Add receipt extraction, manual crop, and UX improvements

- Add Claude Haiku vision integration to extract amount and date from
  receipt photos, re-reading on photo replacement
- Add manual crop overlay with draggable handles for receipt photos
- Open camera directly when tapping + to add new receipt
- Make add/edit modal scrollable on small screens
- Show "Tap to change photo" hint on uploaded photos
- Include api-key in Docker image for Anthropic API access

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Dockerfile

@@ -5,7 +5,7 @@ WORKDIR /app
 COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
 
-COPY server.py receipts.html ./
+COPY server.py receipts.html api-key ./
 
 EXPOSE 8080