docs: add image_filter option to yazi.md

docs/configuration/yazi.md

@@ -66,6 +66,16 @@ If you haven't created and used your own configuration file yet, please see [Con
 - max_width: Maximum preview width for images. Do a `yazi --clear-cache` to take effect after changing this.
 - max_height: Maximum preview height for images. Do a `yazi --clear-cache` to take effect after changing this.
 - cache_dir: The system cache directory is used by default, and the cached files will go away on a reboot automatically. If you want to make it more persistent, you can specify the cache directory manually as an absolute path.
+- image_filter: The filters used on image downscaling, available values:
+
+  - `"nearest"` - Nearest Neighbor
+  - `"triangle"` - Linear: Triangle
+  - `"catmull-rom"` - Catmull-Rom
+  - `"lanczos3"` - Lanczos with window 3
+
+  They are arranged in order from fast to slow, and from poor to good quality. Lanczos3 provides the highest quality but is also the slowest — it's 40 times slower than Nearest.
+  This means it requires a significant amount of CPU computation, so make sure you know what you're doing!
+
 - image_quality: Quality on pre-caching images, range 50-90. The larger value, the better image quality, but slower with more CPU consumption, and generates larger cache files that occupy more storage space.
 - sixel_fraction: Sixel is a very old image format that only supports 256 colors. For better image preview, Yazi trains a neural network for each image to find the most representative colors. This value determines the number of samples used during the training, range 10-20. A smaller value produces better results but is also slower.