feat: add dynamic variant selector with color swatches

- Fix Printify options parsing (Color/Size were swapped)
- Add extract_option_types/1 for frontend display with hex colors
- Filter option types to only published variants (not full catalog)
- Track selected variant in LiveView with price updates
- Color swatches for color-type options, text buttons for size
- Disable unavailable combinations
- Add startup recovery for stale sync status

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

lib/simpleshop_theme/images/variant_cache.ex

@@ -35,11 +35,21 @@ defmodule SimpleshopTheme.Images.VariantCache do
     Logger.info("[VariantCache] Checking image variant cache...")
     File.mkdir_p!(Optimizer.cache_dir())
 
+    reset_stale_sync_status()
     ensure_database_image_variants()
     ensure_mockup_variants()
     ensure_product_image_downloads()
   end
 
+  # Reset any provider connections stuck in "syncing" status from interrupted syncs
+  defp reset_stale_sync_status do
+    {count, _} = Products.reset_stale_sync_status()
+
+    if count > 0 do
+      Logger.info("[VariantCache] Reset #{count} stale sync status(es) to idle")
+    end
+  end
+
   defp ensure_database_image_variants do
     incomplete =
       ImageSchema