       - name: Create Gitea release
         id: create
         env:
@@ -30,12 +33,31 @@ jobs:
           REPO=$(echo "${{ gitea.repository }}" | tr '[:upper:]' '[:lower:]')
           DOCKER_IMAGE="${SERVER_HOST}/${REPO}"
 
+          # Scan for RELEASE_NOTES.md (check repo root first, then recursively)
+          NOTES_FILE=$(find . -maxdepth 3 -name "RELEASE_NOTES.md" -type f | head -1)
+          if [ -n "$NOTES_FILE" ]; then
+            export RELEASE_NOTES=$(cat "$NOTES_FILE")
+            echo "Found release notes: $NOTES_FILE"
+          else
+            export RELEASE_NOTES=""
+            echo "No RELEASE_NOTES.md found"
+          fi
+
           # Build release body via Python to avoid YAML escaping issues
           BODY_JSON=$(python3 -c "
-          import json, sys
+          import json, sys, os, textwrap
+
           tag = '$TAG'
           image = '$DOCKER_IMAGE'
-          body = f'''## Downloads
+          release_notes = os.environ.get('RELEASE_NOTES', '')
+
+          sections = []
+
+          if release_notes.strip():
+              sections.append(release_notes.strip())
+
+          sections.append(textwrap.dedent(f'''
+          ## Downloads
 
           | Platform | File | Description |
           |----------|------|-------------|
@@ -58,9 +80,9 @@ jobs:
           1. Change the default API key in config/default_config.yaml
           2. Open http://localhost:8080 and discover your WLED devices
           3. See INSTALLATION.md for detailed configuration
-          '''
-          import textwrap
-          print(json.dumps(textwrap.dedent(body).strip()))
+          ''').strip())
+
+          print(json.dumps('\n\n'.join(sections)))
           ")
 
           RELEASE=$(curl -s -X POST "$BASE_URL/releases" \