tweaks

1. utils/weather_sat.py — Added delete_all_images() method that globs for *.png, *.jpg, *.jpeg in the output dir, unlinks each, clears _images list, and returns the
  count.
  2. routes/weather_sat.py — Added DELETE /weather-sat/images route that calls decoder.delete_all_images() and returns {'status': 'ok', 'deleted': count}.
  3. static/js/modes/weather-satellite.js:
    - Added currentModalFilename state variable
    - renderGallery() now sorts images by timestamp descending, groups by date using toLocaleDateString(), renders date headers spanning the grid, and adds a delete
  overlay button on each card
    - showImage() accepts a filename param, stores it in currentModalFilename, and creates a modal toolbar with a delete button
    - Added deleteImage(filename) — confirm dialog → DELETE /weather-sat/images/{filename} → filter from array → re-render + close modal
    - Added deleteAllImages() — confirm dialog → DELETE /weather-sat/images → clear array → re-render
    - Exposed deleteImage, deleteAllImages, and _getModalFilename in public API
  4. static/css/modes/weather-satellite.css:
    - Added position: relative to .wxsat-image-card
    - .wxsat-image-actions — absolute top-right overlay, hidden by default, appears on card hover
    - .wxsat-image-actions button — dark background, turns red on hover
    - .wxsat-date-header — full-grid-width date separator with dimmed uppercase text
    - .wxsat-modal-toolbar — absolute top-left in modal for the delete button
    - .wxsat-modal-btn.delete — turns red on hover
    - .wxsat-gallery-clear-btn — subtle icon button, pushed right via margin-left: auto, turns red on hover
    - Updated .wxsat-gallery-header from justify-content: space-between to gap: 8px for proper 3-child layout
  5. templates/index.html — Added clear-all trash button with SVG icon in the gallery header, wired to WeatherSat.deleteAllImages().

routes/weather_sat.py

@@ -301,6 +301,18 @@ def delete_image(filename: str):
         return jsonify({'status': 'error', 'message': 'Image not found'}), 404
 
 
+@weather_sat_bp.route('/images', methods=['DELETE'])
+def delete_all_images():
+    """Delete all decoded weather satellite images.
+
+    Returns:
+        JSON with count of deleted images.
+    """
+    decoder = get_weather_sat_decoder()
+    count = decoder.delete_all_images()
+    return jsonify({'status': 'ok', 'deleted': count})
+
+
 @weather_sat_bp.route('/stream')
 def stream_progress():
     """SSE stream of capture/decode progress.