fix(image-loader): update sanity image urls on input changes - #75

PR Checklist

Adds focused coverage and behavior fixes for SanityImage URL generation when inputs that affect the generated Sanity URL change.

Closes #

N/A

What is the new behavior?

• Exposes inherited ngSrc and loaderParams through directive metadata instead of subclass field redeclarations.
• Regenerates the synthetic ngSrc when sanityImage, loaderParams, quality, width, or height changes.
• Filters post-init static NgOptimizedImage input changes after synthesizing ngSrc, so the underlying optimized image directive receives the URL update without throwing for Sanity-specific recomputation.
• Adds unit tests for the directive input metadata, initial URL generation, Sanity image changes, loader params, quality changes, and dimension changes.

Does this PR introduce a breaking change?

• Yes
• No

Other information

Validation run:

corepack pnpm --filter @limitless-angular/sanity test
corepack pnpm --filter @limitless-angular/sanity build
corepack pnpm --filter @limitless-angular/sanity lint
git diff --check

This PR is stacked on osnoser1/angular-22-support so the Angular 22 migration branch can stay limited to the minimal compatibility workaround.

[Optional] What gif best describes this PR or how it makes you feel?

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