🔴 Fix linting issues 🔴

[teolemon]

Story

🔴 Fix formatting issues 🔴 that make the build red

Checking formatting...
All matched files use Prettier code style!

/home/runner/work/openfoodfacts-explorer/openfoodfacts-explorer/src/lib/knowledgepanels/Element.svelte
Error:   16:28  error  'size' is assigned a value but never used  @typescript-eslint/no-unused-vars

/home/runner/work/openfoodfacts-explorer/openfoodfacts-explorer/src/routes/+layout.svelte
  91:3  error  Buttons and links should either contain text or have an `aria-label` or `aria-labelledby` attribute
https://svelte.dev/e/a[11](https://github.com/openfoodfacts/openfoodfacts-explorer/actions/runs/13620468499/job/38069118049#step:7:12)y_consider_explicit_label(a11y_consider_explicit_label)  svelte/valid-compile

/home/runner/work/openfoodfacts-explorer/openfoodfacts-explorer/src/routes/+page.svelte
Error:   34:7   error  `{@html}` can lead to XSS attack  svelte/no-at-html-tags
Error:   42:24  error  '_' is defined but never used     @typescript-eslint/no-unused-vars

/home/runner/work/openfoodfacts-explorer/openfoodfacts-explorer/src/routes/products/search/+page.svelte
Error:   19:21  error  '_' is defined but never used  @typescript-eslint/no-unused-vars

/home/runner/work/openfoodfacts-explorer/openfoodfacts-explorer/src/routes/qr/+page.svelte
Error:   25:[12](https://github.com/openfoodfacts/openfoodfacts-explorer/actions/runs/13620468499/job/38069118049#step:7:13)  error  '_result' is defined but never used  @typescript-eslint/no-unused-vars

✖ 6 problems (6 errors, 0 warnings)

 ELIFECYCLE  Command failed with exit code 1.
Error: Process completed with exit code 1.

[KarruHarin]

@teolemon I am interested in this !