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().

utils/weather_sat.py

@@ -797,6 +797,19 @@ class WeatherSatDecoder:
                 logger.error(f"Failed to delete image {filename}: {e}")
         return False
 
+    def delete_all_images(self) -> int:
+        """Delete all decoded images."""
+        count = 0
+        for ext in ('*.png', '*.jpg', '*.jpeg'):
+            for filepath in self._output_dir.glob(ext):
+                try:
+                    filepath.unlink()
+                    count += 1
+                except OSError:
+                    pass
+        self._images.clear()
+        return count
+
     def _emit_progress(self, progress: CaptureProgress) -> None:
         """Emit progress update to callback."""
         if self._callback: