Rewrite as browser-based web application

  Convert Python CLI tool to client-side web app using CREngine WASM.

  - EPUB to XTC/XTCH converter with live preview
  - EPUB optimizer for e-ink readers
  - Batch processing with ZIP export
  - Google Fonts integration + custom font upload
  - Device presets, orientation, text/image settings
  - Configurable progress bar
  - Floyd-Steinberg dithering via Web Worker
  - GitHub Pages deployment

Author: bigbag

.coverage

@@ -0,0 +1,38 @@
+name: Deploy to GitHub Pages
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: "pages"
+  cancel-in-progress: true
+
+jobs:
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Pages
+        uses: actions/configure-pages@v4
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: 'web'
+
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

.github/workflows/deploy.yml

@@ -1,18 +1,21 @@
-# Python-generated files
-__pycache__/
-*.py[oc]
-build/
-dist/
-wheels/
-*.egg-info
-
-.venv
-.pio
-.idea
+# OS files
 .DS_Store
-.vscode
+Thumbs.db
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# Claude
+.claude/
 CLAUDE.md
 
-# Font files (keep directory structure with .gitkeep)
-fonts/*
-!fonts/.gitkeep
+# Test files
+*.epub
+*.xtc
+*.xtch
+
+# Node modules (if any)
+node_modules/