chore(🐙): add image blur example

[huytdps13400]

Summary

• port the official WebGPU image-blur sample into the React Native example app
• add interactive kernel-size and pass-count controls
• render only on setup or settings changes and destroy GPU buffers/textures on unmount
• register the example in the typed route and home list
• cover dispatch planning, validation, and pass ordering

Closes #84.

Verification

• yarn workspace Example jest src/ImageBlur/__tests__/blurPlan.test.ts --runInBand — 2/2 passed
• yarn tsc — 3/3 workspaces passed
• targeted Example ESLint — passed with zero warnings
• yarn workspace react-native-webgpu test:node Blur.spec.ts — rendered and matched
• Metro iOS bundle — completed and copied all 27 assets
• git diff --check