Implement professional-grade Gaussian-approximated blur effect with resolution independence and configurable quality for image effector system (#16571)

* Initial plan

* Implement blur effect for image effector system

Co-authored-by: syuilo <4439005+syuilo@users.noreply.github.com>

* Improve blur quality with configurable sample count

Co-authored-by: syuilo <4439005+syuilo@users.noreply.github.com>

* Revert to simpler blur implementation with configurable sample count

Co-authored-by: syuilo <4439005+syuilo@users.noreply.github.com>

* Fix blur size independence from sample count

Co-authored-by: syuilo <4439005+syuilo@users.noreply.github.com>

* Make blur radius resolution-independent

Co-authored-by: syuilo <4439005+syuilo@users.noreply.github.com>

* Update blur.ts

* Enhance blur quality with explicit diagonal sampling and fix parameter configuration

Co-authored-by: syuilo <4439005+syuilo@users.noreply.github.com>

* Implement Gaussian-approximated blur with distance-based weighting for superior quality

Co-authored-by: syuilo <4439005+syuilo@users.noreply.github.com>

* Revert "Implement Gaussian-approximated blur with distance-based weighting for superior quality"

This reverts commit c739e9f55b.

* Revert "Enhance blur quality with explicit diagonal sampling and fix parameter configuration"

This reverts commit ffbc6eeba7.

* wip

* tweak

* ellipse

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: syuilo <4439005+syuilo@users.noreply.github.com>

locales/en-US.yml

@@ -3194,6 +3194,7 @@ _imageEffector:
     mirror: "Mirror"
     invert: "Invert Colors"
     grayscale: "Grayscale"
+    blur: "Blur"
     colorAdjust: "Color Correction"
     colorClamp: "Color Compression"
     colorClampAdvanced: "Color Compression (Advanced)"
@@ -3209,6 +3210,8 @@ _imageEffector:
     angle: "Angle"
     scale: "Size"
     size: "Size"
+    radius: "Radius"
+    samples: "Samples"
     color: "Color"
     opacity: "Opacity"
     normalize: "Normalize"